KR20010018726A - method for manufacturing sintering metal fiber - Google Patents

Abstract

PURPOSE: A manufacturing method for a metal fiber sinter is provided to improve productivity by sintering fine metal fibers obtained by abrasion, which have improved sound absorption and filtering properties due to the fine size. CONSTITUTION: A manufacturing method for a metal fiber sinter includes the steps of forming metal fibers of a predetermined thickness of 10-100μm and length of 50-500μm by abrasing a metal(S1), removing impurities or abrasing oil generated in the process of the metal abrasion(S2), collecting the metal fibers from which the impurities or the abrasion oil is removed for molding the metal fibers into a predetermined shape(S3), sintering the molded metal fiber group at a temperature of 1000-1550°C to bind the metal fibers with each other with a porosity of 30-90% and a density of 0.7-6.0g/cc(S4), and pressing the sintered metal fiber group for making a surface flat(S5).

Description

Method for manufacturing sintering metal fiber

The present invention relates to a manufacturing method for producing a metal fiber sintered body, and more particularly, to a method for producing a metal fiber sintered body using a metal fiber obtained through a polishing method.

The metal fiber sintered body itself contains many pores and is used for various purposes. Since the metal fiber sintered body includes many pores therein, the metal fiber sintered body has many different characteristics from that of a general metal body.

If some of these characteristics are listed, it can be said that the noise absorption is very good compared to the general metal body, and the filtration ability is excellent even at high temperature. In addition, it is applied to an electrode and also for electromagnetic wave shielding.

By the way, various processes have been proposed as a method for producing a metal fiber sintered body, but such a process is very difficult. For example, a bundle drawing method is disclosed in which a plurality of metal wires are bundled together, drawn out, cut and formed to cut a metal fiber formed by a predetermined length, and then the cut metal fibers are collected and sintered to form a metal fiber sintered body. A mechanical method for producing a metal fiber sintered body by preparing and sintering a metal fiber by conventional turning has been proposed.

However, since the metal fiber produced by the bundle drawing method or the mechanical method as described above is large in size (typically in mm) and requires detailed processing, the sintered body produced by this method may be very expensive due to the complicated manufacturing process. There was no choice but to. In addition, since the size of the metal fiber constituting the structure is large, there is a problem that sound absorption or filtering ability is poor.

The present invention has been made to solve the above problems, to provide a method for producing a metal fiber sintered body that can be produced in large quantities at a low cost due to the large filtering capacity of the metal fiber is very small, and the manufacturing process is simple The purpose.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing a method of obtaining a metal fiber used in the metal fiber sintered body of the present invention using abrasive stone;

Figure 2 is a view showing a state in which the metal fiber of Figure 1 is contained in a molding die,

3 is a perspective view of a metal fiber sintered body composed of the metal fiber of FIG.

4 is a flowchart showing a process of manufacturing the metal fiber sintered body of FIG.

<Description of the code | symbol about the principal part of drawing>

10 ... metal bodies (rods, plates, blocks, etc.) 11 ... metal fibers

110 ... metal fiber sintered body (plate) 20 ... abrasive stone

30 ... collection case 40 ... molding mold

In order to achieve the above object, the metal fiber sintered body manufacturing method according to the present invention, the metal fiber forming step of forming a metal fiber of a predetermined width and length by grinding the metal (S1); Foreign matter or abrasive oil removing step (S2) of removing foreign substances or abrasive oil generated during polishing; A metal fiber group molding step (S3) of collecting the metal fibers from which foreign substances and abrasive oils have been removed and molding them to a predetermined shape; Sintering step of sintering the formed metal fiber group to bond the metal fibers to each other (S4); And a surface flattening step (S5) of pressing the sintered metal fiber group to make the surface flat.

In the present invention. The length of the said metal fiber is 50-500 micrometers, and thickness is 10-100 micrometers.

The temperature for sintering is in the range of 1000 ° C to 1550 ° C.

In addition, the porosity of the sintered compact sintered is 30 to 90%.

And the density of the sintered compact sintered shall be 0.7-6.0 g / Pa.

Hereinafter, a method of manufacturing a metal fiber sintered body of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view showing a method of obtaining a metal fiber used in the metal fiber sintered body of the present invention using abrasive stone, Figure 2 is a view showing a state in which the metal fiber of Figure 1 is contained in a molding die, Figure 3 Is a perspective view of the metal fiber sintered compact comprised from the metal fiber of FIG. 1, and FIG. 4 is a flowchart which shows the process of manufacturing the metal fiber sintered compact of FIG. As shown, the method for producing a metal fiber sintered body according to the present invention includes a metal fiber forming step (S1) of grinding a metal body into a metal fiber having a length of 10 to 200 μm.

When the metal body 10, such as rod-shaped or plate-shaped or bulky, is polished by frictional contact with a rotating abrasive stone (or abrasive belt) 20, a metal fiber 11 is obtained together with a spark. ) Is collected into a collection case (30). At this time, the size of the metal fiber 11 varies depending on the size of the particles of the abrasive stone 20 and the rotational speed of the abrasive stone 20, the length of the metal fiber 11 is 50 ~ 500㎛, thickness of 10 ~ 100㎛ The size and rotation speed of the abrasive stone particles are appropriately adjusted to fall within the range.

Next, a foreign matter or abrasive oil removing step (S2) of removing foreign matter or abrasive oil generated during polishing is performed. Since the collected metal fibers contain foreign matter or abrasive oil such as abrasive stone particles, the foreign matter and abrasive oil are removed by washing the metal fibers with an organic solvent under magnetic force or at a temperature of 200 ° C. or higher. At this time, care should be taken to pay close attention to the drying temperature range so as not to produce an oxide in the process of drying the metal fiber.

Next, a metal fiber group forming step (S3) of collecting the metal fibers from which foreign substances and abrasive oils have been removed and molding them to a predetermined shape is performed. In the metal fiber group forming step (S3), the metal fibers 11 sorted to a predetermined size are formed on a forming mold (or metal mesh) 40 and laminated as shown in FIG. 2 to form a plate shape or a required shape. .

Next, the sintering process of the molded metal fiber group is performed to sinter the metal fibers 11 to each other (S4). It is preferable that the temperature for sintering is in the range of 1000 ° C to 1550 ° C. If the temperature is less than 1000 ° C, sintering is generally not performed. If the temperature is above 1550 ° C, the original shape of the metal fiber is sintered while the original shape of the metal fiber is deformed. .

Then, the surface flattening step (S5) of pressing the sintered metal fiber group to flatten the surface is performed. The surface flattening step (S5) may be implemented by passing a group of metal fibers between two rollers (not shown), or may be implemented by putting a predetermined mold body (not shown) and pressing the surface with a flat plate (not shown). It may be. At this time, since the density and porosity of the metal fiber group may vary depending on the pressurized conditions, the metal fiber sintered body (plate) as shown in FIG. At this time, although the density and the porosity of a sintered compact vary according to the conditions to pressurize, it is preferable that density shall be 0.7-6.0 g / Pa and porosity be about 30 to 90%.

The metal fiber sintered body (plate) 110 manufactured by the above process has the following characteristics.

First, since the whole is made of metal, it is excellent in high temperature and oxidation resistance and resistant to thermal shock. Secondly, since it is a porous body made of fine metal fibers, it has a higher surface area than any metal structure. Third, it has a high porosity (30%-90%) and can make a density low or high.

Industrial uses of the metal fiber sintered body produced by the above process is as follows.

1) Sound-absorbing material-It is very effective to reduce high frequency noise. Therefore, it is used for the part which generate | occur | produces a lot, such as an air conditioner duct and a gas turbine.

2) Metal filter-The open pores are formed by intersecting metal fibers with excellent ventilation and dust collection performance. In addition, since it is made of metal as a whole, it is also used for filtering in a high temperature state.

3) Electrode-It is useful as a test electrode in chemical process because it has high specific surface area and high ventilation rate.

4) Gaskets-Suitable for loaded gaskets due to their predictable stress-strain relationship. It is suitable for places where conductivity is required or to maintain a constant load distribution or to prevent overload.

5) Electromagnetic wave shielding and antistatic materials-When mixed with plastics and non-woven fabrics, it is light in weight and effectively shields electromagnetic waves or prevents static electricity.

Although the present invention has been described with reference to one embodiment shown in the drawings, which is merely exemplary, and those skilled in the art will appreciate that various modifications and equivalent other embodiments are possible therefrom.

As described above, the metal fiber sintered body according to the present invention is obtained by sintering fine metal fibers obtained through polishing, and thus has higher productivity than any metal fiber sintered body produced so far.

In addition, since the size of the metal fiber is much smaller than that of the conventional one, there is an effect that the sound absorption, filtering ability and the like are much larger than the conventional metal fiber sintered body.

Claims (5)

A metal fiber forming step (S1) of grinding metal to form metal fibers having a predetermined width and length; Foreign matter or abrasive oil removing step (S2) of removing foreign substances or abrasive oil generated during polishing; A metal fiber group molding step (S3) of collecting the metal fibers from which foreign substances and abrasive oils have been removed and molding them to a predetermined shape; Sintering step of sintering the formed metal fiber group to bond the metal fibers to each other (S4); And Method for producing a metal fiber sintered body comprising a; surface flattening step (S5) to pressurize the sintered metal fiber group to make the surface flat. The method of claim 1, The length of the said metal fiber is 50-500 micrometers, and the thickness is the range of 10-100 micrometers manufacturing method of the metal fiber sintered compact. The method of claim 1, The temperature for the sintering process is a method for producing a metal fiber sintered body, characterized in that the range of 1000 ℃ to 1550 ℃. The method of claim 1, The porosity of the sintered sintered compact is a method of producing a metal fiber sintered body, characterized in that 30 to 90%. The method of claim 1, The density of said sintered sintered compact is 0.7-6.0 g / Pa, The manufacturing method of the metal fiber sintered compact characterized by the above-mentioned.