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首页> 外文期刊>Journal of Materials Engineering and Performance >Sliding Wear Behavior of Cast Iron: Influence of MoS_2 and Graphite Addition to the Oil Lubricant
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Sliding Wear Behavior of Cast Iron: Influence of MoS_2 and Graphite Addition to the Oil Lubricant

机译：铸铁的滑动磨损行为：MoS2和石墨对润滑油的影响

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摘要

The present study discusses sliding wear characteristics of a gray cast iron over a range of applied loads in oil lubricated condition. Effects of MoS_2 and graphite addition to the oil lubricant in governing the wear behavior have also been studied. The wear rate increased with load in general with a few exceptions in the case of oil plus 5% MoS_2 wherein it had a tendency to show a reverse trend in the intermediate load range. Addition of 5% graphite to the oil brought about a decrease in the wear rate without affecting seizure resistance. Increasing quantity of graphite in the oil from 5 to 10% practically did not affect the wear rate at lower loads. However, it led to significantly lower wear rates at higher loads and also offered higher seizure resistance. In the case of oil plus 5% MoS_2 lubricant mixture, the wear rate of the samples was higher than that of the lubricant with 5% graphite when tests were conducted at lower loads while identical response was observed at higher loads in both cases. Seizure resistance of the samples was not affected by the addition of 5% graphite and MoS_2 to the oil. The frictional heating also increased with load in general, except in the case of oil containing 5% MoS_2 and 10% graphite wherein it remained practically unaffected in the intermediate load range. The presence of 5% graphite and MoS_2 in the oil lubricant brought about reduced frictional heating, except in the case of oil plus 5% graphite mixture wherein the trend reversed, and oil plus 5% MoS_2 leading to comparable frictional heating during specimen seizure. Increasing test duration caused higher frictional heating. Adhesion was observed to be the principal wear mechanism while microcracking assisted delamination and abrasion also contributed to material loss.
机译：本研究讨论了在油润滑条件下，灰铸铁在一定载荷下的滑动磨损特性。还研究了向润滑油中添加MoS_2和石墨对控制磨损行为的影响。磨损率通常随载荷的增加而增加，除少数情况外，在油加5％MoS_2的情况下，磨损率在中等载荷范围内趋于显示出相反的趋势。在油中添加5％的石墨会导致磨损率降低，而不会影响耐咬合性。实际上，油中石墨的含量从5％增加到10％不会影响低负荷下的磨损率。但是，它导致在较高负载下的磨损率大大降低，并且还具有较高的抗咬合性。在油加5％MoS_2润滑剂混合物的情况下，当在较低负荷下进行测试时，样品的磨损率高于含5％石墨的润滑剂，而在两种情况下均观察到相同的响应。向油中添加5％的石墨和MoS_2不会影响样品的抗癫痫性。摩擦加热通常也随负载而增加，除了在油中含5％MoS_2和10％石墨的情况下，在中等负载范围内，摩擦加热实际上不受影响。油润滑剂中5％的石墨和MoS_2的存在降低了摩擦加热，但在油加5％的石墨混合物中趋势相反的情况下除外，而油加5％的MoS_2导致在样品捕获过程中产生了类似的摩擦加热。测试时间的延长会导致更高的摩擦发热。观察到粘附是主要的磨损机理，而微裂纹辅助的分层和磨损也造成了材料损失。

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