时效处理对激光熔覆Ni60-hBN自润滑耐磨复合涂层的影响

发布时间：2018-02-11 09:47

  本文关键词： 激光熔覆 复合涂层 时效处理 组织与性能 高温稳定性　出处：《应用激光》2015年06期 　论文类型：期刊论文

【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。
[Abstract]:Using Ni60-10hBN composite powder as raw material, 纬 -Ni / TiC / TiB2 CrB-Ni3B/hBN high temperature self-lubricating and wear resistant composite coatings were successfully prepared on the surface of TC4 alloy by laser cladding technique. The change of microhardness and tribological properties and its mechanism. The results show that the phase composition of the composite coating is basically unchanged before and after high temperature aging treatment. The average microhardness of the coating decreased from 1162HV0.2 to 910HV0.2, and the friction coefficient and wear rate of the coating increased from 0.225 and 4.85 脳 10-6 mm3/Nm to 0.375 and 5.35 脳 10-6 mm / Nm, respectively. Good friction and wear resistance, After aging at 600 鈩，

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