γ-TiAl合金Ni-Cr-C-CaF_2复合材料激光熔覆  

Ni-Cr-C-CaF_2 Composite Laser Cladding on γ-TiAl Intermetallic Alloy

作　　者：刘秀波[1] 石世宏[1] 傅戈雁[1] 刘元富[2] 穆俊世[2] 

机构地区：[1]苏州大学机电工程学院,江苏苏州215021 [2]北京交通大学机电工程学院,北京100044

出　　处：《中国激光》2009年第6期1591-1594,共4页Chinese Journal of Lasers

摘　　要：以Ni-Cr-C-CaF_2复合合金粉末为原料,采用激光熔覆技术,在γ-TiAl合金基体表面制备出高温自润滑耐磨复合材料涂层,采用X射线衍射(XRD)、扫描电子显微镜(SEM)和能谱仪(EDS)等手段对所制备复合材料涂层的显微组织进行了分析。结果表明,该复合材料涂层由初生的短棒状或树枝状TiC和次生的块状Al_4C_3碳化物增强相以及细小、弥散、球状分布的CaF_2固体润滑颗粒均匀分布在塑韧性良好的NiCrAlTi(γ)固溶体基体中,其平均显微硬度约为HV 650,是基体TiAl合金的2倍。Experiments of laser cladding Ni-Cr-C-CaF2 precursor mixed powders to form a high-temperature self lubrication wear resistant composite coating on γ-TiAl substrate was carried out. The microstructure of the coating was examined using X-ray diffraction （XRD）,scanning electron microscope （SEM） and energy disperse spectroscopy （EDS）. The coating has a unique microstructure consisting of primary dendrite or short-stick TiC and secondary block Al4C3 carbides reinforcement as well as fine isolated spherical CaF2 solid lubrication particles uniformly dispersed in the ductile and tough NiCrAlTi （γ） matrix. The average microhardness of the composite coating is approximately HV 650 and it is 2-factor greater than that of the TiAI substrate.

关 键 词：激光技术 激光熔覆 显微组织 高温耐磨复合材料涂层 固体润滑 Γ-TIAL合金 

分 类 号：TN249[电子电信—物理电子学] TG174.44[金属学及工艺—金属表面处理]