摘要
以Ni60-10%hBN(质量分数/%)复合粉末为原料,采用激光熔覆技术在TC4合金表面成功制备出了γ-Ni/TiC/TiB2+CrB-Ni3B/hBN高温自润滑耐磨复合涂层。在600℃下分别将该复合涂层保温10、30、50h,研究不同时长的高温时效处理后该复合涂层的物相、组织形貌、显微硬度和摩擦学性能的变化及其机理。结果表明,高温时效处理前后复合涂层的物相组成基本不变,高温时效处理50h后的涂层平均显微硬度由时效处理前的1162HV0.2降为910HV0.2;涂层的摩擦系数及磨损率由时效处理前的0.225和4.85×10-6 mm3/Nm分别升高到0.375和5.35×10-6 mm3/Nm,但相较于基体仍然具有良好的耐磨减摩性能,在600℃下长时间时效处理后,该复合涂层的物相、组织和摩擦学性能都表现出良好的高温稳定性。
The γ-Ni/TiC/TiB2 ＋CrB＋Ni3 B/hBN high-temperature self-lubrication anti-wear composite coatings were fabrica- ted on TC4 titanium alloy by laser cladding, using the Ni60-10%hBN preplaced composite powders. The phase composition, microstructure, microhardness, tribological property of the composite coatings were evaluated after heating at 600 ℃ for 10, 30, 50 h. The results show that the phase composition in the coatings changes a little. The microhardness of the composite coating dips to 910 HV0.2 form 1 162 HV0.2 after aging at 600 ℃ for 50 h. The friction coefficient and wear rate of the com- posite coating rise to 0. 375 and 5.35 × 10-6 mm3/Nm form 0. 225 and 4.85 × 10-6 mm3/Nm, but they still have good self-lubri- cation anti-wear performance compared with the TC4 alloy substrate. The phase composition, microstructure and tribological properties of the composite coatings present good high-temperature stability after 50 h aging treatment.
出处
《应用激光》
CSCD
北大核心
2015年第6期623-628,共6页
Applied Laser
基金
江苏省自然科学基金资助项目(项目编号:BK20141194
BK20131155)
江苏省高端结构材料重点实验室开放基金资助项目(项目编号:hsm1401)
关键词
激光熔覆
复合涂层
时效处理
组织与性能
高温稳定性
laser cladding
composite coating
aging treatment
microstucture and property
high-temperature stability
