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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。
Using Ni60-10% hBN (mass fraction /%) composite powder as raw material, the high-temperature self-lubricating wear-resistant composite coating of γ-Ni / TiC / TiB2 + CrB-Ni3B / hBN was prepared on the surface of TC4 alloy by laser cladding Floor. The composite coatings were respectively incubated at 600 ℃ for 10, 30 and 50h. The phase and morphology, microhardness and tribological properties of the composite coatings were investigated after aging at different temperatures. The results show that the phase composition of the composite coating before and after high temperature aging is basically the same, the average microhardness of the coating after high temperature aging treatment is reduced from 1162HV0.2 before aging treatment to 910HV0.2 after 50h aging treatment; the friction coefficient of the coating and The wear rate increased from 0.225 and 4.85 × 10-6 mm3 / Nm before aging treatment to 0.375 and 5.35 × 10-6 mm3 / Nm, respectively, but still had good wear-resistant and friction-reducing properties compared with the matrix. Under the aging treatment for a long time, the composite coating shows good high temperature stability in its phase, microstructure and tribological properties.