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以MoO3粉、Mo粉、Si粉及Al粉为原料,采用机械化学还原法原位合成了纳米Al2O3/Mo5Si3复合粉体,并对固态反应过程进行了探讨。结果显示,球磨30 h后复合粉体的主要物相为Mo5Si3、Mo3Si及Al2O3,反应为机械诱导的自蔓延反应;随产物中Al2O3含量增加,Si烧损增加,复合粉体中Mo3Si含量增加;复合粉体粒度较小,在1~3μm之间;含Al2O3质量分数为20%~40%的Al2O3/Mo5Si3复合粉体球磨30 h后,Mo5Si3、Mo3Si和Al2O3的晶粒尺寸在31~79.3 nm之间,产物具有纳米晶结构;1000℃退火1 h后,复合粉体没有发生物相转变,粉体具有较好的稳定性。
MoO3 powder, Mo powder, Si powder and Al powder were used as raw materials to synthesize nano-Al2O3 / Mo5Si3 composite powder in situ using mechano-chemical reduction method. The solid state reaction process was also discussed. The results showed that the main phases of the composite powders were Mo5Si3, Mo3Si and Al2O3 after ball milling for 30 h. The reaction was mechanical induced self-propagating reaction. With the increase of Al2O3 content, the Si loss increased and the content of Mo3Si in the composite powders increased. The grain sizes of Mo5Si3, Mo3Si and Al2O3 are in the range of 31-79.3 nm after milling for 30 h with Al2O3 / Mo5Si3 containing 20% ~ 40% Al2O3. , The product has a nanocrystalline structure; after annealing at 1000 ℃ for 1 h, no phase transition occurs in the composite powder, and the powder has good stability.