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Microwave sintering and heat treatment method for preparing high-performance tungsten-based high-density alloy

A heat treatment method and microwave sintering technology are applied in the field of preparing high-performance tungsten-based high-density alloys, which can solve the problems of cost increase and prolongation of production cycle, and achieve the effects of reduced hydrogen content, easy process, and uniform fine-grained structure

Inactive Publication Date: 2012-03-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires heat treatment in a vacuum furnace, and prolongs the production cycle, increasing the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1 raw material

[0020] W, Ni, Fe powder

[0021] 2 ingredients chemical composition

[0022] W (wt%)

Ni (wt%)

Fe(wt%)

93

4.9

2.1

[0023] 3 preparation process

[0024] ① Mix W powder with a purity greater than 99.5% and an average particle size of 1.98 μm, Ni powder with a purity greater than 99.5% and an average particle size of 2.3 μm, and Fe powder with a purity greater than 99.5% and an average particle size of 2.3 μm according to mass percentages, with a ball-to-material ratio of 1 : 1, rotating speed 100rpm, mix in stainless steel ball mill cylinder for 6h, take out and press into compact;

[0025] ②Alumina fiber is used as the insulation body, and SiC is added in the insulation body as an auxiliary heating material, and the compact is placed in the sheath and placed in the cavity of the microwave high-temperature furnace;

[0026] ③Use a vacuum pump to discharge the air in the microwave oven cavity, and then pa...

Embodiment 2

[0032] 1 raw material

[0033] W, Ni, Cu

[0034] 2 ingredients chemical composition

[0035] W (wt%)

Ni (wt%)

Cu(wt%)

90

7

3

[0036] 3 preparation process

[0037] ① Mix W powder with a purity greater than 99.5% and an average particle size of 1.98 μm, Ni powder with a purity greater than 99.5% and an average particle size of 2.3 μm, and Cu powder with a purity greater than 99.5% and an average particle size of 9.0 μm according to mass percentages, with a ball-to-material ratio of 2 : 1, rotating speed 150rpm, mix 6h in the stainless steel ball mill barrel, take out and press into compact;

[0038] ②Use alumina fiber blocks as the insulation body, add SiC in the insulation body as auxiliary heating material, place the compact in the sheath, and put it into the cavity of the microwave high-temperature furnace;

[0039] ③Use a vacuum pump to discharge the air in the microwave oven cavity, and then pass it in with a volume fractio...

Embodiment 3

[0044] 1 raw material

[0045] W, Ni, Fe, Mo powder

[0046] 2 ingredients chemical composition

[0047] W (wt%)

Ni (wt%)

Fe(wt%)

Mo (wt%)

78

4.9

2.1

15

[0048] 3 preparation process

[0049] ① W powder with a purity greater than 99.5% and an average particle size of 1.98 μm, Ni powder with a purity greater than 99.5% and an average particle size of 2.3 μm, Fe powder with a purity greater than 99.5% and an average particle size of 2.3 μm, and Fe powder with a purity greater than 99.5% and an average particle size of 3 μm Mo powder is batched according to mass percentage, with a ball-to-material ratio of 2:1 and a rotating speed of 200rpm, mixed in a stainless steel ball mill for 5 hours, and pressed into a compact after being taken out;

[0050] ②Alumina fiber is used as the insulation body, SiC is added as the auxiliary heating material in the insulation body, and the compact is placed in the sheath

[0051] Put it in...

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Abstract

A microwave sintering and heat treatment method for preparing high-performance tungsten-based high-density alloy comprises the following steps: preparing a powder compact by a traditional powder metallurgy method, putting the compact in a microwave high-temperature furnace with atmosphere protection and a vacuum pump, controlling the atmosphere in the furnace chamber to be reducing atmosphere at a heating phase below 1200 DEG C; sintering the product at low vacuum at a high-temperature phase of 1200-1400 DEG C, and vacuumizing the furnace to obtain a high vacuum of 10-2 Pa at a cooling phase after sintering. The obtained alloy has a uniform fine grain structure, and high mechanical properties. The invention adopts low vacuum at the sintering phase, and adopts high vacuum at the cooling phase, which allow the hydrogen content of the alloy to be reduced, and effectively avoid the hydrogen embrittlement phenomenon. Additionally, the tungsten-based high-density alloy is prepared by microwave sintering technology and equipment, which is rapid, high-efficient, simple, and low in cost; the tungsten-based high-density alloy is prepared by microwave sintering-heat treatment technology; theprocess is easy to control; the technology is mature, and is applicable to industrial production.

Description

Technical field: [0001] The invention relates to a method for preparing a high-performance tungsten-based high-density alloy by using microwave sintering technology; in particular, it relates to a method for rapidly preparing a tungsten-based high-density alloy by using microwave high-temperature heating equipment with atmosphere control. Background technique [0002] Tungsten-based high-density alloy has high density, high strength, good ductility, good toughness, small thermal expansion coefficient, strong radiation absorption ability, good thermal conductivity and corrosion resistance, as well as excellent machinability and weldability, and is widely used Used in inertial components, counterweight components, and anti-ray shielding components, it is widely used in cutting-edge scientific fields, defense industry and civilian industry. With the advancement of science and technology and the development of advanced industries, higher and higher requirements are placed on the...

Claims

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Application Information

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IPC IPC(8): C22C27/04C22C1/04
Inventor 易健宏周承商罗述东彭元东李丽娅
Owner CENT SOUTH UNIV
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