核阀钴基合金密封面高温氮离子注入层的摩擦磨损特性研究  

Study on Friction and Wear Characteristics of High Temperature Nitrogen Ion Implantation Layer on Nuclear Valve Cobalt-based Alloy sealing surface

作　　者：胡西云[1] 李必文[1,2] 何彬[1] 曹强[1] 

机构地区：[1]南华大学机械工程学院,湖南衡阳421001 [2]南华大学核科学技术学院,湖南衡阳421001

出　　处：《机械工程师》2015年第3期151-154,共4页Mechanical Engineer

基　　金：湖南省科技计划项目(2011FJ6060);湖南省重点学科建设资助项目(湘教发[2011]76号);湖南省高校科技创新团队支持项目(湘教通[2012]318号)

摘　　要：对经激光堆焊Stellite 6的316L核阀试样表面进行高温、高束流密度、大剂量的N+注入。分析了注入层的N+浓度分布及微观组织结构,测试了受注面的表面粗糙度及横截面的显微硬度,进行了摩擦磨损性能研究。结果表明,在上述条件下,N+的注入深度较常温条件提高了两个数量级且浓度呈准高斯状分布,近表面区形成了大量细小和微晶态的铁氮化合物,高能N+的轰击和溅射作用显著降低了受注堆焊层表面的粗糙度,受注表面及近表面区的显微硬度整体提高,N+注入对激光堆焊层的表面耐磨性能改善效果明显。探讨了N+注入对激光堆焊层表面强化的机理。The N^＋implantation at high temperature,high current density,high-dose was carried out on the surface of the316 L nuclear valve samples which have suffered laser cladding Stellite 6 alloy powder. The N^＋concentration distribution and microstructure of implanted layer were analysed,the surface roughness of implanted surface and microhardness of cross section were tested,the friction and wear properties was studied. The results indicate that： under the conditions described above,N^＋implantation depth has improved two orders of magnitude than the normal temperature conditions,the concentration distribution presented quasi-Gaussian,and a large number of small and micro crystalline iron-nitrogen compounds formed near surface region; The bombardment and sputtering effect of high-energy N^＋significantly reduce the surface roughness of the implanted cladding layer. The microhardness of implanted surface and near surface region has improved integrally; The improving effect of surface wear resistance of laser cladding layer by N^＋implanting is obvious.The surface enhanced mechanism of laser cladding layer by N^＋implanting has been discussed.

关 键 词：核阀密封面 Stellite合金 激光堆焊 高温N^+注入 摩擦磨损性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]