Abstract

Anti-friction properties of solid lubricating coatings dedicated for the decrease in friction and increase in seizure resistance in the piston skirt–cylinder liner couple of high-forced combustion engines have been compared. Various modifications of coatings based on a polymer binder with addition of high-purity molybdenum sulfide and graphite have been deposited onto the segment surface. The graphite-based coating (foreign manufacturer), which is now successfully employed for steel pistons in diesels of heavy vehicles, has been used as the reference specimen. The studies were carried out at the friction temperature of 110°С in the range of normal loads of 50–450 N at a constant reciprocating frequency of 20 Hz, which is comparable to operating conditions of tribocoupling in diesel engines. Analysis of the results has shown that deposition of all coatings significantly decreases the friction coefficient, which amounts to 0.12–0.14 in some coatings (containing simultaneously molybdenum disulfide and graphite), which corresponds to the condition of contact of friction surfaces in the presence of lubricating material and the absence of direct metal contact in the friction couple.

中文翻译：

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柴油机活塞裙的固体润滑剂涂层的减摩性能评估

摘要

比较了专用于减少高功率内燃机的活塞裙-缸套对中的摩擦和增加抗咬合性的固体润滑涂层的减摩性能。基于聚合物粘合剂的涂料的各种改性方法，以及高纯度的硫化钼和石墨的添加，已经沉积到了段表面上。现在已成功地将石墨基涂料（国外制造商）用于重型车辆柴油机中的钢活塞，已用作参考样品。这项研究是在110°С的摩擦温度下，在50-450 N的正常载荷范围内，恒定的20 Hz往复频率下进行的，这与柴油发动机的摩擦联轴器的工作条件相当。