A method for preparing ultrafine tungsten-copper composite powder
A composite powder, tungsten copper technology, applied in the field of alloy materials, can solve the problems of high cost, complicated process, easy introduction of impurities, etc., and achieve the effect of low cost and simple operation
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example 1
[0013] Example 1: To prepare W-30% Cu alloy, the mass ratio of tungsten to copper in ammonium tungstate and copper nitrate is uniformly mixed according to 7:3. Then put this raw material into a high-temperature furnace under an air atmosphere, heat up to 400° C. with the furnace, keep it warm for 4 hours, and then cool it in an air atmosphere. Carbon distribution follows the following rules: WO 3 and for restoring WO 3 The molar ratio of carbon black is 1:2; the molar ratio of CuO and carbon black used to reduce CuO is 1:0.5. After uniform mixing, react at 600°C for 2 hours under an argon atmosphere, and then react at 1000°C for 2 hours. hours, and then cooled under argon atmosphere to obtain W, Cu and a small amount of WO 2 mixture. Then the carbothermal pre-reduced product was kept at 800°C for 4 hours in a hydrogen atmosphere, and cooled to room temperature in a hydrogen atmosphere to obtain a tungsten-copper composite powder with a particle size of less than 200nm.
example 2
[0014] Example 2: To prepare a W-10% Cu alloy, the mass ratio of tungsten to copper in ammonium tungstate and copper nitrate is uniformly mixed according to 90:10. Then put the raw material into a high-temperature furnace and heat it up to 500° C. in an air atmosphere, keep it warm for 4 hours, and then cool it in an air atmosphere. Carbon distribution follows the following rules: WO 3 and for restoring WO 3 The molar ratio of carbon black is 1:2.1; the molar ratio of CuO and carbon black used to reduce CuO is 1:0.5. After uniform mixing, react at 600°C for 2 hours under an argon atmosphere, and then react at 1000°C 2 hours, and then cooled under argon atmosphere to obtain W, Cu and a small amount of WO 2 mixture. Then, the carbothermally pre-reduced product is kept at 850° C. for 2 hours in a hydrogen atmosphere, and cooled in a hydrogen atmosphere to obtain a tungsten-copper composite powder with a particle size of less than 200 nm.
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