激光熔覆Zr—Al—Ni—Cu复合涂层组织及其摩擦磨损性能

采用激光熔覆技术在 Ti基体上制备了 Zr65Al7.5Ni1 0 Cu1 7.5合金涂层 ,涂层由金属间化合物、少量非晶和纳米晶构成 .分别向涂层中添加 C或 B及 Si等组元 ,使涂层硬度由原来的 10 41H K升高到 10 85 H K和 12 5 2 H K;同时在干摩擦条件下考察了其摩擦磨损行为 .结果表明 ,涂层的摩擦系数分别为 0 .14、0 .16和 0 .17,涂层磨损机制以磨粒磨损、剥层磨损和粘着磨损为主

Microstructure and Tribological Properities of Laser Clad Zr-Al-Ni-Cu Composite Coating

Zr 65Al 7.5Ni 10Cu 17.5 alloy coating was produced on Ti substrate by laser cladding. The effect of C and B/Si incorporation on the mechanical and tribological behavior of the coating was examined based on observation of the microstructure and worn surface morphologies with transmittance electron microscope and scanning electron microscope. The resulting coatings consist of amorphous phase, intermetallic phase, and nanocrystalline phase. The incorporation of C and B/Si contributed to increase the hardness of the coatings from 1041HK to 1085HK and 1252HK, respectively, while the friction coefficient increased slightly. The predomination wear mechanisms of the coatings were abrasive wear, delamination, and adhesion wear.