激光熔覆TiC/Al_3Ti复合材料涂层的高温氧化行为研究  

Study on High-temperature Oxidation Behavior of TiC/Al_3Ti Composite Coating Prepared by Laser Cladding

作　　者：王国华[1] 杨智成[1] 何欢[1] 符跃春[1] 

机构地区：[1]广西大学材料科学与工程学院有色金属及材料加工新技术教育部重点实验室,南宁530004

出　　处：《材料工程》2009年第S2期104-108,共5页Journal of Materials Engineering

基　　金：广西科学研究与技术开发应用基础专项项目(桂科基0731005)

摘　　要：采用激光熔覆技术在铝合金表面制备了TiC颗粒增强Al3Ti金属间化合物复合材料涂层,研究了涂层在600℃和900℃时的高温氧化性能。结果表明,涂层由树枝晶Al3Ti,枝晶间组织α-Al和均匀分布的TiC颗粒组成。循环氧化70h后,涂层在600℃时没有明显的氧化增重,氧化产物是一层薄的Al2O3。900℃时涂层的氧化增重明显,且随着涂层中TiC含量的增加抗氧化性能降低,氧化产物是一层连续而致密的富Al2O3和MgO的混合物。氧化层在氧化过程中没有出现开裂和脱落现象,表现出较强的抗循环氧化性能。TiC particle-reinforced Al3Ti intermetallic matrix composite coatings were prepared on the surface of aluminum alloys by laser cladding.The high-temperature oxidation behaviors of the coatings at 600℃ and 900℃ were studied.The results show that the coatings are made up of dendrites Al3Ti,interdendrites α-Al and uniform distribution of TiC.The coatings exhibit slight oxidation weight gain after cyclic oxidation at 600℃ for 70h,and the oxidation production is a thin layer of Al2O3.When oxidized at 900℃ for 70h,the oxidation weight gain of coatings becomes significant.The oxidation resistance of the coating decreases with the increasing of TiC content in it,and the oxidation production is a layer of dense and continuous rich-Al2O3 and MgO mixture.All oxidation layers are free of cracks and spalling,which proves the excellent cyclic oxidation resistance of the coatings.

关 键 词：激光熔覆 AL3TI TIC 高温氧化 

分 类 号：TG174.4[金属学及工艺—金属表面处理]