CN113333750A - Preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio - Google Patents

Preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio Download PDF

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CN113333750A
CN113333750A CN202110601970.7A CN202110601970A CN113333750A CN 113333750 A CN113333750 A CN 113333750A CN 202110601970 A CN202110601970 A CN 202110601970A CN 113333750 A CN113333750 A CN 113333750A
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metal fiber
porous material
ratio
compressed
fiber porous
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CN113333750B (en
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马军
王建忠
敖庆波
吴琛
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Northwest Institute for Non Ferrous Metal Research
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Northwest Institute for Non Ferrous Metal Research
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/002—Manufacture of articles essentially made from metallic fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B22F3/1103—Making porous workpieces or articles with particular physical characteristics

Abstract

The invention discloses a preparation process of a metal fiber porous material with a three-dimensional negative Poisson's ratio, which comprises the following steps: firstly, a plurality of wavy metal fiber wires are arranged in parallel to form a metal fiber bundle, and then the metal fiber bundle is compressed; and secondly, sintering the compressed metal fiber bundle at high temperature to obtain the metal fiber porous material with the three-dimensional negative Poisson's ratio effect. The process comprises the steps of forming a fiber bundle by using wavy metal fiber wires, then compressing and sintering, remarkably increasing the node density of the metal fiber porous material, enabling two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires to have similar inward concave hole structures, enabling the metal fiber porous material to transversely expand when stretched in the length direction and transversely contract when compressed, and preparing the metal fiber porous material with a three-dimensional negative Poisson's ratio.

Description

Preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio
Technical Field
The invention belongs to the technical field of porous materials, and particularly relates to a preparation process of a metal fiber porous material with a three-dimensional negative Poisson's ratio.
Background
A negative Poisson ratio material is one that undergoes significant transverse elongation when elongated in the longitudinal direction and significant transverse contraction when contracted in the longitudinal direction, with the Poisson ratio being such that<0, the characteristic has the effect of converting longitudinal strain into larger transverse strain, so that the strain sensor has larger application value in the field of strain sensors and high-performance fasteners. Poisson's ratio is expressed as follows: v. ofyz＝εz/εyWherein v isyzIs Poisson's ratio, epsilonzIs a transverse strain in the thickness direction of the elastic phase, epsilonyIs the longitudinal strain in the in-plane direction of the elastic phase.
Most negative poisson's ratio materials at present only have a two-dimensional effect, for example, a preparation process of a 316L stainless steel fiber sintered felt is disclosed in a patent with publication number CN107790721A, the prepared 316L stainless steel fiber sintered felt has a significant tensile negative poisson's ratio effect, but the negative poisson's ratio effect is only generated in a thickness direction, that is, the negative poisson's ratio effect can only be generated in one transverse direction perpendicular to a longitudinal direction, so that the material is a two-dimensional negative poisson's ratio material, and many applications require that the material has the negative poisson's ratio effect in a plane perpendicular to the longitudinal direction, that is, the three-dimensional negative poisson's ratio effect.
There is therefore a need to develop materials with a three-dimensional negative poisson's ratio effect.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a preparation process of a metal fiber porous material with a three-dimensional negative poisson's ratio, aiming at the defects of the prior art. According to the process, a plurality of wavy metal fiber wires form a fiber bundle, then compression and sintering are carried out in sequence, the node density of the metal fiber porous material is remarkably increased, two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires are enabled to have similar concave hole structures, the metal fiber wires are easy to expand and deform transversely when being stretched in the length direction of the metal fiber wires, the metal fiber wires are easy to shrink and deform transversely when being compressed in the length direction of the metal fiber wires, and the metal fiber porous material which expands transversely when being stretched and contracts transversely when being compressed and has a three-dimensional negative Poisson's ratio is prepared.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation process of a metal fiber porous material with a three-dimensional negative Poisson's ratio is characterized by comprising the following steps:
step one, a plurality of wavy metal fiber yarns are arranged in parallel to form a metal fiber bundle, and then the metal fiber bundle is compressed to obtain a compressed metal fiber bundle; the compression process comprises the following steps: compressing the metal fiber bundles from two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires respectively; the porosity of the compressed metal fiber bundle is 80-90%;
and step two, sintering the compressed metal fiber bundle obtained in the step one at a high temperature to obtain the metal fiber porous material with the three-dimensional negative Poisson's ratio effect.
According to the invention, a plurality of wavy metal fiber wires are arranged in parallel to form a metal fiber bundle, and the wavy metal fiber wires have a certain curvature, so that the wavy metal fiber wires in the prepared metal fiber bundle can be overlapped with each other after being compressed to form an inwards concave structure, thereby having Poisson's ratio effects in two directions;
the invention compresses the metal fiber bundle firstly, then sinters the metal fiber bundle in loose state, that is, the metal fiber bundle is firstly stacked in loose state and compressed from two mutually vertical directions vertical to the length direction of the metal fiber bundle respectively, so that the volume of the metal fiber bundle is reduced, the wavy metal fiber bundles are contacted with each other, the porosity is controlled to be 80% -90%, then sinters the metal fiber bundle in loose state, sintering nodes are generated between the wavy metal fiber bundles, the node density of the metal fiber porous material is obviously increased by sequentially compressing and sintering, the two mutually vertical directions vertical to the length direction of the metal fiber bundle are provided with similar inner concave hole structures, the metal fiber bundle is easy to generate transverse expansion deformation when being stretched in the length direction of the metal fiber bundle, and obvious negative Poisson ratio effect is generated in the two mutually vertical directions vertical to the length direction of the metal fiber bundle, the metal fiber wires are easy to shrink and deform transversely when compressed along the length direction of the metal fiber wires, and a remarkable negative Poisson ratio effect of compression is generated in two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires, so that the metal fiber porous material with three-dimensional negative Poisson ratio, which expands transversely when stretched and contracts transversely when compressed, is prepared.
The preparation process of the metal fiber porous material with the three-dimensional positive and negative Poisson's ratio is characterized in that in the step one, the number of the metal fibers is more than 100. According to the invention, the number of the wavy metal fiber wires is controlled, so that the obtained metal fiber porous material has a certain volume, and the Poisson's ratio effect of the metal fiber porous material in two directions is realized.
The preparation process of the metal fiber porous material with the three-dimensional negative Poisson's ratio is characterized in that the diameter of the wavy metal fiber wire in the step one is 50-200 mu m, and the curvature radius of waves in the wavy metal fiber wire is 2-5 cm. According to the invention, the wire diameter of the wavy metal fiber wire is controlled to enable the wavy metal fiber wire to have proper strength, so that the prepared metal fiber porous material is ensured to have Poisson ratio effects in two directions, the curvature radius of waves in the metal fiber wire is controlled to ensure that the wavy metal fiber wire can form a metal fiber bundle, the wavy metal fiber wires can be overlapped with each other to form an inwards concave structure, and the metal fiber porous material is ensured to have the Poisson ratio effects in two directions.
The preparation process of the metal fiber porous material with the three-dimensional positive and negative Poisson's ratio is characterized in that the wavy metal fiber wire in the step one is made of an iron alloy fiber wire, a copper alloy fiber wire, an aluminum alloy fiber wire or a titanium alloy fiber wire. The invention controls the material quality of the metal fiber wires, is easy to compress and deform under the condition of good strength, and ensures that the metal fiber porous material has the Poisson ratio effect in two directions.
The preparation process of the metal fiber porous material with the three-dimensional negative Poisson's ratio is characterized in that the sintering treatment in the second step is carried out at the temperature of 700-1200 ℃ for 10-60 min. According to the invention, by controlling the temperature and time of sintering treatment, sintering nodes with enough strength are formed between the wavy metal fiber wires, excessive shrinkage is not generated, and the Poisson ratio effect of the metal fiber porous material in two directions is ensured.
The preparation process of the metal fiber porous material with the three-dimensional negative Poisson's ratio is characterized in that the compression in the step one is carried out at room temperature. According to the invention, through compression at room temperature, metallurgical bonding cannot occur at contact points between the wavy metal fiber wires in the compression process, the node density is low, and the metal fibers in the metal fiber porous material are ensured to have enough bending degree in two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires, so that the metal fiber porous material is ensured to have the Poisson ratio effect in two directions.
The preparation process of the metal fiber porous material with the three-dimensional negative Poisson's ratio is characterized in that the compressive strain in each direction in the compression in the step one is more than 20%. The invention ensures that the wavy metal fiber wires in the metal fiber porous material have a certain concave shape in each direction by controlling the compressive strain in each direction in compression, thereby ensuring that the metal fiber porous material has the Poisson's ratio effect in two directions.
Compared with the prior art, the invention has the following advantages:
1. the invention makes the wavy metal fiber wires into the fiber bundle, then compresses the metal fiber bundle, then sinters, firstly loosely packs and stacks the metal fiber wires to compress from two transverse directions, so that the volume of the metal fiber bundle is reduced, the wavy metal fiber wires are contacted with each other, then sinters, generates sintering nodes between the wavy metal fiber wires, obviously increases the node density of the metal fiber porous material by sequentially compressing and sintering, ensures that two mutually vertical directions vertical to the length direction of the metal fiber wires have similar inner concave hole structures, the metal fiber wires are easy to generate transverse expansion deformation when being stretched in the length direction of the metal fiber wires, the metal fiber wires are easy to generate transverse contraction deformation when being compressed in the length direction of the metal fiber wires, and the invention prepares the metal fiber bundle with transverse expansion when being stretched, a metal fiber porous material with three-dimensional negative poisson's ratio, which contracts transversely when compressed.
2. According to the invention, the obtained metal fiber porous material has a certain volume by adopting more than 100 wavy metal fiber wires, so that the metal fiber porous material has a Poisson ratio effect in two directions, the metal fibers in the prepared metal fiber bundle are overlapped after being compressed by adopting the wavy metal fiber wires with a certain curvature to form an inwards concave structure, so that the metal fiber porous material has the Poisson ratio effect in two directions, and the strength of the metal fiber porous material is ensured by controlling the wire diameter of the wavy metal fiber wires.
3. According to the invention, by controlling the temperature and time of sintering treatment, sintering nodes with enough strength are formed between the wavy metal fiber wires, excessive shrinkage is not generated, and the Poisson ratio effect of the metal fiber porous material in two directions is ensured.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram showing the deformation of a tensile specimen of a metal fiber porous material prepared in example 1 of the present invention when it is stretched.
FIG. 2 is a schematic view showing the deformation of a compressed sample of the metal fiber porous material prepared in example 1 of the present invention when compressed.
FIG. 3 is a strain curve diagram of a metal fiber porous material prepared in example 1 of the present invention when a tensile sample is stretched.
FIG. 4 is a strain curve diagram of a metal fiber porous material prepared in example 1 of the present invention when a compression sample is compressed.
FIG. 5 is a schematic view showing deformation of a tensile specimen of a metal fiber porous material prepared in comparative example 1 according to the present invention when it is stretched.
FIG. 6 is a strain curve diagram of a metal fiber porous material tensile sample prepared in comparative example 1 according to the present invention when it is stretched.
Detailed Description
Example 1
The embodiment comprises the following steps:
step one, arranging 150 wavy metal fiber yarns in parallel to form a metal fiber bundle, and then compressing the metal fiber bundle to obtain a compressed metal fiber bundle; the compression process comprises the following steps: compressing the metal fiber bundles from two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires respectively; the porosity of the compressed metal fiber bundle is 90%, the wire diameter of the metal fiber wires is 200 μm, the curvature radius of waves in the wavy metal fiber wires is 2 cm-5 cm, the metal fiber wires are 316L stainless steel fiber wires, the compression is performed at 30 ℃, and the compression strain in each direction in the compression is equal and 50%;
step two, sintering the compressed metal fiber bundle obtained in the step one at high temperature to obtain a metal fiber porous material with a three-dimensional negative Poisson's ratio effect; the sintering treatment temperature is 1200 ℃, and the time is 60 min.
The metal fiber porous material prepared in this example was prepared by wire-cutting a metal fiber porous material tensile sample having dimensions of 4mm × 5mm × 32mm (length × width × height), in which the length direction of the metal fiber filaments in the metal fiber porous material tensile sample was parallel to the height direction of the metal fiber porous material tensile sample, defined as x direction, the width direction as z direction, and the height direction as y direction.
The metal fiber porous material prepared in this example was cut by wire to prepare a metal fiber porous material compressed sample having dimensions of 4mm × 4mm × 8mm (length × width × height), the length direction of the metal fiber porous material tensile sample was defined as x direction, the width direction was defined as z direction, and the height direction was defined as y direction, and the length direction of the metal fiber filaments in the metal fiber porous material compressed sample was parallel to the height direction of the metal fiber porous material compressed sample.
Fig. 1 is a schematic diagram of deformation of a metal fiber porous material tensile sample prepared in this example when being stretched, and it can be seen from fig. 1 that, when the metal fiber porous material tensile sample is stretched in the y direction, both the z direction and the x direction of the metal fiber porous material tensile sample expand, which illustrates that the metal fiber porous material prepared in this example has a three-dimensional negative poisson's ratio effect when being stretched.
Fig. 2 is a schematic diagram of deformation of the metal fiber porous material compressed sample prepared in this example when being compressed, and it can be seen from fig. 2 that, when the metal fiber porous material compressed sample is compressed in the y direction, both the z direction and the x direction of the metal fiber porous material compressed sample shrink, which illustrates that the metal fiber porous material prepared in this example has a three-dimensional negative poisson's ratio effect when being compressed.
Fig. 3 is a strain curve diagram of the metal fiber porous material tensile sample prepared in the present example when being stretched, and as can be seen from fig. 3, the abscissa is the strain in the y direction, and the ordinate is the strain in the z direction and the strain in the x direction, and the strain in the z direction and the strain in the x direction increase with the strain in the y direction increasing, which illustrates that when the metal fiber porous material tensile sample prepared in the present example is stretched in the y direction, the metal fiber porous material tensile sample prepared in the present example expands in both the z direction and the x direction, and the metal fiber porous material prepared in the present example has a three-dimensional negative poisson's ratio effect when being stretched, and the poisson's ratio in the x direction is measured as-0.67, and the poisson's ratio in the y direction is measured as-0.19.
Fig. 4 is a strain curve diagram of the metal fiber porous material compression sample prepared in the present example when being compressed, and it can be seen from fig. 4 that the abscissa is the strain in the y direction, the ordinate is the strain in the z direction and the strain in the x direction, and the strain in the z direction and the strain in the x direction increase as the strain in the y direction decreases, which illustrates that when the metal fiber porous material compression sample prepared in the present example is compressed in the y direction, the metal fiber porous material compression sample shrinks in both the z direction and the x direction, and the metal fiber porous material prepared in the present example has a three-dimensional negative poisson ratio effect when being compressed, and the poisson ratio in the x direction is measured as-0.54, and the poisson ratio in the y direction is measured as-0.78.
Through detection, the metal fiber porous material prepared in the embodiment has a negative poisson's ratio effect in both the length direction and the width direction when being stretched and compressed in the height direction, and the metal fiber porous material prepared in the embodiment has a three-dimensional negative poisson's ratio effect.
Comparative example 1
This comparative example comprises the following steps:
step one, arranging 150 wavy metal fiber yarns in parallel to form a metal fiber bundle, and then compressing the metal fiber bundle to obtain a compressed metal fiber bundle; the compression process comprises the following steps: compressing the metal fiber bundle from the length direction of the metal fiber wire; the porosity of the compressed metal fiber bundle is 90%, the wire diameter of the metal fiber wires is 200 μm, the curvature radius of waves in the wavy metal fiber wires is 2 cm-5 cm, the metal fiber wires are 316L stainless steel fiber wires, the compression is performed at 30 ℃, and the compression strain in each direction in the compression is equal and 50%;
step two, sintering the compressed metal fiber bundle obtained in the step one at a high temperature to obtain a metal fiber porous material; the sintering treatment temperature is 1200 ℃, and the time is 60 min.
The metal fiber porous material prepared in the present comparative example was prepared by wire-cutting a metal fiber porous material tensile sample having dimensions of 4mm × 5mm × 32mm (length × width × height), in which the length direction of the metal fiber filaments in the metal fiber porous material tensile sample was parallel to the height direction of the metal fiber porous material tensile sample, defined as x direction, the width direction as z direction, and the height direction as y direction.
Fig. 5 is a schematic diagram of deformation of the metal fiber porous material tensile sample prepared in the comparative example when being stretched, and it can be seen from fig. 5 that when the metal fiber porous material tensile sample is stretched in the y direction, the metal fiber porous material tensile sample shrinks in the x direction and expands in the z direction, which shows that the metal fiber porous material prepared in the comparative example does not have three-dimensional negative poisson's ratio effect when being stretched.
Fig. 6 is a strain curve diagram of the metal fiber porous material tensile sample prepared in the comparative example when being stretched, and it can be seen from fig. 6 that the abscissa is the strain in the y direction, the ordinate is the strain in the z direction and the strain in the x direction, the strain in the x direction is reduced and the strain in the z direction is increased as the strain in the y direction is increased, which shows that when the metal fiber porous material tensile sample prepared in the comparative example is stretched in the y direction, the metal fiber porous material tensile sample prepared in the comparative example contracts in the x direction and expands in the z direction, the metal fiber porous material prepared in the comparative example has no three-dimensional negative poisson ratio effect when being stretched, and the poisson ratio in the x direction is measured to be 0.34, and the poisson ratio in the y direction is measured to be-0.44.
Through detection, the poisson's ratio effects in the length direction and the width direction of the metal fiber porous material prepared by the comparative example are inconsistent when the metal fiber porous material is stretched in the height direction, and the metal fiber porous material prepared by the comparative example does not have a three-dimensional negative poisson's ratio effect.
It can be seen from comparison of comparative example 1 with example 1 that when the metal fiber bundles are compressed in the length direction of the metal fiber wires, the prepared metal fiber porous material does not have a three-dimensional negative poisson's ratio effect, which illustrates that the wavy metal fiber wires can be contacted with each other to form sintered nodes only by compressing the metal fiber bundles in two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires, so that the three-dimensional negative poisson's ratio effect is generated in both transverse directions of the metal fiber porous material.
Example 2
The embodiment comprises the following steps:
step one, arranging 200 wavy metal fiber wires in parallel to form a metal fiber bundle, and then compressing the metal fiber bundle to obtain a compressed metal fiber bundle; the compression process comprises the following steps: compressing the metal fiber bundles from two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires respectively; the porosity of the compressed metal fiber bundle is 88%, the wire diameter of the metal fiber wire is 50 μm, the curvature radius of waves in the wavy metal fiber wire is 2 cm-5 cm, the metal fiber wire is H65 copper alloy fiber wire, the compression is carried out at the temperature of 20 ℃, and the compression strains in two mutually perpendicular directions in the compression are 90% and 80% respectively;
step two, sintering the compressed metal fiber bundle obtained in the step one at high temperature to obtain a metal fiber porous material with a three-dimensional negative Poisson's ratio effect; the sintering treatment temperature is 1000 ℃, and the time is 30 min.
The metal fiber porous material prepared in this example was cut by wire to prepare a metal fiber porous material tensile sample having dimensions of 4mm × 5mm × 32mm (length × width × height), in which the length direction of the metal fiber filaments was parallel to the height direction of the metal fiber porous material tensile sample, and the metal fiber porous material tensile sample was stretched in the height direction of the metal fiber porous material tensile sample, and the poisson ratio in the length direction was-0.13 and the poisson ratio in the width direction was-0.14, respectively, as measured.
The metal fiber porous material prepared in this example was cut by wire to prepare a metal fiber porous material compressed sample having dimensions of 4mm × 4mm × 8mm (length × width × height), the length direction of the metal fiber filaments in the metal fiber porous material compressed sample was parallel to the height direction of the metal fiber porous material compressed sample, and the metal fiber porous material compressed sample was compressed in the height direction of the metal fiber porous material compressed sample, and the poisson ratio in the length direction was found to be-0.45 and the poisson ratio in the width direction was found to be-0.63.
Through detection, the metal fiber porous material prepared in the embodiment has a negative poisson's ratio effect in both the length direction and the width direction when being stretched and compressed in the height direction, and the metal fiber porous material prepared in the embodiment has a three-dimensional negative poisson's ratio effect.
Example 3
The embodiment comprises the following steps:
step one, arranging 130 wavy metal fiber yarns in parallel to form a metal fiber bundle, and then compressing the metal fiber bundle to obtain a compressed metal fiber bundle; the compression process comprises the following steps: compressing the metal fiber bundles from two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires respectively; the porosity of the compressed metal fiber bundle is 85%, the wire diameter of the metal fiber wire is 100 μm, the curvature radius of waves in the wavy metal fiber wire is 2 cm-5 cm, the metal fiber wire is 6063 aluminum alloy fiber wire, the compression is carried out at the temperature of 25 ℃, and the compression strains in two mutually perpendicular directions in the compression are respectively 50% and 60%;
step two, sintering the compressed metal fiber bundle obtained in the step one at high temperature to obtain a metal fiber porous material with a three-dimensional negative Poisson's ratio effect; the sintering treatment temperature is 700 ℃, and the time is 10 min.
The metal fiber porous material prepared in the example was cut by wire to prepare a metal fiber porous material tensile sample having dimensions of 4mm × 5mm × 32mm (length × width × height), in which the length direction of the metal fiber filaments was parallel to the height direction of the metal fiber porous material tensile sample, and the metal fiber porous material tensile sample was stretched in the height direction of the metal fiber porous material tensile sample, and the poisson ratio in the length direction was-2.1 and the poisson ratio in the width direction was-2.5.
The metal fiber porous material prepared in the example was cut by wire to prepare a metal fiber porous material compressed sample having dimensions of 4mm × 4mm × 8mm (length × width × height), the length direction of the metal fiber filaments in the metal fiber porous material compressed sample was parallel to the height direction of the metal fiber porous material compressed sample, and the metal fiber porous material compressed sample was compressed in the height direction of the metal fiber porous material compressed sample, and the poisson ratio in the length direction was found to be-2.6 and the poisson ratio in the width direction was found to be-2.7.
Through detection, the metal fiber porous material prepared in the embodiment has a negative poisson's ratio effect in both the length direction and the width direction when being stretched and compressed in the height direction, and the metal fiber porous material prepared in the embodiment has a three-dimensional negative poisson's ratio effect.
Example 4
The embodiment comprises the following steps:
step one, 170 wavy metal fiber wires are arranged in parallel to form a metal fiber bundle, and then the metal fiber bundle is compressed to obtain a compressed metal fiber bundle; the compression process comprises the following steps: compressing the metal fiber bundles from two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires respectively; the porosity of the compressed metal fiber bundle is 80%, the wire diameter of the metal fiber wire is 150 μm, the curvature radius of waves in the wavy metal fiber wire is 2 cm-5 cm, the metal fiber wire is TC4 titanium alloy fiber wire, the compression is carried out at 27 ℃, and the compression strain in each direction in the compression is equal and 30%;
step two, sintering the compressed metal fiber bundle obtained in the step one at high temperature to obtain a metal fiber porous material with a three-dimensional negative Poisson's ratio effect; the sintering treatment temperature is 1200 ℃, and the time is 50 min.
The metal fiber porous material prepared in the example was cut by wire to prepare a metal fiber porous material tensile sample having dimensions of 4mm × 5mm × 32mm (length × width × height), in which the length direction of the metal fiber filaments was parallel to the height direction of the metal fiber porous material tensile sample, and the metal fiber porous material tensile sample was stretched in the height direction of the metal fiber porous material tensile sample, and the poisson ratio in the length direction was-3.2 and the poisson ratio in the width direction was-3.4.
The metal fiber porous material prepared in the example was cut by wire to prepare a metal fiber porous material compressed sample having dimensions of 4mm × 4mm × 8mm (length × width × height), the length direction of the metal fiber filaments in the metal fiber porous material compressed sample was parallel to the height direction of the metal fiber porous material compressed sample, and the metal fiber porous material compressed sample was compressed in the height direction of the metal fiber porous material compressed sample, and the poisson ratio in the length direction was found to be-1.4 and the poisson ratio in the width direction was found to be-1.7.
Through detection, the metal fiber porous material prepared in the embodiment has a negative poisson's ratio effect in both the length direction and the width direction when being stretched and compressed in the height direction, and the metal fiber porous material prepared in the embodiment has a three-dimensional negative poisson's ratio effect.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.

Claims (7)

1. A preparation process of a metal fiber porous material with a three-dimensional negative Poisson's ratio is characterized by comprising the following steps:
step one, a plurality of wavy metal fiber yarns are arranged in parallel to form a metal fiber bundle, and then the metal fiber bundle is compressed to obtain a compressed metal fiber bundle; the compression process comprises the following steps: compressing the metal fiber bundles from two mutually perpendicular directions perpendicular to the length direction of the metal fiber wires respectively; the porosity of the compressed metal fiber bundle is 80-90%;
and step two, sintering the compressed metal fiber bundle obtained in the step one at a high temperature to obtain the metal fiber porous material with the three-dimensional negative Poisson's ratio effect.
2. The process for preparing a metal fiber porous material with three-dimensional positive and negative Poisson's ratio as claimed in claim 1, wherein the number of the plurality in the first step is more than 100.
3. The process for preparing a metal fiber porous material with a three-dimensional negative Poisson's ratio as claimed in claim 1, wherein the diameter of the wavy metal fiber wire in the first step is 50 μm to 200 μm, and the curvature radius of the waves in the wavy metal fiber wire is 2cm to 5 cm.
4. The process for preparing a metal fiber porous material with three-dimensional positive and negative Poisson's ratio as claimed in claim 1, wherein the wavy metal fiber wire in the first step is made of iron alloy fiber wire, copper alloy fiber wire, aluminum alloy fiber wire or titanium alloy fiber wire.
5. The process for preparing the metal fiber porous material with the three-dimensional negative Poisson's ratio as claimed in claim 1, wherein the sintering treatment in the second step is carried out at a temperature of 700-1200 ℃ for 10-60 min.
6. The process for preparing a metal fiber porous material with three-dimensional negative Poisson's ratio as claimed in claim 1, wherein the compression in the first step is performed at room temperature.
7. The process for preparing a metal fiber porous material with three-dimensional negative Poisson's ratio as claimed in claim 1, wherein the compressive strain in each direction in the compression in the step one is more than 20%.
CN202110601970.7A 2021-05-31 2021-05-31 Preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio Active CN113333750B (en)

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GB201117664D0 (en) * 2011-09-06 2011-11-23 Univ Malta Stents with zero poisson's ratio cells
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