JP2003239977A - Sliding member and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sliding member which endures high load, has reduced friction coefficient, hardly wears, radiates generated heat speedily because its thermal conductivity is excellent, and holds its performance for a long time, and also to provide a manufacturing method therefor. <P>SOLUTION: This sliding member is provided with a sliding member main body and a surface layer having a slide face in contact with a mate member. The sliding member main body is formed by a material guaranteeing mechanical strength of the whole sliding member and provided with heat resistance for heating temperature when forming the sliding member. The surface layer includes carbon nanotube substantially, and the material forming the sliding member main body is formed in a condition in which it enters between carbon nanotubes. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding member and a method for manufacturing the sliding member, which can withstand a high load and have a small friction coefficient.
The present invention relates to a sliding member that is less likely to be worn and has good thermal conductivity, so that generated heat can be quickly released and performance can be maintained for a long time, and a manufacturing method thereof.

[0002]

2. Description of the Related Art A sliding member such as a bearing is required to have various performances depending on its use condition. For example, a pump using a sliding bearing in which the bearing is immersed in the transfer liquid, such as a canned motor pump or a magnet drive pump, requires a bearing material having a high corrosion resistance against various chemical liquids.

For this reason, as the bearing material, graphite carbon and ceramics which are chemically stable and have lubricity are often used. Among these bearing materials, bearings that can withstand high loads are rubbed. Large coefficient and large mechanical loss. Further, a bearing manufactured by a method of sticking a sheet of fluororesin such as polytetrafluoroethylene (PTFE) to a load bearing member has a small strength at its joint portion, and its use is limited only to low load applications. There is.

As a sliding material, vapor-grown carbon fiber (VG
CF) or VGCF graphitized by heat treatment is mixed with a synthetic resin to obtain a sliding material.
Although disclosed in Japanese Patent Publication No. 38327/1998, this is only an improvement in abrasion resistance and is not sufficient for the corrosion resistance and load resistance required of the above sliding material.

A sliding member obtained by dispersing VGCF or VGCF which has been graphitized by heat treatment in a synthetic resin together with fine powder of molybdenum sulfide is disclosed in Japanese Unexamined Patent Publication (Kokai) No. 4-204.
Although proposed in Japanese Patent No. 11693, this is not suitable for use at high temperature because of the use of a synthetic resin, or in the presence of a corrosive fluid or under a high load condition, and further contains molybdenum sulfide. As a result, molybdenum is oxidized under the oxidation rich condition, and the friction coefficient may be increased.

Japanese Patent Laid-Open No. 5-59387 discloses a VGC.
A bearing material has been proposed in which F, molybdenum disulfide, graphite, PTFE or the like is mixed with a main material such as polyamide resin or polyimide resin to form a sliding material, which does not increase friction coefficient and reduces wear. In this case as well, the use conditions are limited as in the above case.

Further, the method of attaching a sheet-shaped sliding material or a thin-walled cylindrical sliding material as a pressure resistant sheet requires less sliding material, but has poor load resistance. On the contrary, the method of using a block processed sliding member for the whole is excellent in load resistance, but it is expensive, the heat release is poor, the temperature rises during use, and the oil film at high speed and high load May disappear, lubricity may deteriorate, and baking may occur.

[0008]

The present invention can withstand high loads, has a small coefficient of friction, is less likely to be worn, and has good thermal conductivity, so that the heat generated can be quickly released and the performance can be improved. It is an object of the present invention to provide a sliding member that can hold a long time and a method for manufacturing the sliding member.

[0009]

Means for achieving the above object is a sliding member provided with a sliding member main body and a surface layer having a sliding surface with which a mating member comes into contact. The moving member main body is made of a material that ensures the mechanical strength of the entire sliding member and has heat resistance to the heating temperature when forming the sliding member, and the surface layer is substantially made of carbon nanotubes. Is contained in the carbon nanotubes, and the material forming the sliding member main body is formed between the carbon nanotubes. A surface having a sliding surface with which a mating material comes into contact. A layer precursor, a surface layer precursor forming step of forming a surface layer precursor which is an aggregate of carbon nanotubes, and a powder which is not decomposed by a temperature for graphitizing the carbon nanotubes. A sliding member main body precursor forming step of forming a sliding member main body precursor by a powder capable of penetrating between carbon nanotubes in the aggregate, and the surface layer precursor on the surface of the sliding member main body precursor. A method for manufacturing a sliding member, comprising the step of pressurizing and heating the sliding member main body precursor and the surface layer precursor in an existing state to integrate the sliding member main body precursor and the surface layer precursor. By disposing the first mandrel at the center of the elastic mold, an annular first formed by the first elastic mold and the first mandrel.
The space is filled with a powder having heat resistance at the temperature when heating the carbon nanotubes, and the sliding member main body precursor is formed by pressing the powder to such an extent that the first elastic mold does not lose its shape. And a second mandrel having a diameter smaller than that of the first mandrel is disposed in the central portion of the first elastic mold instead of the first mandrel. A carbon nanotube is filled in an annular second space formed by the first elastic mold and the second mandrel, and the carbon nanotube is pressed to such an extent that the first elastic mold does not lose its shape to form a surface layer precursor. And a step of integrating the surface layer precursor and the sliding member body precursor by heating and pressing the surface layer precursor forming step. A method of manufacturing a member, comprising: inserting a mandrel into a central portion of a cylindrical second elastic mold to fill a carbon nanotube into an annular second space formed by the second elastic mold and the mandrel. A surface layer precursor forming step of forming a surface layer precursor by pressing the carbon nanotubes to such an extent that the carbon nanotubes are not deformed by the second elastic mold; and instead of the second elastic mold, the second elastic mold is used. A surface layer precursor formed around the mandrel is arranged at the center of a cylindrical first elastic mold having a diameter larger than that of the mold, and the surface layer precursor and the first resilience are disposed. A ring-shaped first space formed by a mold is filled with a powder having heat resistance at a temperature at which the carbon nanotube is heated, and the powder is pressed by the first elastic mold so that the mold is not deformed. A sliding member body precursor forming step of forming a sliding member body precursor by the above, and a step of integrating the sliding member body precursor and the surface layer precursor by heating under pressure. In the method for manufacturing the sliding member, characterized in that by inserting a mandrel into the central portion of the cylindrical elastic mold, in the annular second space formed by the elastic mold and the mandrel, For filling a carbon nanotube, pressurizing it, and then subjecting it to a graphitization heat treatment to form a surface layer precursor, a surface layer precursor forming step, and for sintering a cylindrical shape having a diameter larger than this elastic mold. By disposing the surface layer precursor in the center of the mold, sinterable powder is filled in the annular first space formed by the surface layer precursor and the sintering mold, Heat the body to form a sintered body of this powder A surface layer comprising the surface layer precursor and a sintered body portion formed of the powder infiltrated therein,
And a sintering step of forming a sliding member body made of a sintered body portion other than the infiltrated powder sintered body portion.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION 1. Sliding Member FIG. 1 shows a longitudinal sectional explanatory view of a bearing member 1 which is a specific example of the sliding member according to the present invention.

The bearing member 1 is a cylindrical member,
It has a sliding hole 2 through which a shaft, which is a mating member, can reciprocate.

The bearing member 1 includes a bearing body 3 forming an outer peripheral portion of the bearing member 1 and a surface layer 4 provided inside the bearing body 3 (this surface layer is distinguished from layers existing on other surfaces). May be referred to as an inner surface layer). The surface forming the sliding hole 2 in the surface layer 4 is the sliding surface 5.
And the surface that the shaft contacts.

The bearing body 3, which is a sliding member body, is formed of a material having heat resistance against the heating temperature when the bearing member 1 is formed. That is, the bearing body 3 is formed of a material that does not decompose or burn even in the heat isostatic pressing and the graphitization treatment that are performed when the bearing member 1 is formed. Therefore, the material used for the bearing main body 3 is appropriately selected according to the manufacturing method of the bearing member 1.

The bearing main body 3 is the same as the bearing member 1 except that
This is the part that guarantees the mechanical strength of the whole. For example, the load resistance required for the bearing member 1 is the bearing body 3
It is realized by. Therefore, the material used for the bearing body 3 needs to be a material that can realize such mechanical strength of the bearing body 3.

Examples of the material of the bearing body 3 which can satisfy the above conditions include graphite carbon, ceramics and metals.

The surface layer 4 substantially contains carbon nanotubes. The surface layer 4 comprises the material forming the bearing body 3 where it has penetrated between the carbon nanotubes. That is, the portion of the surface layer 4 where the material is infiltrated between the carbon nanotubes is a mixed layer of the carbon nanotubes and the material.

Since the surface layer 4 and the bearing body 3 are provided adjacent to each other, the portion of the surface layer 4 occupied by the material infiltrated between the carbon nanotubes is formed continuously with the bearing body 3. . That is, the bearing body 3 and the surface layer 4 of the bearing member 1 are adjacent to each other without having a clear interface.

The distribution state of the material infiltrated between the carbon nanotubes in the surface layer 4 is not particularly limited as long as the object of the present invention can be achieved. For example, the material is evenly distributed in the entire surface layer 4. The material may be distributed such that the density of the surface layer 4 gradually decreases from the bearing body 3 side toward the sliding hole 2 side.

Further, the material between the carbon nanotubes of the surface layer 4 does not need to be distributed over the entire carbon nanotube, and if it is continuously distributed from the bearing body 3, it is distributed up to the sliding surface 5. You don't have to. Therefore, in that case, the portion forming the sliding surface 5 in the surface layer 4 is formed only by the carbon nanotubes, and the surface layer 4 is formed by the mixed layer of the carbon nanotubes and the material and only the carbon nanotubes. It has a two-layer structure composed of layers. In this case, as a result, the bearing member 1 has a three-layer structure from the outer peripheral surface toward the inner peripheral surface, that is, the sliding surface 5, including a layer containing only the material, the mixed layer, and a layer containing only carbon nanotubes.

The carbon nanotube contained in the surface layer 4 is not particularly limited as long as the object of the present invention can be achieved, but its average diameter is 1 nm to 1 μm.
m, particularly 10 to 200 nm, and even if the aspect ratio is small, it is preferably 10 and particularly 10 to 200, more preferably 10 to 100. When the average diameter and the aspect ratio are within the above ranges, there is an advantage that preferable sliding characteristics are obtained in the bearing member 1 and the electric conduction characteristics and the heat conduction characteristics of the bearing member 1 are improved.

The carbon nanotube contained in the surface layer 4 is not particularly limited in its production method, and can be produced by, for example, a vapor phase growth method, that is, a substrate method or a fluidized vapor phase growth method.

As the carbon nanotube contained in the surface layer 4, a multi-wall carbon nanotube, that is, a carbon nanotube having a hollow ring structure is preferably used. Since the multi-walled carbon nanotube has excellent mechanical properties and chemical stability, it is suitable as the carbon nanotube contained in the surface layer 4.

The multi-walled carbon nanotube is manufactured, for example, by the following known method. A transition metal-containing compound such as an iron atom-containing compound containing an iron atom, a sulfur compound containing a sulfur atom, an organic compound that can serve as a carbon source such as hydrocarbon, and a raw material mixture obtained by mixing a carrier gas, 900-1,300 ℃ in the reaction tube
The multi-walled carbon nanotube can be manufactured by supplying to the reaction region maintained at the temperature of.

Since this multi-walled carbon nanotube has a so-called annual ring structure in which the graphite layer is hollow and the graphite layer is oriented parallel to the longitudinal direction of the fiber, it is excellent in electrical properties and mechanical properties (strength and elastic modulus, etc.) and is used as a composite material. There are many. The carbon nanotubes can be aligned to some extent in fiber orientation by molding while giving a strong shearing force. By aligning the orientation of the carbon nanotubes in this way, the load characteristics in the longitudinal direction may be improved.

When the transition metal fine particles in the multi-walled carbon nanotube have an adverse effect, the multi-walled carbon nanotube is immersed in an acid solution or exposed to a high temperature inert gas to evaporate the transition metal particles, It can also be removed.

The thickness of the bearing body 3 and the thickness of the surface layer 4 can be appropriately determined according to the purpose of use of the bearing member 1. The thickness of the surface layer 4 needs to be appropriately changed depending on the load applied to the bearing member 1 or the shaft diameter.

The bearing member 1 can be used in the same manner as a conventional bearing member.

The bearing member 1 operates as follows.
The bearing member 1 is made of graphite carbon, ceramics, metal, or the like, and has the bearing main body 3 that ensures the mechanical strength of the entire bearing member, and thus has excellent load resistance.

The bearing member 1 has a surface layer 4 forming a sliding surface 5, and the surface layer 4 contains carbon nanotubes. Carbon nanotubes have a low coefficient of friction. Therefore, even if the shaft of the bearing member 1 slides in the sliding hole 2, wear of the shaft and the like is small and the amount of heat generated is small, so that the occurrence of oil film breakage or burning due to overheating of the lubricant is suppressed. It In addition, carbon nanotubes have excellent thermal conductivity. Therefore, in the bearing member 1, the heat generated by the sliding of the shaft quickly moves from the sliding surface 5 toward the outer peripheral surface, so that the effect of preventing the occurrence of oil film breakage or burning is great.

The surface layer 4 comprises the material forming the bearing body 3 which has penetrated between the carbon nanotubes,
The bearing body 3 and the portion of the surface layer 4 occupied by the material are formed continuously. A bearing member formed by simply mounting a seal member on the main body cannot withstand a high load because the strength at the interface between the main body and the seal member is small. However, in the bearing member 1, as described above, Since the main body 3 and the surface layer 4 are integrally formed without having a clear interface, the reduction in strength at the interface does not substantially occur. Carbon nanotubes have a cylindrical structure in which a graphite sheet is rolled up,
The structure is such that delamination of the graphrite layer does not easily occur.
Therefore, since the bearing member 1 does not damage the surface layer even when a high load is applied, it can be used even when a high load is applied.

When the two members are in contact with each other with a clear interface, heat conduction is suppressed at the interface. In the bearing member 1, as described above, the bearing main body 3 and the surface layer 4 are integrally formed without having a clear interface, so that there is no suppression of heat conduction at such an interface and the heat conductivity is high. good. Therefore, in the bearing member 1, the heat generated by the sliding of the shaft smoothly moves from the surface layer 4 to the bearing main body 3, so that the effect of preventing the occurrence of oil film breakage or seizure or the like is further enhanced.

The shape and size of the sliding member according to the present invention are not limited to the shape and size of the bearing member 1, and the range in which the object of the present invention can be achieved. Can be appropriately determined within.

In the above description, the sliding member according to the present invention has been described by taking the bearing as an example, but the sliding member according to the present invention is not limited to the bearing. In the above description, the case where the shaft, which is the mating material, slides on the sliding member has been described as an example. However, in the present invention, the sliding member slides on the mating material and The material may be stationary, or both the sliding member and the mating material may slide relative to the other. For example, the sliding member according to the present invention may be a rail or a member that slides on the rail, and a member that slides on a plane by drawing a circular orbit, an elliptical orbit, an irregular orbit, or the like may be used. It may be a flat member in contact.

2. Method of Manufacturing Sliding Member A method of manufacturing the sliding member according to the present invention will be described below by taking the method of manufacturing the bearing member 1 as an example.

First, a first specific example of the method for manufacturing a sliding member according to the present invention (hereinafter referred to as "first manufacturing method") will be described.

An elastic mold 6 as shown in FIG. 2 is prepared.
The elastic mold 6 has a cylindrical portion 7 and a disc portion 8 provided at one end of the cylindrical portion 7. The disc portion 8 has a circular hole 9 in the center thereof.

A columnar first mandrel 10 which can be inserted into the circular hole 9 of the disk portion 8 is inserted into the circular hole 9 of the disk portion 8 and the first mandrel 10 is inserted into the internal space of the elastic die 6. The mandrel 10 is projected. As a result, the cylindrical first space 11 is formed in the elastic mold 6.

As shown in FIG. 3, the first space 11 is filled with the powder 12 which is the raw material of the bearing body 3. Powder 12
Is a powder that has heat resistance at the temperature when heating the carbon nanotubes, and is a powder that can ensure the mechanical strength required for the bearing body 3 when the bearing body is formed. is there. Examples of such powder include graphite carbon powder, ceramic powder, and metal powder.

As shown in FIG. 3, pressure is applied to the elastic mold 6 containing the powder 12, and the powder 12 in the first space 11 is pressure-compressed to agglomerate the powder 12 to such an extent that it does not lose its shape. . As a result, the bearing body precursor 13 that is the sliding member body precursor resistance of the present invention is formed as shown in FIG.

The first mandrel 10 is pulled out from the elastic mold 6.
Instead of this, as shown in FIG. 4, it has a large diameter portion 14 that can be inserted into the circular hole 9 and the same axis line as the large diameter portion 14, and the first mandrel 1
A small diameter portion 15 having a diameter smaller than 0
Prepare the mandrel 16. As shown in FIG. 4, the small-diameter portion 15 is located in the elastic mold 6, and the small-diameter portion 15 in the second mandrel 16 is provided.
It is inserted into the circular hole 9 so that the end surface provided with is flush with the inner surface of the disk portion 8 of the elastic mold 6. as a result,
A second space 17 is formed by the bearing body precursor 13 and the second mandrel 16.

As shown in FIG. 5, the second space 17 is filled with carbon nanotubes 18 or a sliding material containing the carbon nanotubes 18. The carbon nanotubes are as described in the explanation of the bearing member 1.

The elastic mold 6 is hermetically sealed so that liquid does not enter the elastic mold 6, and isotropically pressure-molded at room temperature into the elastic mold 6 containing the bearing main body precursor 13, the carbon nanotubes 18 and the like. Pressure is applied to compress the bearing body precursor 13 and the carbon nanotubes 18 in the elastic mold 6 under pressure. At this time, the bearing main body precursor 13 is compressed by the elastic mold 6, and the carbon nanotubes 18 and the like are compressed by the bearing main body precursor 13. Further, at this time, the bearing body precursor 13 is pressed against the carbon nanotubes 18 and the like, so that some particles of the bearing body precursor 13 penetrate between the carbon nanotubes 18 and the like. By this pressure compression, the carbon nanotubes 18 and the like and the bearing body precursor 1 that has penetrated between the carbon nanotubes 18 and the like
A part of the bearing body precursor 13 is a surface layer 4, and a part of the bearing body precursor 13 other than the portion that has penetrated between the carbon nanotubes 18 and the like serves as the bearing body 3. In this way, as shown in FIG. 6, the bearing member 1 is formed in the elastic mold 6.

After the pressure and compression are completed, the bearing member 1 is taken out of the elastic mold 6.

In the first manufacturing method, when the bearing main body precursor 13, the carbon nanotubes 18, etc. are pressed in the elastic mold 6, the surface layer precursor which does not lose its shape due to the pressurization of the carbon nanotubes 18 etc. It can be considered that the bearing body 1 is formed by forming the bearing body precursor 13 and then the bearing body precursor 13 and the surface layer precursor by pressure. Further, these pressure-molded bearing members 1 can be finally sintered at an appropriate temperature. This bearing member before sintering is the sliding member according to the present invention, but the sintered body obtained by sintering in this manner is also the sliding member according to the present invention. The sliding member before sintering is sometimes called “green”. For example, when graphite is used as the powder, this green can be sintered at 3000 ° C. in an Ar atmosphere.

Next, a second specific example of the method for manufacturing the sliding member according to the present invention (hereinafter referred to as "second manufacturing method") will be described.

A second elastic mold 19 as shown in FIG. 7 is prepared. The second elastic mold 19 has a cylindrical portion 20 and a disc portion 21 provided at one end of the cylindrical portion 20. The disc portion 21 has a circular hole 22 at the center thereof.

As shown in FIG. 7, the circular hole 22 of the disk portion 21
A cylindrical mandrel 23 that can be inserted into the circular hole 2 of the disk portion 21
2 and insert the mandrel 2 into the inner space of the second elastic mold 19.
3 is projected. As a result, a cylindrical second space 24 is formed in the second elastic mold 19.

As shown in FIG. 8, the carbon nanotube 18 or the sliding material containing the carbon nanotube 18 is filled in the second space 24. The carbon nanotube is as described above.

As shown in FIG. 8, the second elastic mold 19 accommodating the carbon nanotubes 18 and the like is pressurized to generate the second
The carbon nanotubes 18 and the like in the space 24 are isotropically pressure-molded, so that the carbon nanotubes 18 are not deformed.
Etc. are aggregated to form the surface layer precursor 25 shown in FIG. Mandrel 23 and surface layer precursor 25 pressed onto the mandrel 23
And are pulled out from the second elastic mold 19.

A first elastic mold 26 as shown in FIG. 10 is prepared. The first elastic mold 26 has a cylindrical portion 27 having a diameter larger than that of the cylindrical portion 20 (see FIG. 7), and a disc portion 28 provided at one end of the cylindrical portion 27. The disc portion 28 has a circular hole 29 into which the mandrel 23 can be inserted and inserted into the central portion thereof.
Have.

As shown in FIG. 10, the surface layer precursor 2 is positioned so that the surface layer precursor 25 is located in the first elastic mold 26.
The mandrel 23 to which 5 is crimped is inserted into the circular hole 29. As a result, the surface layer precursor 25 and the first elastic mold 26 form the first space 30.

As shown in FIG. 11, the first space 30 is filled with the powder 12 described in the first manufacturing method.

As shown in FIG. 11, for example, about 200.degree.
Surface layer precursor 25 and powder 1 in H ₂ or N ₂ atmosphere
Pressure is applied to the first elastic mold 26 containing 2 to compress the surface layer precursor 25 and the powder 12 in the first elastic mold 26 under pressure. At this time, the powder 12 is compressed by the first elastic mold 26, and the surface layer precursor 25 is compressed by the powder 12.
Further, at this time, the powder 12 is pressed against the surface layer precursor 25, so that the powder 12 penetrates into the carbon nanotubes 18 forming the surface layer precursor 25. Figure 1
As shown in FIG. 8, the portion of the carbon nanotubes 18 or the like and the powder 12 infiltrated between the carbon nanotubes 18 or the like becomes the bearing body 3 by this pressure compression, and the powder infiltrated between the carbon nanotubes 18 or the like. Body 1
The portion of the powder 12 other than 2 becomes the surface layer 4,
The bearing member 1 is formed in the elastic mold 26.

After the pressure and compression are completed, the bearing member 1 is taken out from the first elastic mold 26.

In the second manufacturing method, the first elastic mold 2 is used.
When pressurizing the surface layer precursor 25 and the powder 12 in 6,
When the powder 12 is pressurized, a bearing body precursor that does not lose its shape is once formed, and then the bearing body precursor and the surface layer precursor 25 are integrated by pressure to form the bearing member 1. You can also think of it.

The bearing member 1 obtained in the first manufacturing method and the second manufacturing method can be subjected to a graphitization heat treatment together with another graphite material in order to graphitize the carbon nanotubes contained therein. is there.

Next, a third specific example will be described as another method of manufacturing the sliding member according to the present invention.

In the second manufacturing method, as shown in FIGS. 7 to 9, after the carbon nanotubes are compressed under pressure,
Graphitization heat treatment is performed to form the surface layer precursor 32 shown in FIG.

As shown in FIG. 13, the surface layer precursor 32
Is placed in the center of a cylindrical mold 33 having an inner diameter larger than that of the surface layer precursor 32.

As shown in FIG. 14, the first space 34 formed by the surface layer precursor 32 and the mold 33 is filled with a sinterable powder, for example, a metal powder 35.

The die 33 is heated to a temperature at which the powder 35 is sintered. The powder 35 is sintered and integrated. Further powder 3
Part of 5 melts and penetrates between the graphitized carbon nanotubes forming the surface layer precursor 32.

When the mold 33 is cooled, the metal in the mold 33 solidifies. As described above, as shown in FIG. 15, the graphitized carbon nanotubes forming the surface layer precursor 32 and the portion of the metal infiltrated between the graphitized carbon nanotubes became the surface layer 37 and penetrated between the graphitized carbon nanotubes. A portion made of a metal other than the metal becomes the bearing main body 36. In this way, the bearing member 41 is formed in the mold 33.

The bearing member 41 is taken out from the first elastic mold 26.

When the sliding member is other than the bearing, the sliding member is manufactured based on the above-mentioned first manufacturing method, second manufacturing method or third manufacturing method, with appropriate modifications. be able to. That is, such a sliding member is an aggregate of carbon nanotubes, a surface layer precursor forming step of forming a surface layer precursor for forming a surface layer having a sliding surface with which a mating material contacts, the carbon nanotubes. And a sliding member body precursor forming step of forming a sliding member body precursor with powder that can be infiltrated between carbon nanotubes in an aggregate of carbon nanotubes without decomposing at a temperature for graphitizing Manufactured by a method in which the surface layer precursor is present on the surface of the body in a state of being pressurized and heated to be integrated, and a change is appropriately added depending on the shape and size of the sliding member. can do.

[0065]

Since the sliding member according to the present invention has the sliding member main body that ensures the mechanical strength of the entire sliding member,
Excellent load resistance.

In the sliding member according to the present invention, since the sliding surface is formed of carbon nanotubes having a small coefficient of friction and excellent thermal conductivity, the coefficient of friction is small, wear of the shaft and the like is small, and oil film breakage or It is possible to prevent the occurrence of burning or the like.

In the sliding member according to the present invention, since the sliding member main body and the surface layer are integrally formed without having a clear interface, they have excellent load resistance and good thermal conductivity.
The effect of preventing the occurrence of the oil film breakage or baking as described above is great.

According to the method of manufacturing the sliding member of the present invention, the sliding member can be manufactured efficiently, simply and at low cost.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of a bearing member 1 which is a specific example of a sliding member according to the present invention.

FIG. 2 is a longitudinal cross-sectional explanatory view showing a state where the first mandrel 10 is attached to the elastic mold 6.

FIG. 3 is a vertical cross-sectional explanatory view showing a state where the powder 12 is filled in the first space 11.

FIG. 4 is a longitudinal cross-sectional explanatory view showing a state in which a second mandrel 16 is attached to the elastic mold 6 containing the bearing body precursor 13.

FIG. 5 is a longitudinal cross-sectional explanatory view showing a state where the carbon nanotubes 18 are filled in the second space 17.

FIG. 6 is a vertical cross-sectional explanatory view showing the bearing member 1 formed in the elastic mold 6.

FIG. 7 is an explanatory longitudinal sectional view showing a state in which the mandrel 23 is mounted on the second elastic mold 19.

FIG. 8 is a vertical cross-sectional explanatory view showing a state where the carbon nanotubes 18 are filled in the second space 24.

9 is a vertical cross-sectional explanatory view showing a surface layer precursor 25 formed in the second elastic mold 19. FIG.

FIG. 10 is an explanatory longitudinal sectional view showing a state in which the mandrel 23 to which the surface layer precursor 25 is pressure bonded is mounted on the first elastic mold 26.

FIG. 11 is an explanatory longitudinal sectional view showing a state where the powder 12 is filled in the first space 30.

12 is a vertical cross-sectional explanatory view showing the bearing member 1 formed in the first elastic mold 26. FIG.

FIG. 13 is a vertical cross-sectional explanatory view showing a state in which the surface layer precursor 32 is arranged in the center of the mold 33.

FIG. 14 is an explanatory longitudinal sectional view showing a state in which the powder 35 is filled in the first space 34.

FIG. 15 is a vertical cross-sectional explanatory view showing a bearing member 41 formed in the mold 33.

[Explanation of symbols]

1 ... Bearing member, 2 ... Sliding hole, 3 ... Bearing body,
4 ・ ・ Surface layer, 5 ・ ・ Sliding surface, 6 ・ ・ Resilient type, 7 ・ ・
Cylindrical part, 8 ... Disc part, 9 ... Circular hole, 10 ... First mandrel, 11 ... First space, 12 ... Powder, 13 ... Bearing main body precursor, 14 ... Large diameter Part, 15 ... small diameter part, 16 ...
・ Second mandrel, 17 ・ ・ Second space, 18 ・ ・ Carbon nanotube, 19 ・ ・ Second elastic type, 20 ・ ・ Cylindrical part,
21 ·· Disc part, 22 · · Circular hole, 23 · · Mandrel, 24 ·
・ Second space, 25 ・ ・ Surface layer precursor, 26 ・ ・ First elastic type, 27 ・ ・ Cylindrical part, 28 ・ ・ Disc part, 29 ・ ・ Circular hole, 30 ・ ・ First space, 32 ..Surface layer precursor, 33 ..
・ Mould, 34 ・ ・ First space, 35 ・ ・ Powder, 36 ・ ・ Bearing body, 37 ・ ・ Surface layer, 41 ・ ・ Bearing member

Claims (5)

[Claims] 1. A sliding member comprising a sliding member main body and a surface layer having a sliding surface with which a mating member comes into contact, wherein the sliding member main body is provided with mechanical strength of the entire sliding member. A material that is formed of a material that ensures heat resistance to the heating temperature when forming this sliding member, and that the surface layer substantially contains carbon nanotubes and that forms the sliding member main body. Is formed so as to penetrate between the carbon nanotubes. 2. A surface layer precursor forming step of forming a surface layer precursor which is a precursor of a surface layer having a sliding surface in contact with a mating member, the surface layer precursor being an aggregate of carbon nanotubes; A sliding member body precursor forming step of forming a sliding member body precursor from a powder that does not decompose due to a temperature that changes and that can penetrate between carbon nanotubes in an aggregate of carbon nanotubes, and In the state where the surface layer precursor is present on the surface of the sliding member main body precursor, the method further comprises a step of pressurizing and heating the sliding member main body precursor and the surface layer precursor to integrate them. The method for manufacturing the sliding member according to claim 1. 3. The first elastic die and the first elastic die are arranged by disposing a first mandrel in a central portion of the cylindrical first elastic die.
Filling the annular first space formed by the mandrel with powder having heat resistance at the temperature when heating the carbon nanotubes, and pressing the powder to such an extent that the first elastic mold does not lose its shape. And a second mandrel having a diameter smaller than that of the first mandrel, in place of the first mandrel, at the center of the first elastic mold. By arranging the carbon nanotubes in the space, the annular second space formed by the first elastic mold and the second mandrel is filled with carbon nanotubes, and the carbon nanotubes are added to the extent that the first elastic mold does not lose its shape. A surface layer precursor forming step of forming a surface layer precursor by pressing, and a step of integrating the surface layer precursor and the sliding member body precursor by heating and pressing Method for producing a sliding member according to claim 1, characterized in that it comprises a. 4. A carbon nanotube is filled in the annular second space formed by the second elastic mold and the mandrel by inserting the mandrel into the central portion of the cylindrical second elastic mold, A surface layer precursor forming step of forming a surface layer precursor by pressing the carbon nanotubes to such an extent that the second elastic mold does not lose its shape; and instead of the second elastic mold, the second elastic mold is used. At the center of the first elastic mold with a large diameter,
When the surface layer precursor formed around the mandrel is arranged together with the mandrel, the carbon nanotube is heated in the annular first space formed by the surface layer precursor and the first elastic mold. A sliding member main body precursor forming step of forming a sliding member main body precursor by filling a powder having heat resistance at a temperature and pressing the powder to such an extent that the first elastic mold does not lose its shape; 2. The method for producing a sliding member according to claim 1, further comprising the step of integrating the sliding member main body precursor and the surface layer precursor by heating under pressure. 5. A carbon nanotube is filled into the annular second space formed by the elastic mold and the mandrel by inserting the mandrel into the central part of the cylindrical elastic mold, and the carbon nanotube is pressurized. , A surface layer precursor forming step of forming a surface layer precursor by subjecting this to a graphitization heat treatment, and the surface layer precursor at the center of a cylindrical sintering die having a diameter larger than that of the elastic die. By arranging, the sinterable powder is filled in the annular first space formed by the surface layer precursor and the sintering die, and the powder is heated to burn the powder. A surface layer comprising a surface layer precursor and a sintered body portion formed by the powder infiltrated into the surface layer precursor, and sintering of the infiltrated powder other than the sintered body portion. And a sintering step for producing a sliding member body composed of a body part Method for producing a sliding member according to claim 1, wherein the door.