论文部分内容阅读
以NiCr/Cr3C2-10%WS2、NiCr/Cr3C2-20%WS2、NiCr/Cr3C2-30%WS2合金粉末为原料,采用激光熔覆技术在Ti-6Al-4V合金表面制备了γ-NiCrAlTi/TiC+TiWC2/CrS+Ti2CS复合涂层。采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱仪(EDS)分析了涂层的物相和显微组织。结果表明:激光熔覆的复合涂层与基体呈冶金结合,γ-NiCrAlTi/TiC+TiWC2/CrS+Ti2CS复合涂层主要由硬质TiC和TiWC2为耐磨增强相、γ-NiCrAlTi为增韧相、Ti2CS和CrS金属硫化物为自润滑相的自润滑耐磨复合涂层。随着固体润滑剂WS2添加含量的增加,γ-NiCrAlTi/TiC+TiWC2/Ti2CS+CrS涂层中的金属硫化物体积分数明显增加,复合涂层的磨损率逐渐降低,复合涂层自润滑耐磨性能明显增强。
Γ-NiCrAlTi / TiC + alloy was prepared on the surface of Ti-6Al-4V alloy by NiCr / Cr3C2-10% WS2, NiCr / Cr3C2-20% WS2 and NiCr / Cr3C2-30% WS2 alloy powders by laser cladding. TiWC2 / CrS + Ti2CS composite coating. The phase and microstructure of the coating were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS). The results show that the laser cladding composite coating is metallurgically bonded to the substrate. The γ-NiCrAlTi / TiC + TiWC2 / CrS + Ti2CS composite coating mainly consists of hard TiC and TiWC2 as wear-resistant reinforcing phase and γ-NiCrAlTi as toughening phase , Ti2CS and CrS metal sulfides are self-lubricating, wear-resistant composite coatings that are self-lubricating. With the increase of the content of solid lubricant WS2, the volume fraction of metal sulfides in γ-NiCrAlTi / TiC + TiWC2 / Ti2CS + CrS coatings increased obviously, the wear rate of composite coatings decreased gradually, Significantly enhanced performance.