Tungsten copper alloy preparation method

The present invention provides a copper mass percentage of 25% to 40% margin for the preparation of tungsten tungsten copper alloy, concrete steps are as follows:

A) the percentage by mass of 5% to 20% copper, copper tungsten alloy and tungsten and having the same mass percent tungsten powder uniformly mixed 8 hours to 16 hours;

B) in the mixture of 180 Mpa ~ 200Mpa molded under pressure to obtain a green compact;

C) The compact is placed in a hydrogen furnace for pre-sintering, the sintering temperature of 900 ~ 1000 ℃, for 0.5 hour to 1 hour to obtain a copper tungsten alloy frame;

D) by measuring the quality of pre-sintered compacts M, calculate the volume porosity V λ = (1-M / V / ρ ↓ [blank]), and then calculate the amount of infiltration of copper = λ × V × ρ ↓ [Cu ], where ρ ↓ [blank] compacts with the same composition as the theoretical density tungsten-copper alloy, ρ ↓ [Cu] is the theoretical density of copper;

Copper infiltration amount (1.1 to 1.2) times the copper 5) will be in step (4) molded into the calculation of the same size with the copper surface of the skeleton;

E) The copper tungsten copper alloy frame is placed above and aligned, into the graphite crucible, alumina landfill, heated to 1350 ~ 1400 ℃ for copper infiltration, i.e., for 1 to 3 hours to give a percentage by mass of copper is 25 % ~ 40%, the balance being copper tungsten, tungsten alloy.

Tungsten copper alloy of the present invention provides a method for preparing a high copper content in the obtained tungsten-copper alloy which has more than 98% of high density, high conductivity, and electrical contacts suitable for electrode materials, electronic packaging materials, high temperature materials, such as sweating .


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