激光熔敷Ti_5Si_3增强金属间化合物耐磨复合材料涂层组织及耐磨性研究  

Microstructure and Wear resistance of Laser Clad Ti_5Si_3 Reinforced Wear Resistant Intermetallic Composite Coating

作　　者：刘元富[1] 王华明[1,2] 

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 [2]华中科技大学激光技术国家重点实验室,湖北武汉430074

出　　处：《摩擦学学报》2003年第1期10-13,共4页Tribology

基　　金：国家高技术研究发展计划 (863计划 )资助项目 (2 0 0 2 AA3 3 10 3 0 );国家自然科学基金资助项目 (5 0 10 10 0 1);武器装备预研基金资助项目(5 14 180 5 0 2 0 1HK0 1);航空基础科学基金资助项目 (0 0 H5 10 13 );教育部重点实验室访问学者基金项目

摘　　要：以 Ni- 5 9Ti- 2 1Si合金粉末为原料 ,利用激光熔敷技术在 BT9钛合金表面制备了含 Ti5Si3金属间化合物的耐磨复合材料涂层 .利用光学金相显微镜、扫描电子显微镜、能量色散谱仪及 X射线衍射仪观察分析了复合材料涂层的显微组织结构 ;同时考察了复合材料涂层在室温滑动干摩擦条件下的耐磨性能 .结果表明 :复合材料涂层主要组织包括Ti5Si3增强相、金属间化合物 Ni Ti2 与少量β钛基固溶体及 Ti5Si3共晶 ;其组织结构均匀 ,与基体之间为完全冶金结合 ;复合材料涂层具有硬度高、抗粘着磨损能力强的特点 ,在滑动干摩擦试验条件下表现出优异的耐磨性及良好的承载能力 ;其磨损质量损失随载荷增大变化很小 .A wear resistant intermetallic matrix composite coating with Ti 5Si 3 as the reinforcing phase was fabricated on titanium alloy BT9 by laser cladding with Ni 59Ti 21Si alloy powders as the raw material. Microstructure of the coating was characterized by optical microscopy, scanning electron microscopy, X ray diffraction and energy dispersive spectroscopy. Wear resistance of the composite coating in dry sliding against SAE52100 steel was evaluated at ambient condition, using AISI1045 steel specimen as the reference. Results indicate that the laser clad intermetallic composite coating had a rapidly solidified homogeneous microstructure consisting of Ti 5Si 3 primary particles uniformly distributed in the NiTi 2 Ti 5Si 3 β eutectic matrix and was metallurgically bonded to the titanium substrate. The laser clad composite coating had high hardness and excellent wear resistance under dry sliding wear test conditions. This was attributed to the formation of the hard Ti 5Si 3 and NiTi 2 intermetallic phases and the refined microstructure of the coating.

关 键 词：激光熔敷 Ti5Si3增强金属间化合物耐磨复合材料 涂层 组织 耐磨性 钛合金 

分 类 号：TG156.99[金属学及工艺—热处理]