摘要：利用自行设计的高能机械化学球磨机,在室温下通过使钼粉在NH3气氛下高能球磨得到了超微氮化钼粉体。XRD和SEM分析表明,在球料比仅为8:1的情况下,经过30 h球磨,粉体平均粒度在100nm以内。机械化学反应过程中,氨气分子在钼金属清洁表面的化学吸附起着重要的作用,球磨过程中介质球碰撞储存于钼粉中的能量则提供了Mo-N化学吸附向氮化钼转变所需的激活能。在Mo与NH3的高能机械化学反应过程中,球磨转速的高低对整个反应的速度很大的影响。
关键词： 高能机械化学法；超微粉体；氮化钼
Abstract: Using the high-energy mechanochemistry ball mill of self-designing, the ultramicro molybdenum nitride powder was prepared through the reaction of molybdenum and ammonia at room temperature . The ratio of grinding media to material was 8:1. After 30 hours of milling, the average particle size was within 100 nm. The chemisorption of ammonia onto the fresh molybdenum surfaces created by milling was the dominated processes govering solid- gas reaction. While the energy input due to introduction of high density ofgrain-boundaries and lattice defects offered the activation energy for the transition from Mo- N chemisorption to molybdenum nitride. The rotational speed of milling plays a critical role in the reaction speed of mechanochemistry process.
Keywords: high-energy mechanochemistry method; ultrafine powder; molybdenum nitride
