期刊论文

High Temperature Oxidation Resistance of NiMoSi Composite Coatings on Ti6Al4V Alloy by Laser Cladding

中文

中国表面工程

1007-9289

2018

31

6

109-117

10.11933/j.issn.1007-9289.20180803003

国家自然科学基金(U1737112) 湖南省自然科学基金(2018JJ2677) 河南科技大学高端轴承摩擦学技术与应用国家地方联合工程实验室开放基金(201803).

本校为第一机构

为提高Ti6Al4V合金的高温抗氧化性能,以Ni-48%Mo-32%Si混合粉末为原料,采用激光熔覆技术在Ti6Al4V合金表面制备复合涂层,分析涂层物相、组织结构、高温抗氧化性能及抗磨损性能,并讨论相关机理。结果表明:复合涂层中无裂纹,与基体实现了良好的冶金结合;硬质相Ti_5Si_3、MoSi_2和Mo_5Si_3均匀分布于基体α-Ti、NiTi中。经恒温800 ℃氧化100 h后,复合涂层的氧化膜主要由TiO_2、SiO_2和NiO组成,结构连续致密,表现出较好的高温抗氧化性能。而Ti6Al4V合金氧化膜主要为疏松TiO_2,表面氧化严重;氧化后,复合涂层和基体的单位面积增重分别为1.31和23.38 mg/cm~2;复合涂层和基体的摩擦因数分为0.44和0.52、...

In order to enhance the high-temperature oxidation resistance of Ti6Al4V alloy, Ni-48% Mo-32% Si precursor mixed powders were adopted to prepare the composite coatings by laser cladding. The phase composition, microstructure, high temperature oxidation resistance and wear resistance of the composite coatings were analyzed, and the corresponding mechanisms were discussed. Results show that the composite coatings with no cracks have metallurgical bonding with the substrates. The enhanced phases composed of primary Ti_5Si_3/MoSi_2/Mo_5Si_3 are wel...