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采用CO2激光器在H13钢基体上制备了Ni+h-BN自润滑复合涂层,利用光学显微镜(OM)、扫描电镜(SEM)、能谱分析仪(EDS)和X射线衍射仪(XRD)等手段分析涂层组织和相组成,利用显微硬度计和M200型摩擦磨损试验机测试了涂层的硬度和摩擦磨损性能。结果表明,Ni+5%h-BN(质量分数,下同)涂层主要是γ-Ni基体上分布着条状Cr2N相和少量不规则块状CrB相;Ni60+10%h-BN组织主要是短小的杆状CrB相;Ni60+15%h-BN涂层组织为类树枝晶CrB相。随着h-BN含量的增加,Ni+h-BN涂层的显微硬度增大,摩擦系数减小。其中最高显微硬度可达1200HV0.2,约为基底的4倍。Ni+h-BN涂层的摩擦系数和磨损失重量较Ni60涂层显著降低,最小的磨损失重量仅为基体的6%。
Ni + h-BN self-lubricating composite coating was prepared on H13 steel substrate by using CO2 laser. The microstructure of the coating was characterized by OM, SEM, EDS and XRD Means analysis of the coating composition and phase composition, the use of micro-hardness tester and M200-type friction and wear testing machine to test the coating hardness and friction and wear properties. The results show that the Ni + 5% h-BN (mass fraction, the same below) coating is mainly distributed in the γ-Ni matrix Cr2N phase and a small amount of irregular massive CrB phase; Ni60 + 10% h-BN is mainly Is a short rod-like CrB phase; Ni60 + 15% h-BN coating-like dendritic CrB phase. As the content of h-BN increases, the microhardness of Ni + h-BN coating increases, and the friction coefficient decreases. The highest microhardness up to 1200HV0.2, about 4 times the substrate. The friction coefficient and wear loss of Ni + h-BN coatings were significantly lower than that of Ni60 coatings, with the minimum wear loss being only 6% of the matrix.