摘要
采用W150SAYAG激光焊接机在45#钢基材表面熔覆含CeO2的镍基TiC陶瓷涂层,研究添加不同含量CeO2对涂层的微观组织和摩擦学性能的影响。研究结果表明:添加适量CeO2对涂层的微观组织、显微硬度、涂层与基材结合区,以及涂层的摩擦学性具有改善作用;CeO2能减弱熔池中TiC陶瓷相的生长方向性,避免相邻的TiC颗粒桥接生长,细化和球化TiC颗粒,并使之且分布均匀;CeO2能促使TiC硬质相弥散分布,涂层组织趋向均匀化,并减少杂质和气体的不良影响,提高涂层的组织性能;CeO2能促进涂层与基材之间形成合理的成分梯度,得到良好的结合区;CeO2能促进摩擦过程中涂层表面氧化膜的形成并提高氧化膜的热稳定性,减少涂层的大片层状剥落,降低涂层的黏着磨损和磨粒磨损。
The TiC/Ni-based coatings added CeO2 on the surface of 45° steel substrate were claded by W150SA YAG laser. Effect of CeO2 on microstructure and tribological properties of coatings was investigated. The results show that adding proper content of CeO2 benefits for the microstructure, micro-hardness, bonding zone between coatings and substrate, and tribological properties of coatings. CeO2 can disperse the growing direction of TiC particles, avoid the bridging growth of the particles in cluster, refine and spheroidize the particles, improve the distribution uniformity. CeO2 can refine the coating grains,reduce the crackles, porous and entrapment, make the coating microstructure more compact and denser. CeO2 benefits to form reasonable composition gradient between coatings and substrate, promotes to get a firm bonding zone between them. CeO2 can improve the thermal stability of surface oxide film, decrease the flake off and scuffing of coatings, reduce adhesive wear and abrasive wear.
出处
《润滑与密封》
CAS
CSCD
北大核心
2009年第9期40-43,共4页
Lubrication Engineering
基金
国家自然科学基金项目(50675125)
关键词
CEO2
微观组织
摩擦学性能
陶瓷涂层
CeO2
microstructure
tribological properties
ceramic coatings
