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Method for preparing metal fiber sintered felt by spark plasma sintering

A technology of discharge plasma and metal fiber felt, applied in the field of preparation of metal sintered fiber felt, to achieve high air permeability, controllable porosity, and high porosity

Active Publication Date: 2019-01-11
HUNAN HUITONG ADVANCED MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But so far there is no record of directly using spark plasma sintering to prepare porous metal materials; especially there is no record of directly using spark plasma sintering to prepare a metal fiber sintered felt with a porous structure, excellent air permeability and excellent mechanical properties

Method used

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  • Method for preparing metal fiber sintered felt by spark plasma sintering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation process of the metal sintered felt of the present embodiment comprises the following steps:

[0025] Step 1. The raw material adopts a grammage of 300g / m 2 Stainless steel fiber felt, the fiber diameter is 20μm, the fiber length is 30mm, and the stainless steel fiber density is 8.00g / cm 3 .

[0026] Step 2. Put the stainless steel fiber felt and 0.31mm thick stainless steel metal ring gasket in the step 1 into the graphite mold, and send them into the spark plasma sintering furnace together. The stacking thickness of the stainless steel fiber felt is 0.60-0.80 mm.

[0027] Step 3: Close the furnace, perform pre-pressurization treatment (pressure 2MPa), vacuumize, heat up to 1000°C at 100°C / min, keep warm for 10min, cool to room temperature after sintering, and take out the stainless steel fiber sintered felt.

[0028] The porosity of the stainless steel fiber mat prepared in this example is 88%, the air permeability is basically the same as that of th...

Embodiment 2

[0030] Other conditions are the same as in Example 1, except that carbon paper is placed on the contact surface of the upper die, lower die, and metal ring with the metal felt to be sintered or on the contact surface.

[0031] The porosity of the stainless steel fiber mat prepared in this example is 90%, and the air permeability value and the maximum tensile force value are basically the same as those obtained in Example 1.

[0032] Repeat embodiment 1 and embodiment 2 each 500 times; embodiment 2 does not need to be replaced in the repeating process, and product quality is stable; To use, only replace the mold. Simultaneously embodiment 1 is in the process of repeating 150 times, and the number of times that metal felt is bonded on the mold is 5 times; But embodiment 2 does not have this phenomenon.

Embodiment 3

[0034] The preparation process of the metal sintered felt of the present embodiment comprises the following steps:

[0035] Step 1, the raw material adopts a grammage of 450g / m 2 Fe-Cr-Al fiber felt with a fiber diameter of 30 μm, a fiber length of 30 mm, and a Fe-Cr-Al fiber density of 7.20 g / cm 3 .

[0036] Step 2. Put the iron-chromium-aluminum fiber felt in step 1 and the 0.63mm stainless steel metal ring gasket into the graphite mold together, and send them into the spark plasma sintering furnace together. The stack thickness of the stainless steel fiber felt is 1.00-1.20mm.

[0037] Step 3: Close the furnace, perform pre-pressurization treatment (pressure is 2MPa), vacuumize, heat up to 1100°C at 100°C / min, keep warm for 8min, cool to room temperature after sintering, and take out the FeCrAl fiber sintered felt.

[0038] The porosity of the Fe-Cr-Al fiber felt prepared in this example is 90%, the air permeability is basically the same as that of the vacuum sintered pr...

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Abstract

The invention relates to a preparation method of metal fiber sintered felt used in the fields of environmental protection, chemical industry, high-temperature dust removal, automobile tail gas purification, burners and the like. The preparation method comprises the steps that a sintered metal fiber felt and a conductive gasket are placed into a sintering cavity; vacuumizing is carried out; then spark plasma sintering is carried out for 5 to 15 min; cooling is carried out; products are obtained; and when the spark plasma sintering is carried out, the sintering temperature is controlled to be 900-1300 DEG C. The preparation method is the first attempt to rapidly and efficiently prepare the metal fiber sintered felt with high porosity, high air permeability and high mechanical properties by directly adopting a spark plasma sintering method. The quality of the obtained products is stable and controllable; and the operation is simple and is convenient for large-scale industrial application.

Description

technical field [0001] The invention relates to a method for preparing a metal sintered fiber mat used in the fields of environmental protection, chemical industry, high-temperature dust removal, automobile tail gas purification, burners and the like. Background technique [0002] The metal fiber sintered felt is made of metal fibers with diameters accurate to microns, which are non-woven, laminated, and sintered at high temperature. At present, the method of vacuum sintering is generally used to prepare metal fiber sintered felt. This sintering method has the disadvantages of high energy consumption and long sintering time. The spark plasma sintering method is a new type of sintering method, which has the advantages of fast heating speed, short sintering time, controllable structure, and easier densification of the sintered body. But so far there is no record of directly using spark plasma sintering to prepare porous metal materials; especially there is no record of direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/11
CPCB22F3/002B22F3/105B22F3/11
Inventor 张景鹏苏文俊
Owner HUNAN HUITONG ADVANCED MATERIALS
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