Preparation of nano crystal tungsten-cobalt alloy composite powder

A process for synthesizing the composite powder of hard nanocrystal WC-Co alloy by use of reaction heat features that the activated composite powder of W.C and Co is prepared by high-energy ball grinding while the excessive energy supplied externally to the system is converted to the energy needed by the solid reaction to synthesize nano-crystal WC, whose size of crystal grain can be flexibly regulated in wide temprange. Its advantages are high size stability in sintering, small size of WC crystal grain (42 nm) and no environmental pollution. 一种合成纳米晶钨钴硬质合金复合粉末的方法。本发明利用反应热处理技术合成烧结稳定性较高和满足纳米晶硬质合金烧结要求的WC-Co复合粉末。即利用高能球磨技术制造W、C、Co活化态复合粉末，外界输入到体系的过剩能量部分转化成随后合成纳米晶WC的固态反应所需的能量。本发明制得的复合粉末中的WC晶粒尺寸可以在很宽的温度范围内进行灵活调整；利用本发明，降低了纳米WC-Co复合粉末颗粒的过高烧结活性，提高了纳米WC晶粒在烧结过程中的尺寸稳定性，在1100℃经过30分钟处理后，纳米WC晶粒尺寸仅为42nm；克服了现有工艺中存在的环境污染问题，便于工业化规模生产。