【作者】 周龙早； 刘顺洪； 黄安国； 李志远；

【Author】 ZHOU Long-zao, LIU Shurr hong, HUANG An-guo,LI Zhi-yuan (Department of Materials Science & Engineering,HUST,Wuhan 430074,China)

【机构】 华中科技大学材料科学与工程学院；

【摘要】 将Ni-Cr合金粉末用有机粘接剂调成膏状涂在铸造铝合金ZL108基体上,然后采用CO2激光进行激光表面合金化处理。通过选择合理的工艺参数,在基体表面获得冶金结合性能良好的合金化层。利用光学显微镜、扫描电镜、能谱仪、X射线衍射仪对合金化层的显微组织结构进行详细的研究。结果表明,合金化层由Ni-Al金属间化合物组成,并且呈点状、弥散分布在Al-Si共晶基体上。合金化层的显微硬度可达到230HV左右,比基体材料提高大约3倍;耐磨性比基体提高2倍左右。更多还原

【Abstract】 Ni-Cr powder was mixed into paste with a organic binding agent and then painted onto the surface of cast aluminium alloy ZL108 for laser surface alloying using CO2 laser. Will optimum precess parameters, the alloyed lnyer withh guod metallurgical bonding performance is formed The microstructure characteristics of alloyed layer are investigated by using OM,SEM, EDAX and XRD. The results show that the alloyed layer is composed of inter metallic compounds of Nr Al ,which is some particles dispersed on the substrate of Al-Si mutual crystal. The micro hardness of alloyed layer can reach up to 230HV,which was three times higher than that of the substrate materials. The relative wear resistance is about two times higher than that of the substrate materials.更多还原