Ti6Al4V合金激光熔覆复合涂层的摩擦学和高温抗氧化性能研究
发布时间：2019-05-25 01:09
【摘要】：为了改善Ti6Al4V合金的摩擦学和高温抗氧化性能,预置Ni Cr/Cr3C2-Al-Si复合粉末,采用激光熔覆技术在钛合金表面制备复合涂层。表征了涂层的显微组织结构,测试了涂层的摩擦学和高温氧化性能,并分析了相关机理。结果表明:涂层由Ti C、Ti5Si3和Cr3Si增强相及γ-Ni/Al8Cr5基体组成,平均显微硬度为750 HV0.5,约为Ti6Al4V(360 HV0.5)合金的2倍。室温(25℃)下,由于涂层的高硬度可有效抵抗塑性变形,涂层表现出较好的耐磨性能;高温(600℃)下,钛合金表面生成氧化膜,呈现自润滑效果,而涂层表面产生裂纹,耐磨性能轻微降低。恒温(800℃)氧化32 h后,钛合金表面发生严重氧化腐蚀,而涂层表面生成致密的Al2O3、Ni O和Cr2O3混合氧化物,有效阻止了氧原子的扩散,高温抗氧化性能约为钛合金基体的8.4倍。
[Abstract]:In order to improve the tribological and high temperature oxidation resistance of Ti6Al4V alloy, Ni Cr/Cr3C2-Al-Si composite powder was preset and the composite coating was prepared on the surface of titanium alloy by laser coating. The microstructure of the coating was characterized, the tribological and high temperature oxidation properties of the coating were tested, and the related mechanism was analyzed. The results show that the coating is composed of Ti C, Ti5Si3 and Cr3Si reinforced phase and 纬-Ni/Al8Cr5 substrate, and the average microhardness of the coating is about 2 times of that of Ti6Al4V (360 HV0.5) alloy with an average microhardness of 750 HV0.5,. At room temperature (25 鈩，
本文编号：2485355
[Abstract]:In order to improve the tribological and high temperature oxidation resistance of Ti6Al4V alloy, Ni Cr/Cr3C2-Al-Si composite powder was preset and the composite coating was prepared on the surface of titanium alloy by laser coating. The microstructure of the coating was characterized, the tribological and high temperature oxidation properties of the coating were tested, and the related mechanism was analyzed. The results show that the coating is composed of Ti C, Ti5Si3 and Cr3Si reinforced phase and 纬-Ni/Al8Cr5 substrate, and the average microhardness of the coating is about 2 times of that of Ti6Al4V (360 HV0.5) alloy with an average microhardness of 750 HV0.5,. At room temperature (25 鈩，
本文编号：2485355
本文链接：https://www.wllwen.com/kejilunwen/jinshugongy/2485355.html
教材专著
