激光熔敷NiTi/Ni_3Ti金属间化合物复合材料涂层组织及耐磨性  

Microstructure and wear resistance of laser clad NiTi/Ni_3Ti intermetallic composite coating

作　　者：李昂[1] 王华明[1] 

机构地区：[1]北京航空航天大学材料学院激光材料加工制造技术实验室,北京100083

出　　处：《材料热处理学报》2006年第5期87-90,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金项目(54071006);航空基础科学基金项目(05H51009)

摘　　要：以Ni79Ti21(wt%)合金粉末为原料,采用同步送粉激光熔敷技术在BT20钛合金表面制备出NiTi/Ni3Ti金属间化合物复合材料涂层,分析了该涂层的显微组织,测试了该涂层的室温干滑动磨损性能。结果表明,激光熔敷涂层组织均匀致密,与基材呈良好的冶金结合,具有优良的抗滑动磨损性能。Wear-resistant NiTi/Ni_3Ti intermetallic composite coating was fabricated on substrate of a titanium alloy BT20 by laser cladding.Microstructure of the NiTi/Ni_3Ti intermetallic composite coating was characterized and the room-temperature dry sliding wear-resistance was evaluated coupling with hardened bearing steel GCr15.The coating has a homogeneous microstructure and is metallurgically bonded to the titanium alloy substrate.Wear-resistance of the composite coating is superior to BT20 titanium alloy under dry sliding wear test conditions.The excellent wear resistance of the laser clad NiTi/Ni_3Ti intermetallic composite coating is attributed to the combination of high strength and toughness of intermetallics of NiTi and Ni_3Ti.

关 键 词：激光熔敷 金属间化合物 复合材料涂层 显微组织 磨损 

分 类 号：TG146[一般工业技术—材料科学与工程] TG156.99[金属学及工艺—金属材料]