成分分布均勻性的影響
(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室,
湖南省納米材料工程技術(shù)聯(lián)合研究中心, 長沙 410083)
摘 要: 添加過程控制劑(PCA)大大提高了機(jī)械合金化粉末中不同元素粉末的成分分布的均勻性, 大大改變了粉末形貌特征。 PCA種類對機(jī)械合金化粉末的SEM形貌特征和成分分布的均勻性有較大的影響。 與不添加PCA相比, 固體介質(zhì)PCA對進(jìn)一步細(xì)化粉末粒度、 提高成分均勻分布、 降低粉末團(tuán)聚和減少夾雜有一定作用, 但效果不如液體介質(zhì)PCA顯著, 此時粉末形貌呈等軸狀或棒狀。 采用液體PCA所制備的粉末形貌呈薄片狀或針狀。
關(guān)鍵字: 機(jī)械合金化; 納米粉末; 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


