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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: 2021-09-03
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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  • Preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio
  • Preparation process of metal fiber porous material with three-dimensional negative Poisson's ratio
  • 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 the direction perpendicular to the length of the metal fiber filament The metal fiber bundles are respectively compressed in two mutually perpendicular directions; the porosity of the compressed metal fiber bundles is 90%, the wire diameter of the metal fiber wires is 200 μm, and the curvature of the waves in the wavy metal fiber wires is The radius is 2cm-5cm, the metal fiber wire is 316L stainless steel fiber wire, the compression is carried out at 30°C, and the compression strain in each direction during the compression is equal and 50%;

[0031] Step 2: Sintering the compressed metal fiber bundles obtained in Step 1 at high temperature to obtain a metal fiber porous material with a three-dimensional negative P...

Embodiment 2

[0049] This embodiment includes the following steps:

[0050] Step 1. Arrange 200 wavy metal fibers in parallel to form metal fiber bundles, and then compress the metal fiber bundles to obtain compressed metal fiber bundles; the compression process is: from the direction perpendicular to the length of the metal fibers The metal fiber bundles are respectively compressed in two mutually perpendicular directions; the porosity of the compressed metal fiber bundles is 88%, the wire diameter of the metal fiber wires is 50 μm, and the curvature of the waves in the wavy metal fiber wires is The radius is 2cm to 5cm, the metal fiber is H65 copper alloy fiber, the compression is carried out at 20°C, and the compression strains in two mutually perpendicular directions during the compression are 90% and 80% respectively;

[0051] Step 2: Sintering the compressed metal fiber bundles obtained in Step 1 at high temperature to obtain a metal fiber porous material with a three-dimensional nega...

Embodiment 3

[0056] This embodiment includes the following steps:

[0057] Step 1. Arrange 130 wavy metal fibers in parallel to form metal fiber bundles, and then compress the metal fiber bundles to obtain compressed metal fiber bundles; the compression process is: The metal fiber bundles are respectively compressed in two mutually perpendicular directions; the porosity of the compressed metal fiber bundles is 85%, the wire diameter of the metal fiber wires is 100 μm, and the curvature of the waves in the wavy metal fiber wires is The radius is 2cm-5cm, the metal fiber wire is 6063 aluminum alloy fiber wire, the compression is carried out at 25°C, and the compression strains in two mutually perpendicular directions during the compression are 50% and 60% respectively;

[0058] Step 2: Sintering the compressed metal fiber bundles obtained in Step 1 at high temperature to obtain a metal fiber porous material with a three-dimensional negative Poisson's ratio effect; the temperature of the sint...

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Abstract

The invention discloses a preparation process of a metal fiber porous material with a three-dimensional negative Poisson's ratio. The preparation process comprises the following steps that firstly, multiple wave-shaped metal fibers are arranged in parallel to form a metal fiber bundle, and then the metal fiber bundle is compressed; and secondly, high-temperature sintering is carried out on the compressed metal fiber bundle to obtain the metal fiber porous material with the three-dimensional negative Poisson's ratio effect. According to the process, the wave-shaped metal fibers form the fiber bundle, then compression and sintering are carried out, the node density of the metal fiber porous material is remarkably increased, similar inwards-concave hole structures are formed in two mutually-perpendicular directions perpendicular to the length direction of the metal fibers, transverse expansion occurs when the metal fibers are stretched in the length direction, transverse contraction happens when the metal fibers are compressed, and the porous metal fiber material with the 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 means that when longitudinal elongation occurs, there will be obvious transverse elongation, and when longitudinal shrinkage will occur, obvious transverse shrinkage will occur, 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 stage. [0003] At present, most negative Poisson's ratio materials only have a two-dimensional effect. ...

Claims

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Application Information

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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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