Medium and High entropy borides with high hardness and corrosion resistance are promising wear resistant materials. High temperature (>2000 °C) is always necessary for the densification of medium and high entropy borides. Using a mixture of 10 vol% metallic cobalt and 20 vol% SiC as additives, medium entropy (Ti,Zr,Ta)B ceramics were prepared at a relatively low temperature of 1600 °C by SPS. The reduced sintering temperature is attributed to the synergistic effect of Co and SiC that wet the grain boundary and promote the interdiffusion. The prepared (Ti,Zr,Ta)B obtains the microhardness of 22.54 ± 0.92 GPa, comparable with other medium entropy boride ceramics prepared at 2000 °C. The tribo-tests results of (Ti,Zr,Ta)B sliding against steel suggests that the tribological performance are load dependent. As the load increases, the friction coefficient first rises and then falls at a load of 10 N, which is associated with the chemical differences of the tribofilm. The tribofilm is primarily composed of O and Fe, along with Zr, Ti and Ta oxides. The iron oxide in the tribofilm will deteriorate the tribological performance. Abrasive wear is the main wear mechanism at lower load of 1 N, while adhesive wear is the predominant wear mechanism at 10 N.

中文翻译：

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1600℃相对低温致密化中熵硼化物(Ta,Zr,Ti)B2的摩擦学行为


中、高熵硼化物具有高硬度和耐腐蚀性，是很有前途的耐磨材料。中熵和高熵硼化物的致密化始终需要高温（>2000 °C）。以10 vol%金属钴和20 vol% SiC的混合物为添加剂，通过SPS在1600 ℃的较低温度下制备了中熵(Ti,Zr,Ta)B陶瓷。烧结温度的降低归因于Co和SiC润湿晶界并促进相互扩散的协同效应。制备的(Ti,Zr,Ta)B的显微硬度为22.54±0.92 GPa，与2000℃制备的其他中熵硼化物陶瓷相当。 (Ti,Zr,Ta)B 在钢上滑动的摩擦测试结果表明，摩擦性能与负载有关。随着载荷的增加，摩擦系数在载荷为10 N时先上升后下降，这与摩擦膜的化学差异有关。摩擦膜主要由 O 和 Fe 以及 Zr、Ti 和 Ta 氧化物组成。摩擦膜中的氧化铁会降低摩擦性能。磨粒磨损是 1 N 较低载荷下的主要磨损机制，而粘着磨损是 10 N 较低载荷下的主要磨损机制。