【摘要】 采用火焰喷焊技术在T i 6A l 4V合金基体上制备了镍基耐磨涂层,研究了其显微组织、合金元素的扩散、显微硬度和干摩擦磨损性能。结果表明,喷焊涂层具有韧基体加硬质相的耐磨组织;涂层横切面的组织、显微硬度和合金元素的扩散沿层深方向呈现连续性和渐变性,基体和涂层表现为冶金结合;喷焊表层的显微硬度为933.2 HV,是基体钛合金的3倍以上;涂层在不同条件下的磨损量都较小,耐磨性有较大的提高,转速和温度对其耐磨性能影响较大。更多还原

【Abstract】 The Ni-based wear resistance coating on Titanium alloys substrate made by flames spray-welding technique has been prepared,and the microstructure,the element distribution and the micro-hardness of the coating and its tribological properties under dry sliding against steel were determined.The results show that the microstructure of spray-welding layer is characterized by a wear resistant microstructure composed by tough substrate and hard particles,the microstructure, the micro-hardness and the element distribution in the cross section change continuously and gradually along depth direction,and a metallurgical bonding has been formed between coating and substrate,the micro-hardness of its surface is 933.2 HV,which is 3 times higher than that of titanium alloy substrate,the wear loss of the coating is little in all experimental conditions,so the wear resistance has been improved considerably,moreover,it is found that speed and temperature have obvious influence to its wear resistance.更多还原