TiC颗粒增强镍基合金复合涂层的摩擦学性能(英文)  

Tribological properties of TiC particles reinforced Ni-based alloy composite coatings

作　　者：蔡滨[1] 谭业发[1] 何龙[1] 谭华[1] 高立[1] 

机构地区：[1]解放军理工大学野战工程学院,南京210007

出　　处：《中国有色金属学会会刊：英文版》2013年第6期1681-1688,共8页Transactions of Nonferrous Metals Society of China

摘　　要：运用等离子喷涂技术制备了TiC颗粒增强镍基合金复合涂层,分析了TiC颗粒增强镍基合金复合涂层的微观结构,研究了其摩擦磨损行为与机理。结果表明:TiC颗粒增强镍基合金复合涂层主要由γ-Ni,CrB,Cr7C3和TiC构成;复合涂层与基底材料间形成了厚度为9.4μm的过渡层,达到了冶金结合。当TiC颗粒含量为30%(体积分数)时,复合涂层的摩擦系数和磨损率均最低,即其摩擦系数为0.33,较纯镍基合金涂层降低了30%;其磨损率为0.3×10-3mm3/m,是纯镍基合金涂层的1/3。当载荷在6～10N的范围内时,复合涂层呈轻微磨损,其磨损机理主要为粘着磨损;当载荷达到12N时,复合涂层产生严重磨损,其磨损机制转变为硬质相的脱落和转移层的层脱剥落。The TiC particles reinforced Ni-based alloy composite coatings were prepared by plasma spray. The microstructure and tribological properties of the composite coatings were investigated. The results show that the composite coatings are mainly composed of γ-Ni, CrB, Cr7C3 and TiC. A transition layer of 9.4 μm in thickness forms at the interface, indicating the metallurgy bond between the composite coating and the substrate. When the content of TiC particles is 30% in volume fraction, both of the friction coefficient and wear rate of the composite coatings reach the lowest values. The friction coefficient is 0.33 which is reduced by 30%compared with the pure Ni-based alloy coating;the wear rate is 0.3×10?3 mm3/m which is about 1/3 that of latter. Under the load of 6?10 N, the composite coatings are in a slight wear stage and their wear mechanisms are mainly adhesive wear. Under the high load of 12 N, the composite coatings suffer from severe wear, and the wear mechanisms change into the desquamation of the hard phases and the delamination of the transferred layer.

关 键 词：等离子喷涂 复合涂层 TIC颗粒 镍基合金 摩擦与磨损 

分 类 号：TG174.44[金属学及工艺—金属表面处理]