(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 采用高能球磨法對工業(yè)鉬粉進(jìn)行活化預(yù)處理，研究高能球磨對活化鉬粉形貌及其物理性能的影響，分析其燒結(jié)致密化行為及活化機(jī)理，并與工業(yè)純鉬粉燒結(jié)致密化行為進(jìn)行對比。結(jié)果表明：機(jī)械高能球磨使工業(yè)鉬粉得到有效活化，獲得額外界面能和晶格畸變能，可顯著降低其致密化燒結(jié)溫度。經(jīng)高能球磨化，粉末在1300 ℃燒結(jié)能達(dá)到較高的相對密度(95%)和硬度(450 HV)，遠(yuǎn)優(yōu)于工業(yè)鉬粉燒結(jié)樣(83%，90 HV)。
關(guān)鍵字: 高能球磨；機(jī)械活化；低溫?zé)Y(jié)；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
