STUDY OF COMPRESSION PROCESS OF NANOSIZED WC-Co HARDMETAL POWDER
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摘要: 采用普通模压方法，压制了用高能球磨（机械合金化）法制备的纳米硬质合金粉末，研究了压坯密度与压制压力之间的关系，并与普通微米硬质合金进行了比较，结果表明：纳米硬质合金的压坯密度低于微米硬质合金的压坯密度，随球磨时间的延长压坯密度有下降的趋势；VC的存在使压坯密度下降；从实验数据回归出的压制方程来看，纳米粉末的硬化指数低于微米粉末的硬化指数，而压制模数却远高于微米硬质合金的，表明纳米硬质合金粉末的硬化趋势不大，但摩擦力及由此引起的压力损失是相当大的。Abstract: Nanosized WC-Co hardmetal powder prepared by attrition mill method (mechanical alloying) is compacted by die pressing. A preliminary study has been performed regarding to the relation between powder green density and pressing pressure, which is compared with microsized WC-Co powder. The results show that green density of nanosized powder is lower than that of microsized powder. Green density of nanosized powder decreases with the increase of milling time. VC in nanosized powder makes green density decrease. In compression equation, m of nanosized powder is lower than that of microsized powder, and die pressing factor of nanosized powder is much higher than that of microsized powder.
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