激光原位合成NiAl金属间化合物覆层的性能  

The Properties of NiAl Intermetallic Compound Coating Synthesized by Laser Cladding

作　　者：杨连斌[1] 俞友军[2,3] 赵杰荣[2,3] 周健松[2] 雷自强[1] 陈建敏[2] 

机构地区：[1]西北师范大学化学化工学院,兰州730070 [2]中国科学院兰州化学物理研究所固体润滑国家重点实验室,兰州730000 [3]中国科学院北京研究生院,北京100049

出　　处：《中国表面工程》2010年第5期36-40,共5页China Surface Engineering

基　　金：国家自然科学基金(基金号20674063;20774074)资助项目;高校博士点专项基金(20050736001)资助项目

摘　　要：利用激光熔覆技术在不锈钢(1Cr18Ni9Ti)基材上原位合成了单相NiAl金属间化合物覆层,利用XRD和SEM分析了覆层的组成和微观组织,用栓–盘摩擦磨损试验机对覆层摩擦学性能进行了研究。结果表明:激光工艺对NiAl覆层的显微组织结构有重要影响,在较低的功率密度条件下制备的NiAl覆层内部无裂纹和孔洞,与基底呈良好的冶金结合;覆层显微组织结构致密,显微硬度达到500HV并呈现出良好的摩擦磨损性能。Single NiAl phase intermetallic compound coatings were successfully in-situ synthesized by laser cladding with preplaced Ni and Al mixed powders.The phase composition and microstructure of the NiAl coatings were studied by X-ray diffraction and scanning electron microscopy.Tribological properties were examined using pin-on-disk tester under dry sliding conditions.The effects of laser cladding parameters on the microstructure of the NiAl coatings were investigated.Results show that the laser power density ha...

关 键 词：NIAL 金属间化合物 激光熔覆 摩擦学性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]