Ni-based alloys are resistant against wear and corrosion, and are widely applied in surface engineering. In this study, different amounts of graphite (0, 5 and 10 wt.%) are added to NiCrBSi powder as a solid lubricant. The pure and composite powders are deposited on 420 stainless steel through the high-velocity oxygen fuel process. The microstructure and properties of the coatings are examined through x-ray diffraction and scanning electron microscope. Vickers microhardness test is run for the coatings’ hardness measurement. NiCrBSi has the highest hardness of 650HV. Hardness of the coatings decreases with the increase in the graphite content. The porosity measurement by ImageJ analyzer indicates that the NiCrBSi coating has the lowest porosity. To assess the ambient and high-temperature wear resistance of the coatings, ball-on-disk wear tests were run with 15 N load and the sliding distance of 1000 m at 25 °C and 450 °C. The results indicate that the NiCrBSi and NiCrBSi-10 wt.%Gr coatings have the highest wear resistance at ambient and high temperatures, respectively. The friction coefficient of the coatings containing lubricant is lower than that of the NiCrBSi coating.

中文翻译：

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HVOF 沉积在不锈钢 420 上的 NiCrBSi-Gr 复合涂层的摩擦学性能表征和评价

镍基合金耐磨、耐腐蚀，广泛应用于表面工程。在本研究中，将不同量的石墨（0、5 和 10 重量%）添加到 NiCrBSi 粉末中作为固体润滑剂。纯粉末和复合粉末通过高速氧气燃料工艺沉积在 420 不锈钢上。通过X射线衍射和扫描电子显微镜检查涂层的微观结构和性能。维氏显微硬度测试用于涂层的硬度测量。NiCrBSi的最高硬度为650HV。涂层的硬度随着石墨含量的增加而降低。ImageJ 分析仪的孔隙率测量表明 NiCrBSi 涂层的孔隙率最低。为了评估涂层的环境和高温耐磨性，在 25 °C 和 450 °C 条件下，以 15 N 载荷和 1000 m 的滑动距离运行球盘磨损测试。结果表明，NiCrBSi 和 NiCrBSi-10 wt.%Gr 涂层分别在环境温度和高温下具有最高的耐磨性。含润滑剂涂层的摩擦系数低于NiCrBSi涂层。