PCA对机械合金化纳米粉末的SEM结构与成分分布均匀性的影响

Influences of PCA on morphology structure and elements homogeneity of mechanical alloyed W-Ni-Fe composite powders

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。

The influences of process control agents(PCA) on W-Ni -F e 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 homog eneity of W, Ni, Fe distribution greatly. In comparison with no PCA, solid PC A 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 morphol ogy by using liquid PCA looks like flimsy slice or needle shape.