γ-TiAl合金表面Cr-W共渗合金层的摩擦磨损性能研究  

FRICTION AND WEAR PROPERTIES OF SURFACE PLASMA Cr-W ALLOYING LAYER OF 7-TiAl ALLOY

作　　者：魏祥飞[1] 张平则[1] 魏东博[1] 陈小虎[1] 王琼[1] 王若男[1] 

机构地区：[1]南京航空航天大学材料科学与技术学院,南京211106

出　　处：《金属学报》2013年第11期1406-1410,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金资助项目51175247~~

摘　　要：采用双层辉光等离子表面渗金属技术在γ-TiAl合金表面制备Cr-W合金层.硬度实验表明,γ-TiAl合金Cr-W共渗后,合金层的表面显微硬度大幅提高,其中扩散层的显微硬度为648.8 HV_(0.1),比基体提高了2倍多.划痕实验表明,Cr-W共渗合金层至少能够承受70 N的垂直载荷,渗层与基体结合良好.室温条件下的摩擦磨损实验表明,Cr-W合金层摩擦系数平均为0.43,低于基体的0.70,磨痕较窄,且深度小,磨损失重和比磨损率相对于基体下降幅度较大;500℃摩擦磨损实验表明,Cr-W合金层摩擦系数为0.50,低于基体的0.75,且磨损量和比磨损率相对于基体都有所下降.Cr-W alloying layer was prepared on the TiAl alloy by using the double glow plasma surface alloying technology （DGP）. The hardness tests show that the surface micro-hardness of Cr-W alloying layer is greatly increased and the micro-hardness of diffusion layer is 648.8 HV0.1, increased two times more than the matrix. The scratch tests show that the bond between TiAl alloy and Cr-W alloying layer is very good and the layer at least can withstand 70 N vertical load. The friction and wear at room temperature tests show that the friction coefficient of Cr-W alloying layer is about 0.43, that of the matrix is 0.70. The wear scar is narrow, and the depth is small. The wear weight loss and wear rate relative to the matrix decrease greatly. The friction and wear at 500℃ tests show that the friction coefficient of Cr-W alloying layer is about 0.50, that of the body is 0.75. The wear weight loss and wear rate of Cr-W alloying layer are all less than the matrix.

关 键 词：Γ-TIAL合金 双层辉光等离子渗金属技术 Cr-W合金层 摩擦磨损性能 

分 类 号：TG174.4[金属学及工艺—金属表面处理]