(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 采用高能球磨法对工业钼粉进行活化预处理，研究高能球磨对活化钼粉形貌及其物理性能的影响，分析其烧结致密化行为及活化机理，并与工业纯钼粉烧结致密化行为进行对比。结果表明：机械高能球磨使工业钼粉得到有效活化，获得额外界面能和晶格畸变能，可显著降低其致密化烧结温度。经高能球磨化，粉末在1300 ℃烧结能达到较高的相对密度(95%)和硬度(450 HV)，远优于工业钼粉烧结样(83%，90 HV)。
关键字: 高能球磨；机械活化；低温烧结；致密化
（School of Material Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The commercial molybdenum powder was activated by the pretreatment of high-energy ball milling, the effects of ball milling time on its morphology as well as physical characteristics were studied, and the corresponding sintering densification behavior and activation mechanism were also investigated, which was compared with that of the commercial molybdenum pure molybdenum powder. The results show that the commercial molybdenum powder has been effectively activated by mechanical high-energy ball milling and obtained additional surface energy and lattice distortion energy, leading to the significant reduction of sintering densification temperatures. Sintered at 1300 ℃, the obtained billets achieve a high relative density of 95% and microhardness of 450 HV, much larger than those of commercial molybdenum powder(83%, 90 HV).
Key words: high-energy ball milling; mechanical activation; low-temperature sintering; densification
