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Friction transitions and connections to third bodies for a Cd coating on steel substrate
Friction ( IF 6.8 ) Pub Date : 2020-02-21 , DOI: 10.1007/s40544-019-0333-z
Priyadarshi Behera , Lisa Lee , Sriraman K. Rajagopalan , Richard R. Chromik , Stephen Yue

Cd coating is used in aerospace industries from last five decades due to its sacrificial protection and lubrication properties. Although Cd coating is primarily used due to its sacrificial corrosion protection when applied on steel substrate, the added benefit of modifying the tribological behavior by acting as a lubricious layer gives it a leading-edge than other coatings. Often the measurement of friction coefficient (CoF) is reported as a value generated after full sliding cycle. This measurement of average CoF generally limits the study of local variation in CoF occurring within one sliding cycle, which can be significantly different with change in spatial position due to change in third body morphology. In this study, a linearly reciprocating sliding test is used to measure the CoF at a sampling rate of 800 Hz along the track length to generate triboscopic image with steel countersphere. The instantaneous CoF obtained with triboscopy is correlated with the wear track morphology using scanning electron microscope (SEM) and optical profilometer for variation in contact conditions. Tribological test performed in dry atmosphere shows an average CoF of 0.4 till the end of the test whereas with increase in relative humidity to 60%, the average CoF changes from 0.4 to 0.8 at the end of the test due to change in contact conditions. Soft Cd coating on low carbon steel substrate is used to study these variations in third body morphology.

中文翻译:

摩擦跃迁和与第三体的连接,用于钢基底上的Cd涂层

由于其牺牲保护和润滑性能,镉涂料在过去的五十年中被用于航空航天工业。尽管主要使用Cd涂层是由于其在钢基材上具有牺牲腐蚀保护作用,但通过充当润滑层来改善摩擦学性能的额外好处使其比其他涂层具有领先优势。通常,将摩擦系数(CoF)的测量值报告为整个滑动周期后生成的值。这种平均CoF的测量值通常限制了对在一个滑动周期内发生的CoF局部变化的研究,该变化可能由于第三体形态的变化而随空间位置的变化而显着不同。在这个研究中,线性往复滑动测试用于沿着轨道长度以800 Hz的采样率测量CoF,以生成钢制反球面的摩擦镜图像。使用摩擦电子显微镜(SEM)和光学轮廓仪,通过摩擦学获得的瞬时CoF与磨损轨迹的形态相关,以改变接触条件。在干燥气氛中进行的摩擦学测试显示,直到测试结束,平均CoF为0.4,而随着相对湿度增加到60%,由于接触条件的变化,测试结束时平均CoF从0.4变为0.8。低碳钢基材上的软Cd涂层用于研究第三体形貌的这些变化。使用摩擦电子显微镜(SEM)和光学轮廓仪,通过摩擦学获得的瞬时CoF与磨损轨迹的形态相关,以改变接触条件。在干燥气氛中进行的摩擦学测试显示,直到测试结束,平均CoF为0.4,而随着相对湿度增加到60%,由于接触条件的变化,测试结束时平均CoF从0.4变为0.8。低碳钢基材上的软Cd涂层用于研究第三体形貌的这些变化。使用摩擦电子显微镜(SEM)和光学轮廓仪通过摩擦学获得的瞬时CoF与磨损轨迹形态相关,以改变接触条件。在干燥气氛中进行的摩擦学测试显示,直到测试结束,平均CoF为0.4,而随着相对湿度增加到60%,由于接触条件的变化,测试结束时平均CoF从0.4变为0.8。低碳钢基材上的软Cd涂层用于研究第三体形貌的这些变化。测试结束时由于接触条件的变化而出现8。低碳钢基材上的软Cd涂层用于研究第三体形貌的这些变化。测试结束时由于接触条件的变化而出现8。低碳钢基材上的软Cd涂层用于研究第三体形貌的这些变化。
更新日期:2020-02-21
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