ABSTRACT The proposed work deals with the tribological studies of thermal spray coated nano ceramic composite materials (GO/WC-10Co-4Cr) under the presence of jojoba oil based bio lubricant. Flame spray coating was carried out on AA6061 discs with coating thickness of (50–150 µm) by different concentrations of (GO) graphene oxide (0.075–1%)wt. + nano mixture of WC-10Co-4Cr powder. Tribology tests were conducted on the coated disc samples using pin on disc apparatus as per ASTM G99-05 for various test parameters namely applied load (50N–150N), disc rotational speed (1–10 m s−1), % vol. concentration of Jojoba oil (0–30%). Results obtained from the tribo tests clarifies that the 0.085 GO/WC-10Co-4Cr composite coatings with 150µm exhibited lower friction coefficient of 0.1854, lesser wear rate of 2.25×10−5 mm3 Nm−1 compared with that of the uncoated specimens. SEM analysis portrays the formation of IMC'S (aluminium carbonate Al2(CO3)3 and chromate Al2(CrO4)3)to strengthen the boundary regime against oxidative wear.

中文翻译：

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生物润滑条件下n-(GO/WC-10Co-4Cr)HVOF涂层的摩擦学特性

摘要 拟议的工作涉及在荷荷巴油基生物润滑剂存在下热喷涂纳米陶瓷复合材料 (GO/WC-10Co-4Cr) 的摩擦学研究。通过不同浓度的（GO）氧化石墨烯（0.075-1％）wt在AA6061圆盘上进行火焰喷涂，涂层厚度为（50-150μm）。+ WC-10Co-4Cr 粉​​末的纳米混合物。根据 ASTM G99-05，使用针对盘装置对涂层圆盘样品进行摩擦学测试，用于各种测试参数，即施加的载荷 (50N–150N)、圆盘转速 (1–10 m s-1)、% vol。荷荷巴油的浓度 (0–30%)。摩擦试验结果表明，150μm 0.085 GO/WC-10Co-4Cr 复合涂层的摩擦系数较低，为 0.1854，磨损率为 2。25×10−5 mm3 Nm−1 与未涂层试样相比。SEM 分析描绘了 IMC'S（碳酸铝 Al2(CO3)3 和铬酸盐 Al2(CrO4)3）的形成，以加强边界状态以防止氧化磨损。