【摘要】 特粗晶硬质合金是一类发展中的先进矿业用硬质合金。采用纳米粉末溶解法制备特粗晶硬质合金,得到WC平均晶粒尺寸为8~9μm的特粗WC-Co硬质合金,研究发现纳米粉末可通过扩散机制控制小晶粒粗化。此方法不仅使WC平均晶粒尺寸增加,而且使WC-Co硬质合金的WC晶粒尺寸分布的均匀性得到提高;同时复杂形状晶粒明显减少,晶粒发育得到改善。更多还原

【Abstract】 Ultra coarse grain cemented carbide is a kind of developing and advanced cemented carbide for mining tools.Dissolution method of nanometer powder was used to prepare extraordinarily coarse grain cemented carbide with an average grain size of 8 9 μm in the paper.The results show that coarsening of the fine WC grains is controlled by diffusion of nanometer powder.This method leads to not only increase in average grain size of WC,but also high homogeneity of WC grain size distribution.Moreover,the number of complicated shape grains decreases and crystallization of the WC grains improves.更多还原