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A preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio

A metal fiber, negative Poisson's ratio technology, applied in the field of porous materials, to achieve the effect of increasing node density

Active Publication Date: 2022-08-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most negative Poisson's ratio materials only have a two-dimensional effect. For example, the patent with the publication number CN107790721A discloses a preparation process for a 316L stainless steel fiber sintered felt. The prepared 316L stainless steel fiber sintered felt has significant tensile negative Poisson's ratio. The negative Poisson's ratio effect, but its negative Poisson's ratio effect only occurs in the thickness direction, that is, it can only have a negative Poisson's ratio effect in a transverse direction perpendicular to the longitudinal direction, so it is a two-dimensional negative Poisson's ratio material. Many applications require that it has a negative Poisson's ratio effect in a plane perpendicular to the longitudinal direction, that is, a three-dimensional negative Poisson's ratio effect.

Method used

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  • A preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio
  • A preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio
  • A preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio

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Embodiment 1

[0029] This embodiment includes the following steps:

[0030] Step 1: Arrange 150 wavy metal fiber filaments in parallel to form a metal fiber bundle, and then compress the metal fiber bundle to obtain a compressed metal fiber bundle; the compression process is: from a direction perpendicular to the length of the metal fiber filaments. The metal fiber bundle is compressed in two mutually perpendicular directions; the porosity of the compressed metal fiber bundle is 90%, the wire diameter of the metal fiber wire is 200 μm, and the curvature of the wave in the wavy metal fiber wire The radius is 2cm-5cm, the metal fiber wire is 316L stainless steel fiber wire, the compression is carried out under the condition of 30°C, and the compressive strain in each direction in the compression is equal and 50%;

[0031] Step 2, sintering the compressed metal fiber bundle obtained in step 1 at high temperature to obtain a metal fiber porous material with three-dimensional negative Poisson's ...

Embodiment 2

[0049] This embodiment includes the following steps:

[0050] Step 1: Arrange 200 wavy metal fiber filaments in parallel to form a metal fiber bundle, and then compress the metal fiber bundle to obtain a compressed metal fiber bundle; the compression process is: from a direction perpendicular to the length of the metal fiber filaments. The metal fiber bundle is compressed in two mutually perpendicular directions; the porosity of the compressed metal fiber bundle is 88%, the wire diameter of the metal fiber wire is 50 μm, and the curvature of the wave in the wavy metal fiber wire The radius is 2cm-5cm, the metal fiber filament is H65 copper alloy fiber filament, the compression is performed under the condition of 20°C, and the compressive strains in the two mutually perpendicular directions during the compression are 90% and 80% respectively;

[0051] In step 2, the compressed metal fiber bundle obtained in step 1 is sintered at high temperature to obtain a metal fiber porous m...

Embodiment 3

[0056] This embodiment includes the following steps:

[0057] Step 1: Arrange 130 wavy metal fiber filaments in parallel to form a metal fiber bundle, and then compress the metal fiber bundle to obtain a compressed metal fiber bundle; the compression process is: from a direction perpendicular to the length of the metal fiber filaments. The metal fiber bundle is compressed in two mutually perpendicular directions; the porosity of the compressed metal fiber bundle is 85%, the wire diameter of the metal fiber wire is 100 μm, and the curvature of the wave in the wavy metal fiber wire The radius is 2cm-5cm, the metal fiber filaments are 6063 aluminum alloy fiber filaments, the compression is performed under the condition of 25°C, and the compressive strains in the two mutually perpendicular directions during the compression are 50% and 60% respectively;

[0058] In step 2, the compressed metal fiber bundle obtained in step 1 is sintered at high temperature to obtain a metal fiber p...

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Abstract

The invention discloses a process for preparing a metal fiber porous material with a three-dimensional negative Poisson's ratio. 2. The compressed metal fiber bundle is sintered at high temperature to obtain a metal fiber porous material with three-dimensional negative Poisson's ratio effect. This process significantly increases the node density of metal fiber porous materials by forming wavy metal fiber filaments into fiber bundles, followed by compression and sintering, so that two mutually perpendicular directions perpendicular to the length of the metal fiber filaments have similar internal The concave pore structure expands laterally when stretched in the longitudinal direction, and shrinks laterally when compressed, and a metal fiber porous material with three-dimensional negative Poisson's ratio is prepared.

Description

technical field [0001] The invention belongs to the technical field of porous materials, and in particular relates to a preparation process of a metal fiber porous material with a three-dimensional negative Poisson's ratio. Background technique [0002] Negative Poisson's ratio material refers to the obvious lateral elongation when longitudinal elongation occurs, and significant lateral shrinkage occurs when longitudinal shrinkage occurs, and its Poisson's ratio is <0. The effect of transverse strain makes it have great application value in the field of strain sensors and high-performance fasteners. Poisson's ratio is expressed as follows: v yz =ε z / ε y , where v yz is Poisson's ratio, ε z is the transverse strain along the thickness direction in the elastic stage, ε y is the longitudinal strain along the in-plane direction in the elastic phase. [0003] At present, most materials with negative Poisson's ratio only have two-dimensional effect. For example, the pat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11B22F3/02B22F3/10
CPCB22F3/11B22F3/002B22F3/02B22F3/10B22F3/1103
Inventor 马军王建忠敖庆波吴琛
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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