(1. 兰州理工大学 甘肃省有色金属新材料省部共建国家重点实验室，兰州 730050；
(2. 兰州理工大学 有色金属合金省部共建教育部重点实验室，兰州 730050)
摘 要: 采用化学包裹法制备MoSi2/Cu复合粉体，研究MoSi2/Cu包裹粉体的物相组成、颗粒形貌及包裹粉体的热稳定性。结果表明：复合粉体的主要物相组成为Cu、MoSi2及自发氧化生成的Cu2O；包裹颗粒呈椭球形的蛋状结构，包裹层厚度为150~400 nm，包裹效果较好；在氢气炉中于950 ℃煅烧1 h后，复合粉体主要物相为Cu和MoSi2，强化相MoSi2未与基体Cu发生反应。DSC分析表明：1 000 ℃以下复合粉体中只有Cu2Cl(OH)3和Cu2O的分解反应，复合粉体具有较好的热稳定性。
关键字: 化学包裹；MoSi2/Cu；热稳定性；复合粉体
（1. State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Lanzhou University of Technology,
Lanzhou 730050, China;
2. Key Laboratory of Non-ferrous Metal Alloys, Ministry of Education, Lanzhou University of Technology,
Lanzhou 730050, China）
Abstract: MoSi2/Cu composite powder was prepared by using chemical coating method. The phase composition, morphology and thermal stability of coating powders were investigated. The results show that the main phases in the as-fabricated sample are Cu, MoSi2 and Cu2O introduced by spontaneous oxidation reaction. The coated particles have the egg structure. The thickness of coated layer is 150−400 nm and the effect of coating is good. The coated powders were calcined in a hydrogen atmosphere furnace at 950 ℃ for 1 h, the main phases after heating are Cu and MoSi2, and there are no reactions between MoSi2 and Cu. The results of DSC analysis show that there are only decomposition reactions of Cu2Cl(OH)3 and Cu2O in the calcined sample below 1 000 ℃. MoSi2/Cu composite powder has good thermal stability.
Key words: chemical coating; MoSi2/Cu; thermal stability; composite powder
