【摘要】 采用高能球磨工艺对WC粉体进行超细研磨。研究了粉体颗粒度及晶粒度的大小随球磨时间的变化关系。发现随球磨时间的增加 ,粉体颗粒度不断细化 ,最后趋于稳定 (0 .4μm) ;粒度分布曲线出现明显的三峰特征 ,分别位于细 (微米 )区、超细 (亚微米 )区和极细 (纳米 )区。研磨细化的WC粒子具有纳米晶 (1 0nm)结构。探讨了WC粉体高能球磨细化机理与纳米晶结构特性。更多还原

【Abstract】 The ultrafine tungsten carbide was prepared directly from micrograded raw products by high energy ball milling. The average particle size reaches its minimum at 0.4 μm after milling for 80 h, while the crystallite size reaches 10 nm. It means the as prepared WC particles are nanostructured. It is found that the size distribution patterns have three peaks, locating around 0.2 μm, 0.6 μm and 2.0 μm respectively, and the strongest peak locates around 0.6 μm, which shows a characteristic trituration mechanism that the crystallite size of initial WC determines the final grain size.更多还原