摘要
用化学复合镀技术在中碳钢基体上制备NiAl/纳米Al2O3镀层,并用横流CO2激光对涂层进行表面处理,采用X光能谱分析仪(EDS)、扫描电子显微镜(SEM)、X射线衍射仪(XRD)、显微硬度测试和球盘式摩擦磨损试验对涂层的成分、组织形貌和摩擦学性能等进行表征分析,并考察工艺参数对涂层结构和耐磨性能的影响。基于高功率、快扫描和大光斑的工艺原则,合成了Ni0.77AlFe0.23金属间化合物,涂层的硬度因相变硬化而明显提高,激光表面处理后涂层的摩擦系数和磨损失重明显减小。
NiAl/nano Al2O3 composite coatings are prepared on medium carbon steel substrate by electroless plating.The transverse-flow CO2 laser is employed to strengthen the coatings.The composition,microstructure and wear resistance of the coatings are characterized by energy dispersive X-ray spectroscopy（EDS）,scanning electron microscopy（SEM）,X-ray diffractometer（XRD）,microhardness tester,friction and wear test（ball-on-disk）.The effects of process parameters on microstructure and wear resistance of the coatings are investigated.Based on the high laser power,the fast traverse velocity and the large beam diameter,Ni0.77Al Fe0.23 intermetallics are synthesized in the coating.The microhardness of the coatings increases obviously due to the phase transformation hardening.The friction coefficient and wear loss obviously decrease after laser strengthening.
出处
《激光与光电子学进展》
CSCD
北大核心
2010年第10期91-96,共6页
Laser & Optoelectronics Progress
关键词
激光表面处理
化学复合镀
NIAL
显微组织
耐磨性
laser surface treatment
electroless composite plating
NiA1
microstructure
wear resistance
