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A kind of preparation technology of 316l stainless steel fiber sintered felt

A technology of fiber sintered felt and preparation process, which is applied in the field of preparation of 316L stainless steel fiber sintered felt, can solve the problem of many sintered nodes, achieve simple process, improve negative Poisson's ratio effect, and be easy to popularize

Active Publication Date: 2019-07-12
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention patent of application publication number CN102861917A "Preparation method of metal fiber sintered felt" discloses a preparation method of stainless steel fiber sintered felt. and then sintered at 850℃~1150℃ for 1h~3h in protective atmosphere or vacuum condition. The obtained stainless steel fiber sintered felt has high porosity, but metallurgical bonding is formed in the places where the fibers contact each other, resulting in excessive sintering points. More, suppressing the negative Poisson's ratio effect of the product

Method used

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  • A kind of preparation technology of 316l stainless steel fiber sintered felt
  • A kind of preparation technology of 316l stainless steel fiber sintered felt

Examples

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Embodiment 1

[0020] This embodiment includes the following steps:

[0021] Step 1. Precompress the 316L stainless steel fiber felt along the in-plane direction to a porosity of 90% at room temperature; the in-plane direction is the direction in which the 316L stainless steel fiber felt is laid before pre-compression; The wire diameter is 28μm;

[0022] Step 2. Carry out vacuum sintering to the 316L stainless steel fiber felt pre-compressed in step 1, and then cool to room temperature to obtain a 316L stainless steel fiber sintered felt intermediate; the vacuum degree of vacuum sintering is 1×10 -2 Pa, the temperature is 1200℃, and the time is 10min;

[0023] Step 3, compressing the 316L stainless steel fiber sintered felt intermediate obtained in step 2 along the thickness direction to a porosity of 80%, to obtain a 316L stainless steel fiber sintered felt.

[0024] A cuboid sample of 130mm×20mm×3mm was selected from the 316L stainless steel fiber sintered mat prepared in this embodiment...

Embodiment 2

[0041] This embodiment includes the following steps:

[0042] Step 1. Precompress the 316L stainless steel fiber felt along the in-plane direction to a porosity of 92% at room temperature; the in-plane direction is the direction in which the 316L stainless steel fiber felt is laid before precompression; The wire diameter is 28μm;

[0043] Step 2. Carry out vacuum sintering to the 316L stainless steel fiber felt pre-compressed in step 1, and then cool to room temperature to obtain a 316L stainless steel fiber sintered felt intermediate; the vacuum degree of vacuum sintering is 1×10 -2 Pa, the temperature is 1200℃, and the time is 10min;

[0044] Step 3, compressing the 316L stainless steel fiber sintered felt intermediate obtained in step 2 along the thickness direction to a porosity of 80%, to obtain a 316L stainless steel fiber sintered felt.

[0045] A cuboid sample of 130mm×20mm×3mm was selected from the 316L stainless steel fiber sintered mat prepared in this example by wi...

Embodiment 3

[0047] This embodiment includes the following steps:

[0048] Step 1. Precompress the 316L stainless steel fiber felt along the in-plane direction to a porosity of 90% at room temperature; the in-plane direction is the direction in which the 316L stainless steel fiber felt is laid before pre-compression; The wire diameter is 28μm;

[0049] Step 2. Carry out vacuum sintering to the 316L stainless steel fiber felt pre-compressed in step 1, and then cool to room temperature to obtain a 316L stainless steel fiber sintered felt intermediate; the vacuum degree of vacuum sintering is 1×10 -2 Pa, the temperature is 1200℃, and the time is 10min;

[0050] Step 3, compressing the 316L stainless steel fiber sintered felt intermediate obtained in step 2 along the thickness direction to a porosity of 75%, to obtain a 316L stainless steel fiber sintered felt.

[0051] A cuboid sample of 130mm×20mm×3mm was selected from the 316L stainless steel fiber sintered mat prepared in this example by...

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Abstract

The invention discloses a preparation process for a 316L stainless steel fibre sintered felt. The preparation process comprises the following steps: firstly, pre-compressing the 316L stainless steel fibre sintered felt in an in-plane direction at room temperature until the porosity of the 316L stainless steel fibre sintered felt is 90 to 95 percent; secondly, performing vacuum sintering on the pre-compressed 316L stainless steel fibre sintered felt, and then cooling to the room temperature; and thirdly, compressing the 316L stainless steel fibre sintered felt which is cooled to the room temperature in a thickness direction until the porosity of the 316L stainless steel fibre sintered felt is not greater than 80 percent to obtain the 316L stainless steel fibre sintered felt. According to the preparation process for the 316L stainless steel fibre sintered felt, the 316L stainless steel fibre sintered felts before and after sintering are respectively subjected to pre-compressing and compressing treatment at the room temperature, so that fibres produce enough bending degree, and meanwhile, the number of sintering points is effectively controlled; finally, the 316L stainless steel fibresintered felt with a remarkable negative Poisson ratio effect is obtained; and the preparation process is simple in process, controllable in process, and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of metal fiber felt preparation, in particular to a preparation process of 316L stainless steel fiber sintered felt. Background technique [0002] Poisson's ratio refers to the negative number of the ratio of transverse strain to longitudinal strain when the material is deformed by force, which reflects the ability of the material to resist external loads. 316L stainless steel fiber sintered felt is a kind of negative Poisson's ratio porous material. When longitudinal elongation (or shrinkage) occurs, obvious transverse elongation (or shrinkage) will occur. This negative Poisson's ratio effect can convert the longitudinal strain into Transverse strain has great application value in the field of strain sensors. The larger the absolute value of Poisson's ratio, the higher the strain conversion efficiency, so a 316L stainless steel sintered fiber mat with a significant negative Poisson's ratio effect is requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/11B22F3/10
CPCB22F3/1007B22F3/11B22F2999/00B22F2201/20
Inventor 马军王建忠李爱君敖庆波
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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