Tungsten Copper Composites Powder Prepared from Ammonium Paratungstate

Tungsten copper alloy is prepared by tungsten and copper, which belongs to a metal sweating material. Tungsten copper alloy has the properties of both tungsten and copper, with uniform microstructure and high temperature resistance, strength, density and resistance to arc erosion and so on. Tungsten/ copper alloy is used in fields of military and nuclear fusion because of the moderate electric and heat conduction it has.



The preparation process of the tungsten copper alloy is generally prepared in the following five steps: preparing tungsten copper powder→mixed ingredients→pressing process→sintering and dissolution→cold working.
Using ammonium paratungstate and copper nitrate as raw material, improved traditional way to prepare tungsten copper composites powder -- Spray Drying Hydrogen Reduction Method, and reduce process of spray drying. And prepared the final product with only phase of tungsten and copper, also particles of tungsten will keep in the initial size.

The preparation processes are as follows:
1. Mixing water, copper nitrate, tartaric acid, ammonium paratungstate and citric acid according to a certain proportion, stirring under the temperature of 50 ~ 60℃for at least 5 hours, then get mixed liquor;
2. Adding polyethylene glycol to the liquor prepared step 1 and stirring under the temperature of 60~70℃ until it turns to gel;
3. placing the gel in 100 ~ 120℃ to dry for at least 12 hours, then get gel dried;
4. Arrange the dry gel orderly on 290 ~ 310℃ for 3.5 ~ 4.5 hours, then 540 ~ 560 ℃ for 4.5 ~ 5.5 hours, to obtain an intermediate product;
5. Reducing the intermediate product in reduction gas at 760~800℃for more than 3 hours, and tungsten copper composites powder prepared.

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