Fine-grained Non-magnetic Tungsten - copper Alloys Activated Sintering Method of Preparation

The present invention provides a fine-grained non-magnetic tungsten - copper alloy activation sintering method. Characterized in that:

Tungsten-copper composite powder as raw material, and then molded tungsten copper powder required for the body shape, and then by cold isostatic pressing process, the preparation of a relative density of 50% -70% of the body, the body is placed a sintering furnace under a hydrogen atmosphere or a mixed atmosphere of hydrogen and a protective atmosphere, a protective atmosphere of high purity nitrogen or argon, and then a heating rate of 5 ℃ / min to a temperature of raw 375-400 ℃, extrusion molding incubated 1 hour agents, the final low temperature activation sintering.

Among them, the low temperature activation sintering process requirements are as follows:

1) at a heating rate of 5 ℃ / min up from 375-400 ℃ to 800 ℃, incubated for 1 hour;

2) at a heating rate of 5 ℃ / min up to 800 ℃ to 900 ℃, incubated for 1 hour;

3) at a heating rate of 1 ℃ / min up to 900 ℃ from 1090 ℃;

4) at a heating rate of 3 ℃ / min up to the sintering temperature from 1090 ℃ 1100-1340 ℃, holding time of 40-60 minutes;

5) when the temperature is lowered to 1000 ℃, the through-the high-purity argon gas or nitrogen gas atmosphere for one kind of to eliminate influence of hydrogen embrittlement, the furnace was cooled to room temperature.

Prepared by the invention of high-density tungsten - copper alloys have excellent mechanical properties and thermal conductivity, effectively preventing the copper segregation, with fine grain size, high strength, high ductility and thermal conductivity.

The invention process is simple, easy to control, no pollution, low investment cost, low power consumption, suitable for industrial scale production.


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