摘要
在不同工艺条件下,EN8轴件表面采用横流CO2激光器熔覆BNi74CrSiB/微-纳米WC金属陶瓷涂层。通过对熔覆层组织、显微硬度和摩擦磨损性能分析测试表明,在激光功率为2kW,扫描速度为15mm/s、光斑直径为3mm时,可获得较微米粒度WC熔覆层更细小致密的晶粒熔覆层,熔覆层平均显微硬度可达980HV,约为基体硬度的4倍,微-纳米WC的加入能够改善摩擦磨损性能。熔覆后EN8钢轴件的显微硬度和耐磨损性得到极大的提高。
BNi74CrSiB/Micro-nano WC ceramic-metal coating on En8 shaft was achieved by using a C（）2 cross flow laser under different process condition. Mierostructure, micro hardness and wear resistance of cladding layer were studied. It was indicated that the optimum parameters are laser power 2 kW, scanning speed 15 ram/s, laser beam diameter 3 mm. Com- pared with micron-WC particles, crystal grains are more fine and uniform in micro nano WC coating. The average micro hardness of cladding layer comes to 980 HV, 4 times of that of the substrate. The addition of micro-nano WC improved the wear resistant of cladding layer. Micro hardness and wear resistant of En8 shaft were greatly improved.
出处
《新技术新工艺》
2012年第12期66-68,共3页
New Technology & New Process
