Abstract The present study focuses on the influence of solid lubricants (MoS2, h-BN, Cr2AlC, and Cr2AlCAg) addition on the tribological properties of NiMoAl alloy in the range of 30 °C (Room Temperature, RT) to 400 °C. For this, NiMoAl and NiMoAl with 20 wt% of different solid lubricant powders were prepared and coated on a stainless steel substrate by High-Velocity Oxy-Fuel (HVOF) spraying. The coefficient of friction (COF) of NiMoAl coating at RT and 400 °C is 0.72 ± 0.05 and 0.47 ± 0.03, respectively. The addition of 20 wt% MoS2, h-BN, Cr2AlC, and Cr2AlCAg in NiMoAl reduces the COF by (50% & 30%), (47% & 45%), (37% & 49%) and (64% & 66%), respectively at RT & 400 °C. Characterization of the worn-out surfaces shows that the tribo-chemical by-products such as Ni3S2, Cr7C3, and Ag2MoO4 act as a friction modifier and reduces the COF. NiMoAl-20 wt% Cr2AlC coating shows a large decrease in COF with an increase in temperature.

中文翻译：

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添加固体润滑剂对 HVOF 喷涂 NiMoAl 涂层在 30 °C 至 400 °C 摩擦学性能的影响

摘要 本研究的重点是固体润滑剂（MoS2、h-BN、Cr2AlC 和 Cr2AlCAg）的添加对 NiMoAl 合金在 30 °C（室温，RT）至 400 °C 范围内的摩擦学性能的影响。为此，制备了含有 20 wt% 不同固体润滑剂粉末的 NiMoAl 和 NiMoAl，并通过高速氧燃料 (HVOF) 喷涂将其涂覆在不锈钢基材上。NiMoAl 涂层在 RT 和 400°C 下的摩擦系数 (COF) 分别为 0.72 ± 0.05 和 0.47 ± 0.03。在 NiMoAl 中添加 20 wt% MoS2、h-BN、Cr2AlC 和 Cr2AlCAg 将 COF 降低 (50% & 30%)、(47% & 45%)、(37% & 49%) 和 (64% & 66%)，分别在 RT 和 400 °C。磨损表面的表征表明，摩擦化学副产物如 Ni3S2、Cr7C3、Ag2MoO4 作为摩擦改进剂并降低 COF。NiMoAl-20 wt% Cr2AlC 涂层的 COF 随温度升高而大幅降低。