Method for preparing molybdenum-copper alloy

A molybdenum-copper alloy and molybdenum-copper technology, applied in the field of powder metallurgy, can solve the problems of reducing the electrical and thermal conductivity of molybdenum-copper alloys, and achieve the effects of lower sintering temperature, better powder uniformity, and shorter sintering time

Inactive Publication Date: 2010-04-28
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of the activator is equivalent to the introduction of impurity elements, which will significantly reduce the electrical and thermal conductivity of the molybdenum-copper alloy.

Method used

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  • Method for preparing molybdenum-copper alloy

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Experimental program
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Effect test

Embodiment 1

[0021] 1) Copper nitrate solution (Cu(NO 3 ) 2 ·3H 2 O content 76g) and complexing agent citric acid solution (citric acid content 50g) join ammonium molybdate solution (NH 4 ) 6 Mo 7 o 24 4H 2 O content 147g), then adjust the pH of the solution=1, heat in a water bath at 80°C under stirring conditions to form a sol, then dry at 120°C to form a gel, and finally heat and decompose at 500°C in air to form a molybdenum-copper composite oxide powder;

[0022] 2) The molybdenum-copper composite oxide powder is reduced in two steps under a hydrogen atmosphere, the first reduction temperature is 500°C, the holding time is 90min, the second step reduction temperature is 700°C, and the holding time is 90min;

[0023] 3) After compacting the molybdenum-copper composite powder in a graphite grinding tool, heat it in a spark plasma sintering device at 1200°C and 30Mpa for 2 minutes to obtain molybdenum with a density of 98.4% and an average molybdenum grain size of 0.8um copper al...

Embodiment 2

[0025] 1) with step 1) among the embodiment 1;

[0026] 2) with step 2) in embodiment 1;

[0027] 3) After compacting the molybdenum-copper composite powder in a graphite abrasive tool, heat it in a discharge plasma sintering device at 1200°C and 50Mpa for 2 minutes to obtain molybdenum with a density of 99.6% and an average molybdenum grain size of 0.9um copper alloy.

Embodiment 3

[0029] 1) Copper nitrate solution (Cu(NO 3 ) 2 ·3H 2 O content 76g) and complexing agent citric acid solution (citric acid content 50g) join ammonium molybdate solution (NH 4 ) 6 Mo 7 o 24 4H 2 O content 147g), then adjust the pH of the solution=1, heat in a water bath at 90°C under stirring conditions to form a sol, then dry at 120°C to form a gel, and finally heat and decompose at 500°C in air to form a molybdenum-copper composite oxide powder;

[0030] 2) with step 2) in embodiment 1;

[0031] 3) After compacting the molybdenum-copper composite powder in a graphite grinding tool, heat it in a spark plasma sintering device at 1150°C and 50Mpa for 0min to obtain molybdenum with a density of 95.2% and an average molybdenum grain size of 0.5um copper alloy.

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Abstract

The invention belongs to the technical field of powder metallurgy. The invention prepares molybdenum-copper alloy by the following steps: (1) adding a copper nitrate solution and a complexing agent citric acid solution into an ammonium molybdate solution, heating at the temperature of 70-95 DEG C after regulating the pH to 1-2 to form colloidal sol, drying at the temperature of 100-150 DEG C to form gel and heating and decomposing in air at the temperature of 500-600 DEG C to form molybdenum-copper composite oxide powder; (2) after keeping the molybdenum-copper composite oxide powder in hydrogen gas for heat preservation at the temperature of 500 DEG C for 90min, keeping the molybdenum-copper composite oxide powder in hydrogen gas for heat preservation at the temperature of 700 DEG C for 90min; and (3) after compacting a molybdenum-copper composite powder body in a graphite sharper, perfroming heat preservation at the temperature of 1100-1200 DEG C and the pressure of 30-50MPa for 0-5min in a discharge plasma sintering device. A preparation method provided by the invention has low sintering temperature, short sintering time, no need of powder pre-forming, energy saving and environmental protection properties, high density of an obtained product, finer and uniform size of crystal grains and little impurities.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, and in particular relates to a method for preparing molybdenum-copper alloy by adopting a sol-gel method to prepare powder, and then adopting a discharge plasma sintering (SPS) technology. Background technique [0002] Molybdenum-copper alloy is a pseudo-alloy composed of mutually insoluble metals Mo and Cu. It combines the properties of Mo and Cu, and has the advantages of high temperature resistance, ablation resistance, high thermal conductivity and low thermal expansion coefficient. It is widely used in electrical contacts, electrode materials, electronic packaging and heat sink materials, and rocket nozzles. , Aircraft throat lining and other military components. Especially compared with tungsten-copper alloys with similar functions and properties, it has a lower density and is more in line with the requirements of special fields such as aerospace. [0003] Due to the great diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/04C22C9/00C22C27/04C22C30/02B22F9/22
Inventor 王金淑刘伟赵明李洪义周美玲左铁镛
Owner BEIJING UNIV OF TECH
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