激光熔敷Ti_5Si_3/(NiTi_2+β+Ti_5Si_3)复合涂层组织与耐磨性  

Microstructure and wear resistance of laser clad Ti_5Si_3/(NiTi_2+β+Ti_5Si_3) composite coating

作　　者：刘元富[1] 赵海云[1] 王华明[1] 柳国萍[2] 

机构地区：[1]北京航空航天大学材料学院激光材料加工与表面工程实验室,北京100083 [2]胜利石油学校机械专业,山东东营257000

出　　处：《材料科学与工艺》2002年第4期337-340,共4页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50071004);航空基础科学基金资助项目(00H51013);教育部高等学校重点访问学者基金资助项目.

摘　　要：为了提高钛合金的干滑动磨损耐磨性能,以Ti-Si-Ni混合合金粉末为原料对BT9钛合金进行激光熔敷处理,制备出以金属间化合物Ti5Si3为耐磨增强相的快速凝固'原位'耐磨复合涂层,利用金相、SEM、XRD等技术分析了涂层的成分及显微组织结构,在室温干滑动磨损试验条件下测试了涂层的耐磨性.结果表明:涂层中Ti5Si3初生相均匀分布于NiTi2-β-Ti5Si3共晶基体上,整个涂层组织均匀、致密、无气孔、无裂纹;涂层与钛合金基材形成了良好的冶金结合,涂层具有很高的硬度,在室温干滑动磨损试验条件下具有优异的耐磨性能.To improve the dry sliding wear resistance of titanium alloy, a wear resistant Ti5Si3 reinforced intermetallic composite coating was fabricated on substrate of titanium alloy BT9 by laser cladding using the Ni-Ti-Si alloy powders. The composition and the microstructure of the intermetallic composite coating was investigated by OM, SEM, XRD and EDS. The wear resistance of the coating was tested under dry sliding wear condition at room temperature. The results indicated that the laser clad composite coating was free from porous and microcracks and has a rapidly solidified homogeneous microstructure consisting of Ti5Si3 primary particles uniformly distributed in the NiTi2-β-Ti5Si3 eutectic matrix. The laser clad Ti5Si3/(NiTi2+β+Ti5Si3) composite coating has high hardness and excellent wear resistance under dry sliding wear test conditions.

关 键 词：NiTi2 TI5SI3 复合涂层 激光熔敷 显微组织 耐磨性 钛合金 硅化钛 表面处理 

分 类 号：TG174.44[金属学及工艺—金属表面处理]