Abstract Dry sliding tests on pin on disc testing equipment were conducted on a new and developing SiC-graphite composite material, for racing applications, against WC-CoCr and WC-FeCrAlY HVOF coated discs. The coated discs were paired with the composite material to observe the friction coefficient and wear behavior at elevated testing conditions for potential applications in high intensity aerospace and train braking systems. The testing conditions included one constant contact pressure of 0.5 MPa, two sliding velocities of 1.57 and 7 m/s, and two working temperatures at room temperature (RT) and 300 °C (HT). The COF and pin wear increased with increase in velocity at RT conditions. Conversely, the COF and pin wear decreased with increase in velocity at HT testing conditions. For both the testing conditions, tests with WC-FeCrAlY coated disc provided for higher COF and wear compared to the tests with WC-CoCr coated disc. The friction layers on the worn pin surfaces were made by elements originating from the pin and also transferred from the disc and their extension increased with increase in velocity and testing temperatures. The disc surfaces were characterized by mild abrasive wear, in particular at HT and high sliding speed. A basic analysis on contact temperature was conducted to understand the mechanism of formation of friction layer for various testing systems. For RT testing conditions, due to low contact temperature, pin wear as well as uncompact friction layer were observed. However, as the contact temperature increased for HT tests accompanied by high velocity, a well compact friction layer with reduced COF and wear were noted.

中文翻译：

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速度和温度对 SiC-石墨复合材料对 WC-CoCr 和 WC-FeCrAlY HVOF 涂层干滑动行为的影响

摘要 针对 WC-CoCr 和 WC-FeCrAlY HVOF 涂层圆盘，对用于赛车应用的新型 SiC-石墨复合材料进行了销钉圆盘测试设备的干滑动测试。涂层盘与复合材料配对，以观察在高强度航空航天和火车制动系统的潜在应用的升高测试条件下的摩擦系数和磨损行为。测试条件包括一个 0.5 MPa 的恒定接触压力，两个 1.57 和 7 m/s 的滑动速度，以及室温 (RT) 和 300 °C (HT) 下的两个工作温度。在 RT 条件下，COF 和销磨损随着速度的增加而增加。相反，在 HT 测试条件下，COF 和销磨损随着速度的增加而减少。对于两种测试条件，与使用 WC-CoCr 涂层圆盘的测试相比，使用 WC-FeCrAlY 涂层圆盘进行的测试提供了更高的 COF 和磨损。磨损销表面上的摩擦层是由源自销的元素形成的，也从圆盘转移，它们的延伸随着速度和测试温度的增加而增加。盘表面的特点是轻度磨损，特别是在高温和高滑动速度下。对接触温度进行了基本分析，以了解各种测试系统摩擦层的形成机制。对于 RT 测试条件，由于接触温度低，观察到销磨损以及不致密的摩擦层。然而，随着 HT 测试的接触温度升高，伴随着高速，注意到摩擦层非常紧凑，COF 和磨损降低。