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Preparation method for stainless steel fiber sintered felt

A fiber sintered mat and stainless steel technology, applied in the field of stainless steel materials, can solve the problems of inability to apply stainless steel fiber sintered felt, difficulty in manual direct compression, high compression resistance, etc., to achieve low-temperature short-term sintering, prevent rebound deformation, and firm metallurgical bonding Effect

Inactive Publication Date: 2015-11-18
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

Although this method is suitable for the preparation of cut fiber porous materials, due to the high elasticity and high compression resistance of the stainless steel fibers in the bundled and drawn state, it is difficult to compress directly by hand, and the material will rebound after the compression force is removed. lead to mold deformation
Therefore, this scheme cannot be applied to the preparation of stainless steel fiber sintered felt

Method used

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  • Preparation method for stainless steel fiber sintered felt
  • Preparation method for stainless steel fiber sintered felt
  • Preparation method for stainless steel fiber sintered felt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of the present embodiment stainless steel fiber sintered felt comprises the following steps:

[0023] Step 1. Place the stainless steel fiber felt in a vacuum sintering furnace at a vacuum degree of ≤1×10 -2 Under the condition of Pa, the stainless steel fiber felt is heated up to 400°C at a heating rate of 10°C / min and then kept for 60 minutes for low-temperature sintering treatment, and the low-temperature sintered felt is obtained after natural cooling; the stainless steel fiber in the stainless steel fiber felt is preferably made of a bundled 316L stainless steel fiber prepared by drawing method, the fiber diameter is 28 μm;

[0024] Step 2. Use a hydraulic press to compress the low-temperature sintered felt in step 1 to a porosity of 83%, and then place the compressed low-temperature sintered felt in a vacuum sintering furnace at a vacuum degree ≤ 1×10 -2 Under the condition of Pa, the compressed low-temperature sintered felt was heated up t...

Embodiment 2

[0027] The preparation method of the present embodiment stainless steel fiber sintered felt comprises the following steps:

[0028] Step 1. Place the stainless steel fiber felt in a vacuum sintering furnace at a vacuum degree of ≤1×10 -2 Under the condition of Pa, the stainless steel fiber felt is heated up to 500°C at a heating rate of 10°C / min, and then kept for 30min for low-temperature sintering treatment, and the low-temperature sintered felt is obtained after natural cooling; the stainless steel fiber in the stainless steel fiber felt is preferably made of bundled 316L stainless steel fiber prepared by drawing method, the fiber diameter is 28 μm;

[0029] Step 2. Use a hydraulic press to compress the low-temperature sintered felt in step 1 to a porosity of 83%, and then place the compressed low-temperature sintered felt in a vacuum sintering furnace at a vacuum degree ≤ 1×10 -2 Under the condition of Pa, the compressed low-temperature sintered felt was heated up to 1000...

Embodiment 3

[0032] The preparation method of the present embodiment stainless steel fiber sintered felt comprises the following steps:

[0033] Step 1. Place the stainless steel fiber felt in a vacuum sintering furnace at a vacuum degree of ≤1×10 -2 Under the condition of Pa, the stainless steel fiber felt is heated up to 600°C at a heating rate of 20°C / min, and then kept for 30min for low-temperature sintering treatment, and the low-temperature sintered felt is obtained after natural cooling; the stainless steel fiber in the stainless steel fiber felt is preferably made of bundled 316L stainless steel fiber prepared by drawing method, the fiber diameter is 60 μm;

[0034]Step 2: Use a hydraulic press to compress the low-temperature sintered felt in step 1 to a porosity of 80%, and then place the compressed low-temperature sintered felt in a vacuum sintering furnace at a vacuum degree ≤ 1×10 -2 Under the condition of Pa, the compressed low-temperature sintered felt was heated up to 1000°...

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Abstract

The invention provides a preparation method for stainless steel fiber sintered felt. The preparation method comprises the following steps that firstly, stainless steel fiber felt is put in a vacuum sintering furnace, the stainless steel fiber felt is heated up to 300 DEG C-600 DEG C under vacuum conditions, and then the temperature is kept for 30 min-120 min, low temperature sintering treatment is conducted, low temperature sintered felt is obtained after natural cooling; and secondly, the low temperature sintered felt is compressed to be 60%-95% in porosity by adopting a hydraulic press, then the compressed low temperature sintered felt is put in the vacuum sintering furnace, the compressed low temperature sintered felt is heated up to 900 DEG C-1000 DEG C under vacuum conditions, then the temperature is kept for 1 min-30 min, high temperature sintering treatment is conducted, and the stainless steel fiber sintered felt is obtained after natural cooling. According to the preparation method for the stainless steel fiber sintered felt, not only is firm metallurgical bonding among fibers achieved, but also coarsening of crystal grains inside the fibers is avoided, so that the mechanical property of the stainless steel fiber sintered felt is improved.

Description

technical field [0001] The invention belongs to the technical field of stainless steel materials, and in particular relates to a preparation method of stainless steel fiber sintered felt. Background technique [0002] Stainless steel fiber sintered felt is a multifunctional lightweight porous material, which is widely used in filtration and separation, sound absorption and noise reduction, impact energy absorption and other fields. Its tensile and compressive properties directly affect the reliability during service. However, at present, this material has disadvantages such as low fracture strength and poor compression energy absorption capacity, which restrict its application in various harsh service conditions. [0003] The key production process of stainless steel fiber sintered felt includes air-flow felting process and high-temperature sintering process. The latter is a key step to ensure the formation of metallurgical bonding between metal fibers and the mechanical pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F5/10
Inventor 马军汤慧萍李爱君许忠国王建忠支浩敖庆波
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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