中文摘要：

采用WC／Fe／A1混合粉末，通过机械合金化制备40v01％WC／Fe（AI）固溶体复合粉末，利用冷喷涂沉积涂层并结合热处理原位反应制备了WC／FeAl金属问化合物基金属陶瓷涂层。研究了球磨时间对复合粉末相结构、晶粒尺寸及组织结构的影响，并分析了冷喷涂WC／FeAI金属问化合物基金属陶瓷涂层的组织和显微硬度。结果表明，机械合金化可获得WC陶瓷颗粒呈微／纳米多尺度分布的WC／Fe（AI）金属陶瓷复合粉末，球磨36h的复合粉末基体相平均晶粒尺寸约为90mm，冷喷复合涂层组织致密、多尺度WC颗粒在基体中均匀弥散分布，涂层显微硬度约为1060HV0．3，涂层在650℃热处理后发生Fe（A1）同溶体向FeAl金属间化合物的原位转变，制备出了WC／FeAl金属间化合物基金属陶瓷涂层。

英文摘要：

40vo1% WC/Fe （AI） solid solution composite powder was prepared by mechanical alloying of WC/Fe/A1 mixture powder and WC/ FeAl intermetallic compound based cermet coating was successfully fabricated by cold spraying of ball milled composite powder and assisted by post spraying annealing treatment. Effect of ball milling time on the phase structure, grain size and microstructure of composite powder were investigated. The microstructure characteristics and microhardness of cold sprayed WC/FeAI cermet coating were analyzed. The results show that the WC/Fe（A1） solid solution composite powder uniformly distributed with micro and nano meter scale WC hard phase particles can be prepared by mechanical alloying. The mean grain size of matrix phase in the composite powder is about 90 nm after 36 h ball milling. A dense WC/FeAI cermet coating uniformly distributed with multi-scale WC panicles has been obtained by cold spraying and its microhardness is about 1060 HV0.3. The in-situ phase transformation from Fe（AI） solid solution to FeA1 intermetallic compound occures in coating after annealing at 650 ~C. Therefore, A WC/FeA1 intermetallic compound based cermet coating is successfully prepared.