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Tribological Performance and Tribofilm Evolution of TiAl Matrix Composites with Silver and Titanium Diboride at Elevated Temperatures
Journal of Materials Engineering and Performance ( IF 2.3 ) Pub Date : 2020-09-17 , DOI: 10.1007/s11665-020-04936-1
Bin Chen , Zengshi Xu , Yi Liu , Bing Xue , Weidong Ma

In order to understand the anti-friction and anti-wear mechanisms of silver (Ag) and titanium diboride (TiB2) at elevated temperatures, the tribological performance and tribofilm evolution of TiAl matrix composites with Ag and TiB2 (TATs) are studied from 200 to 800 °C. The results illustrate that TATs exhibit excellent friction-reducing and anti-wear properties, which are attributed to the self-adjusted synergistic effect of Ag and TiB2 in the wide temperature range. Besides, the testing temperatures have strong influence on the chemical structure and evolution of tribofilms. Within 400 °C, Ag migrates to worn surface and mixes with TiB2 to form the Ag-rich tribofilms. At 600 °C, the lubricating effect of Ag diminishes and the oxidation of TiB2 is limitation, hence there is no well-consolidated tribofilm on the worn surface. At 800 °C, Ag loses the lubricating capacity, while TiB2 completely oxidizes to form B2O3, resulting in the formation of B2O3-rich tribofilms.



中文翻译:

银和二硼化钛的TiAl基复合材料在高温下的摩擦学性能和摩擦膜演变

为了了解高温下银(Ag)和二硼化钛(TiB 2)的减摩和抗磨机理,研究了含Ag和TiB 2(TATs)的TiAl基复合材料的摩擦学性能和摩擦膜演变。200至800°C。结果表明,TAT具有优异的减摩和抗磨性能,这归因于Ag和TiB 2在较宽的温度范围内的自我调节的协同作用。此外,测试温度对摩擦膜的化学结构和演变有很大影响。在400°C内,Ag迁移到磨损的表面并与TiB 2混合形成富含银的摩擦膜。在600°C下,Ag的润滑作用减弱,并且TiB 2的氧化受到限制,因此在磨损表面上没有牢固固结的摩擦膜。在800°C下,Ag失去润滑能力,而TiB 2完全氧化形成B 2 O 3,从而形成富含B 2 O 3的摩擦膜。

更新日期:2020-09-18
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