超细W-10Cu复合粉末的湿法制备及烧结体性能

Fabrication and Properties of Ultrafine W-10Cu Powders and Composite

通过湿法以仲钨酸铵和硝酸铜为原料制备了Cu的质量分数为10%、平均粒径约为250 nm的超细W-Cu复合粉末.用扫描电子显微镜(SEM)和元素分析,结果表明:还原温度对粉末的形态和纯度具有显著作用.粉末经注射成型后制成的生坯在1300℃下、H2气氛中烧结120 min后,其相对密度可达99.37%,微观组织均匀,具有较高的热导率,可达217 W/(m·K)左右,室温到600℃范围下热膨胀系数在6.0×10-6～7.8×10-6K-1之间.

W-10Cu（ by weight） ultrafine powder with particle size of about 250 nm has been synthesized by chemical method, calcination and subsequent hydrogen reduction process with reaction of ammonium paratungstate and copper salt. Scanning electron microscopy（SEM） and elemental analysis results showed that the reduced temperature has a significant effect on powder morphology and purity when sintered at 1300× for 120 min in H2 atmosphere, W-10Cu composite derived from injection molding can reach a relative density of 99.37%, and the microstructure are homogeneous. Furthermore, the sintered W-10Cu composite exhibited excellent thermal conductivity of about 217W/（m.K）, and the coefficient of thermal expansion is between 6.0×10-6 -7.8×10^-6K-1 in the temperature range of 25℃ to 600℃.