TiN and WS₂ + hBN reinforced Ni-based alloy self-lubricating composite coatings were fabricated on TC4 alloy by laser cladding using TiN, NiCrBSi, WS₂, and hBN powder mixtures. Energy-dispersive spectroscopy (EDS), scanning electron microscopy (SEM), X-ray diffractometry (XRD), and optical microscopy (OM) were adopted to investigate the microstructure. The wear behaviors of the self-lubricating composite coatings were evaluated under large contact load in room temperature, dry-sliding wear-test conditions. Results indicated that the phases of the coatings mainly include γ-Ni, TiN, TiNi, TiW, WS₂, and TiS mixtures. The average microhardness of the composite coating is 2.3–2.7 times that of the TC4 matrix. Laser cladding TiN/WS₂ + hBN/NiCrBSi self-lubricating composite coatings revealed a higher wear resistance and lower friction coefficient than those of the TC4 alloy substrate. The friction coefficient (COF) of the coatings was oscillating around approximately 0.3458 due to the addition of self-lubricant WS₂ + hBN and hard reinforcement TiN. The wear behaviors testing showed that the wear resistance of the as-received TC4 was significantly improved by a laser cladding TiN/WS₂ + hBN/NiCrBSi self-lubricating composite coating.

中文翻译：

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激光熔覆TiN / WS2 + hBN / NiCrBSi自润滑复合涂层在TC4合金上的磨损行为

使用TiN，NiCrBSi，WS ₂和hBN粉末混合物通过激光熔覆在TC4合金上制备TiN和WS ₂ + hBN增强的Ni基合金自润滑复合涂层。采用能谱仪（EDS），扫描电子显微镜（SEM），X射线衍射仪（XRD）和光学显微镜（OM）来研究其微观结构。在室温，干滑磨损测试条件下，在大接触载荷下评估了自润滑复合涂层的磨损行为。结果表明，涂​​层的相主要包括γ-Ni，TiN，TiNi，TiW，WS ₂和TiS混合物。复合涂层的平均显微硬度是TC4基质的平均显微硬度的2.3-2.7倍。激光熔覆TiN / WS ₂+ hBN / NiCrBSi自润滑复合涂层比TC4合金基材具有更高的耐磨性和更低的摩擦系数。由于添加了自润滑性WS ₂ + hBN和硬质增强TiN ，涂层的摩擦系数（COF）大约在0.3458左右波动。磨损行为测试表明，采用激光熔覆TiN / WS ₂ + hBN / NiCrBSi自润滑复合涂层可以显着改善所接收的TC4的耐磨性。