反应等离子喷涂TiN复相涂层的组织与性能研究

采用工业纯钛粉,利用反应等离子喷涂技术,在45钢表面原位合成TiN复相涂层。利用X射线衍射仪分析了涂层的物相组成,采用扫描电镜观察涂层的组织结构、显微压痕、断口和磨损形貌,采用能谱仪分析压痕微区成分,测试了涂层的显微硬度和耐磨性能。结果表明:复相涂层由TiN、TiN0.3、Ti3O组成;涂层具有典型的层状组织结构,且层与层之间、层与基体之间结合较好;涂层的显微硬度为983~1 254 HV0.1;显微压痕形状清晰、规则,且压痕周围无翘边现象;断口形貌说明涂层具有一定的韧性,为介于陶瓷材料与韧性材料之间的混合断裂机制;涂层在低载荷时耐磨性能最佳。

Research on microstructure and properties of reactive plasma spraying TiN composite coatings

TiN composite coatings were successfully fabricated on 45 steel surface using commercial pure titanium powders by means of reactive plasma spraying technology. The phase composition of the coating was analyzed with XRD. The microstructure,indentation,fracture and worn morphologies of TiN coating were observed through SEM. The indentation composition was analyzed by EDS. The micro-hardness and the wear resistance were also determined as well. Results indicate that the coating is mainly consisted of TiN,TiN0.3 and Ti3O. The coating has typical layer structure,and the layers between coatings or substrates are in good adhesive condition. The micro-hardness of the coating is 983-1 254 HV0.1. The indentation is clear and there is no crack around. The fracture morphology shows that the coating has better toughness and the fracture mechanism is a mixture of ceram-ic and ductile materials. The coating has the best wear resistance when the load is low.