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Process for sintering and infiltration preparation of tungsten chrome-copper composite materials

A composite material and infiltration technology, applied in contact materials and other directions, can solve the problems of high oxygen content and low density of tungsten-chromium-copper composite materials, and achieve low oxygen content, stable material structure and performance, and easy process. control effect

Inactive Publication Date: 2006-11-22
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the shortcomings of low density and high oxygen content of tungsten-chromium-copper composite materials produced by powder metallurgy, the purpose of the present invention is to provide a sintering infiltration method for manufacturing tungsten-chromium-copper composite materials. Tungsten chromium-copper composite material, uniform structure, excellent performance, easy to control the manufacturing process

Method used

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  • Process for sintering and infiltration preparation of tungsten chrome-copper composite materials
  • Process for sintering and infiltration preparation of tungsten chrome-copper composite materials
  • Process for sintering and infiltration preparation of tungsten chrome-copper composite materials

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Take 50% tungsten powder with a particle size of 4-10 μm and 11% chromium powder with a particle size of 45-100 μm by weight, mix the powder in the mixer for 2 hours to make it uniform, and the speed of the mixer is 60 rpm / point;

[0023] (2) Use 8% alcohol paraffin solution to make the uniform powder into a powder of 1 to 2 mm;

[0024] (3) Molding the granulated powder with a pressure of 460Mpa to make a blank;

[0025] (4) Put the pressed billet into the sintering furnace, raise the temperature to 650°C in a reducing atmosphere, and reduce it for 40 minutes, with a heating rate of 18°C / min;

[0026] (5) Vacuum to 1.5×10 -3 When Pa, continue to heat up to 1260 ° C, the heating rate is 12 ° C / min, add 39% copper liquid in the crucible by weight percentage, reduce sintering and infiltrate copper for 1.5 hours;

[0027] (6) Cool to 200°C, and release the fired billet;

[0028] (7) Homogenize the above blank at 1060°C for 40 minutes;

[0029] (8) Aging treatme...

Embodiment 2

[0034] (1) Take 32% of tungsten powder with a particle size of 4-10 μm and 23% of chromium powder with a particle size of 45-100 μm by weight, mix the powder in the mixer for 3.5 hours to make it uniform, and the speed of the mixer is 45 rpm / point;

[0035] (2) Use 6% alcohol paraffin solution to make the uniform powder into 1-2 mm powder;

[0036] (3) Carry out cold isostatic pressing to the powder material after granulation, pressure 300Mpa, make blank;

[0037] (4) Put the pressed billet into the sintering furnace, raise the temperature to 980° C. under a reducing atmosphere, and reduce it for 90 minutes, with a heating rate of 22° C. / min;

[0038] (5) Vacuumize to 2.5×10 -2 When Pa, continue to heat up to 1300 ° C, the heating rate is 16 ° C / min, add 45% copper liquid in the crucible by weight percentage, reduce sintering and infiltrate copper for 2.5 hours;

[0039] (6) Cool to 250°C, and release the fired billet;

[0040] (7) Homogenize the above blank at 950°C fo...

Embodiment 3

[0046] (1) Take 50% tungsten powder with a particle size of 4-10 μm and 23% chromium powder with a particle size of 45-100 μm by weight, mix the powder in the mixer for 3 hours to make it uniform, and the speed of the mixer is 55 rpm / point;

[0047] (2) Use 8% alcohol paraffin solution to make the uniform powder into a powder of 1 to 2 mm;

[0048] (3) Molding the granulated powder with a pressure of 580MPa to make a blank;

[0049] (4) Put the pressed billet into the sintering furnace, raise the temperature to 600°C in a reducing atmosphere, and reduce it for 80 minutes at a heating rate of 20°C / min;

[0050] (5) Vacuum to 3.2×10 -3 When Pa, continue to heat up to 1200 DEG C, the heating rate is 14 DEG C / min, add 27% copper liquid in the crucible by weight percentage, reduce sintering and infiltrate copper for 2 hours;

[0051] (6) Cool to 220°C, and release the fired billet;

[0052] (7) Homogenize the above blank at 1000°C for 100 minutes;

[0053] (8) Aging treatment...

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PUM

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Abstract

A sintering and infiltration method for manufacturing tungsten-chromium-copper composite materials. The tungsten-chromium-copper composite materials are composed of the following components by weight percentage: tungsten 32%-50%, chromium 11%-23%, copper 27%-57% , the sum of the weight of each component is 100%. The method includes the following steps: first mix tungsten powder and chromium powder, granulate, press into a billet, then sinter and infiltrate copper liquid, after homogenization treatment and aging treatment be made of. The manufacturing method and process are easy to control, and the prepared tungsten-chromium-copper composite material has stable structure and performance, high density, low oxygen content, moderate hardness, high electrical conductivity, and excellent mechanical and electrical comprehensive performance.

Description

technical field [0001] The invention relates to a method for manufacturing tungsten-chromium-copper composite material, in particular to a sintering infiltration method for manufacturing tungsten-chromium-copper composite material. Background technique [0002] The current method of manufacturing tungsten-chromium-copper composite materials is powder metallurgy. In this method, the reduction temperature of chromium powder is low and the reduction is insufficient, resulting in high oxygen content in the material. The tungsten-chromium-copper composite material manufactured by this method The material has low density and many pores in the material, which affects the hardness and conductivity of the material. Contents of the invention [0003] In order to solve the shortcomings of low density and high oxygen content of tungsten-chromium-copper composite materials produced by powder metallurgy, the purpose of the present invention is to provide a sintering infiltration method ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C30/02H01H1/02C22C1/04C22C30/00
Inventor 范志康肖鹏梁淑华
Owner XIAN UNIV OF TECH
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