Ti_2AlNbO相合金双层辉光等离子渗Mo摩擦性能  

Tribological Behaviors of Ti_2AlNb Orthorhombic Alloy Molybdenized by Double Glow Plasma Surface

作　　者：梁文萍[1] 徐重[1] 缪强[1] 刘小萍[1] 贺志勇[1] 

机构地区：[1]太原理工大学

出　　处：《稀有金属材料与工程》2006年第11期1826-1829,共4页Rare Metal Materials and Engineering

基　　金：国防科工委民口配套项目(MKPT-05-067)

摘　　要：利用双层辉光等离子表面冶金技术对Ti2AlNbO相合金进行渗Mo工艺研究。采用扫描电子显微镜、辉光放电光谱分析仪、X射线衍射仪和显微硬度计测试了渗Mo层的微观组织、化学成分、相组成和显微硬度。采用可控气氛微型摩擦磨损实验仪进行耐磨性研究。在最佳工艺参数下,渗Mo层可达100μm,表面Mo含量超过90%,且从表面到心部呈梯度分布。渗Mo层主要由纯Mo及Al5Mo相组成,硬度HV达8000MPa,渗Mo试样的平均摩擦因数为0.085,较Ti2AlNb基材降低6倍,磨损率仅为基材的7.5%。结果表明:Ti2AlNbO相合金表面的耐磨性能得到极大地提高。A double glow plasma surface molybdenizing was carried out on the surface of Ti2AlNb to improve its wear resistance. The microstructure and morphology of the molybdenized layer were investigated by scanning electronic microscopy （SEM） and X-ray diffraction （XRD）, and the composition distribution was analyzed by glow discharge spectrum （GDS）. The micro-hardness from the surface to center was also been measured. A rubbing of ball vs. disc was conducted on a miniature friction test machine to investigate tribological behavior. Under an optimized process condition, the thickness of the molybdenized layer reached 100 μm. The surface content of Mo was about 90% and decreased in gradient along the distance from the surface to the center. Mo existed in the forms of both pure Mo and Al5Mo. The surface hardness HV was above 8000 MPa. The average friction coefficient is about 0.085, only one seventh of TiEAlNb matrix friction coefficient. The wear rate of the molybdenized specimen was just 7.5% of that of matrix. The results indicate that the wear resistance of TiEAlNb alloy has been improved effectively.

关 键 词：Ti2AlNbO相合金 双层辉光等离子表面渗Mo 硬度 摩擦因数 耐磨性 

分 类 号：TG156.8[金属学及工艺—热处理]