Preparation of Ultra-fine Grain Tungsten-copper Alloy

The present invention provides an ultra-fine grain tungsten copper alloy preparation. Specific steps are as follows:

1) Preparation of tungsten-copper composite powder tungsten oxide and ammonium nitrate as the raw material of copper, copper nitrate was first dissolved in deionized water to form a solution, a copper nitrate solution and then concentrated nitric acid solution of ammonium tungstate was added while stirring was continued 30 ~ 90min, then the precipitate was removed at 150 ~ 400 ℃ calcined 2 ~ 4h, and after grinding to obtain tungsten-copper composite oxide powder;

2) Reduction of tungsten-copper composite powder tungsten oxide copper oxide composite powder drainage pipe in breathable strong hydrogen reduction furnace to obtain a uniform dispersion of nano-tungsten-copper composite powder, reducing the temperature of 650 ~ 750 ℃, reducing time 1 ~ 1 .5h, hydrogen flow rate 25 ~ 45ml / min.cm2;

3) The above press forming tungsten-copper composite powder press molding for compacts, unit pressure 100 ~ 250MPa;

4) sintering of ultra-fine grain tungsten copper alloy obtained in step 3 compacts were hydrogen sintering at 1150 ~ 1250 ℃, holding time of 90 to 120 minutes, after ultra-fine grain sintered tungsten-copper alloy.


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