Cr_(13)Ni_5Si_2/γ-Ni三元金属硅化物高温耐磨复合材料  

High-temperature sliding wear resistant Cr_(13)Ni_5Si_2/γ-Ni ternary metal silicide composite

作　　者：方艳丽[1] 李安[1] 张凌云[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：《复合材料学报》2006年第6期80-85,共6页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(50331010;50471006);教育部跨世纪优秀人才计划基金;航空基础科学基金(05H51009)

摘　　要：采用激光熔化/连续沉积工艺制备出以Cr13Ni5Si2三元金属硅化物为初生相、以γ-Ni基固溶体为连续增韧相(基体)的三元金属硅化物耐磨复合材料(Cr13Ni5Si2/γ)。在高温滑动磨损条件下测试了Cr13Ni5Si2/γ复合材料的耐磨性能随温度的变化规律,并讨论了其磨损机理。结果表明,由于Cr13Ni5Si2三元金属硅化物具有原子结合力强和硬度-温度关系反常等特点,且Cr13Ni5Si2/γ复合材料具有优良的强韧性配合,以及Cr13Ni5Si2/γ复合材料在高温磨损过程中磨损表面能够形成转移覆盖层,Cr13Ni5Si2/γ材料在高温滑动磨损条件下具有非常优异的耐磨性能,较低的磨损温度敏感性和反常的磨损-温度关系。韧性基体γ-Ni的加入使Cr13Ni5Si2三元金属硅化物在600℃高温下滑动耐磨性能提高了3倍。A wear resistant metal silicide composite consisting of Cr13Ni5Si2 ternary metal silicide dendrites and the nickel-base solid solution （γ） matrix （Cr13Ni5Si2/γ） was designed and fabricated by the laser melting/continuous deposition process. High- temperature sliding wear resistance as a function of wear test temperature and high-temperature sliding wear mechanisms of the Cr13Ni5Si2/γ composite were studied. The results indicate that the Cr13Ni5Si2/γ composite has excellent wear resistance, low temperature-sensitivity of wear and anomalous wear-temperature dependence under high-temperature sliding wear test conditions due to the strong atomic binding forces and anomalous hardness- temperature dependence of Cr13Ni5Si2, good toughness and strength of the Cr13Ni5Si2/γ composite and the transferred cover- layer on the worn surface of the Cr13Ni5Si2/γ composite during the high- temperature sliding wear process. The wear resistance of the Cr13Ni5Si2 ternary metal silicide at 600 ℃ was improved to 4 times by adding a ductile γ-Ni matrix.

关 键 词：三元金属硅化物 耐磨复合材料 高温磨损 

分 类 号：TB331[一般工业技术—材料科学与工程] TG113[金属学及工艺—物理冶金]