一种钴基合金高温微动磨损行为的理解与形式化
Understanding and formalization of the fretting-wear behavior of a cobalt-based alloy at high temperature
摘要：
本研究的目的是探讨在高温下钴基界面的磨损机制。所研究的接触是钴基合金对氧化铝样品进行微动磨损。在高温下，在界面处自发产生保护性的第三体，并呈现出优异的摩擦学性能。所谓的“釉层”的形成导致没有磨损。本研究对高温摩擦膜的微观结构、化学性质和力学性能进行了全面的描述。釉层状态主要与阈值温度有关，在该阈值温度以上，通过摩擦烧结工艺形成薄的富钴层。提出了一种形式化的摩擦烧结过程来预测所需的微动循环次数N GL，以形成釉层。摩擦烧结工艺通过连续地将磨损碎片颗粒重新结合到釉层中来防止磨损碎片喷射。从宏观角度看，磨屑的重新结合可能是磨损界面不存在磨损的原因。最后，本文提出了一个扩展的摩擦能磨损的方法，考虑到摩擦氧化和摩擦烧结的考虑。该配方是能够预测磨损的摩擦学参数（温度，频率，滑动振幅，循环次数）的大范围内，当应用到钴基/氧化铝接触。
英文摘要：
The purpose of this study is to investigate the mechanisms involved in the wear of cobalt-based interfaces at high temperature. The studied contact is a cobalt-based alloy subjected to fretting against an alumina sample. At high temperature, a protective third body is spontaneously created at the interface and presents excellent tribological properties. The formation of the so-called ''glaze layer'' leads to an absence of wear. The investigation presents on complete description of the hightemperature tribolayer with microstructural, chemical and mechanical characterizations. The glaze layer regime is mainly related to a threshold temperature above which a thin cobalt-rich layer is formed by a tribo-sintering process. A formalization of the tribo-sintering process is proposed to predict the necessary number of fretting cycles N GL to form the glaze layer. The tribo-sintering process prevents wear debris ejection by continuously re-incorporating the wear debris particles in the glaze layer. The re-incorporation of the wear debris may be the reason for the absence of wear of the fretted interface from a macroscopic point of view. Finally, the paper presents an extended friction energy wear approach taking into account tribo-oxidation and tribo-sintering considerations. The formulation is able to predict wear for a large range of tribological parameters (temperature, frequency, sliding amplitude, number of cycles), when applied to the Co-based/alumina contact.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
