成分分布均匀性的影响
(中南大学 粉末冶金国家重点实验室,
湖南省纳米材料工程技术联合研究中心, 长沙 410083)
摘 要: 添加过程控制剂(PCA)大大提高了机械合金化粉末中不同元素粉末的成分分布的均匀性, 大大改变了粉末形貌特征。 PCA种类对机械合金化粉末的SEM形貌特征和成分分布的均匀性有较大的影响。 与不添加PCA相比, 固体介质PCA对进一步细化粉末粒度、 提高成分均匀分布、 降低粉末团聚和减少夹杂有一定作用, 但效果不如液体介质PCA显著, 此时粉末形貌呈等轴状或棒状。 采用液体PCA所制备的粉末形貌呈薄片状或针状。
关键字: 机械合金化; 纳米粉末; 粉末特性
(State Key Laboratory for Powder Metallurgy, Hunan Nano-Material Co-Research Center,Central South University, Changsha 410083, China)
Abstract:The influences of process control agents(PCA) on W-Ni-Fe morphology structure and the homogeneity of W, Ni, Fe elements distribution were investigated. The results show that PCA and PCA type have great effects on SEM morphology characteristics and elements distribution. PCA improves the homogeneity of W, Ni, Fe distribution greatly. In comparison with no PCA, solid PCA plays some important role in refining particle size, decreasing agglomeration and inclusion, but the effects is not dominant as using liquid PCA. The powder morphology by using solid PCA looks like equal-axis or rod shape, the morphology by using liquid PCA looks like flimsy slice or needle shape.
Key words: mechanical alloying; nano-structured powder; powder characteristics