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首页> 外文期刊>Journal of Materials Engineering and Performance >Tribological Behavior of a Cr2O3 Ceramic Coating/Steel Couple Under Dry Sliding and Heavy Loading Conditions
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Tribological Behavior of a Cr2O3 Ceramic Coating/Steel Couple Under Dry Sliding and Heavy Loading Conditions

机译：干式滑动和重载条件下CR2O3陶瓷涂层/钢耦合的摩擦学行为

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摘要

This work evaluates the effects of heavy loadings on a Cr2O3 ceramic coating/steel couple under dry sliding and in conditions similar to those occurring in heavy-duty diesel engines. Two types of wear tests were performed by a standard pin-on-disc tribometer under high constant and variable loads. Before wear tests, microstructure and mechanical properties of coating and steel were determined by optical emission spectrometry, optical microscopy, roughness, microhardness and x-ray diffractometry (XRD). The friction coefficient was directly calculated by the tribometer. The wear rate of Cr2O3 ceramic coating was evaluated by the wear volume and that of pins by weighing them before and after tests. The wear tracks on pins and coating surfaces were analyzed by XRD and by scanning electron microscopy with energy-dispersive spectroscopy. For all loads except the lowest constant one, the results indicated high friction and wear involving material removal from the coating surface, through a severe-oxidational wear associated with extensive cracking of the surface of the coating, softening of the carburizing steel and removal of the carburized layer of pins. The wear mechanism was mild-oxidational under the lowest constant load, which was therefore suggested as the limit for acceptable performance of the sliding couple under study.
机译：这项工作评估了在干滑动下的CR2O3陶瓷涂层/钢耦合的重载和与重型柴油发动机中发生的条件相似的条件。在高常数和可变载荷下，标准销盘摩擦计是通过标准销盘摩擦计进行两种类型的磨损试验。在磨损之前，通过光发射光谱法，光学显微镜，粗糙度，微硬度和X射线衍射法（XRD）测定涂层和钢的微观结构和机械性能。摩擦系数由摩擦计直接计算。通过在测试之前和之后称重它们，通过磨损体积和销的磨损量和销的磨损率。通过XRD分析销和涂覆表面上的磨损轨道，并通过扫描电子显微镜，具有能量分散光谱。对于除恒定最低常数之外的所有负载，结果表明了涉及从涂层表面的材料去除的高摩擦和磨损，通过涂布表面的广泛破裂相关的严重氧化磨损，使渗碳钢软化并移除渗碳层的销。在最低恒定载荷下，磨损机构温和氧化，因此建议作为在研究下的滑动夫妇可接受性能的限制。

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