激光原位合成Ni3Al金属间化合物覆层及其高温摩擦学性能

摘要

Ni3Al intermetallic compound coating was successfully in-situ synthesized by laser cladding on stainless steel surface.Crystalline phase composition and microstructure of the coating were characterized by X-ray diffraction and scanning electron microscopy.It is found that the coatings are composed of Ni3Al single-phase and exhibit good metallurgical bonding between Ni3Al coatings and stainless steel substrats.The tribological properties of the coatings at high temperature are evaluted using pin -on-disk tester.Results show that the coatings have the lowest friction coefficient 0.51 and wear rate 1.38 × 10-4 mm3/Nm at 500 ℃.%利用激光熔覆技术在不锈钢基材表面原位合成了Ni3Al金属间化合物覆层.用XRD和SEM分析了覆层的相组成和组织结构.在CSM栓-盘摩擦磨损试验机上对覆层的高温摩擦磨损性能进行了测试.结果表明:覆层由单相Ni3Al金属间化合物组成;覆层与基材呈良好的冶金结合;覆层的摩擦因数和磨损率在500℃时具有最低值,分别为0.51和1.38×10-4 mm3/Nm.