Abstract The objective of this work was to study adaptive mechanisms and behavior of ZrB2-20 vol% SiC ultra high-temperature ceramics in low-speed and high-speed sliding against a high-carbon steel disk. The worn surfaces of ceramic samples were examined and characterized for chemical composition and mechanical properties. Intense tribooxidation of the composite components as well as transfer layer generation was observed at sliding speeds as high as 11 m/s, 22 m/s and 37 m/s with the formation of at least two subsurface layers. The first one was a mechanically mixed (transfer) layer composed of an iron-containing borosilicate glass mixed with the tribooxidation products resulted from oxidizing both ceramics and steel components. The second underlying layer was a partially oxidized zirconium diboride. Such a combination of quasi-viscous transfer layer and partially ductile underlying layer allowed reducing friction, forming a smooth worn surface and protecting the ceramics against brittle subsurface fracture. Also the effect of self-healing of the subsurface defects by means of liquid borosilicate glass was observed during sliding friction. The results obtained were discussed in comparison to other adaptation mechanisms found in different materials during friction.

中文翻译：

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ZrB2-SiС陶瓷复合材料高速滑动摩擦中摩擦氧化的适应性及自愈作用

摘要 本工作的目的是研究ZrB2-20 vol% SiC 超高温陶瓷在高碳钢盘上低速和高速滑动的适应性机制和行为。检查陶瓷样品的磨损表面并表征其化学成分和机械性能。在高达 11 m/s、22 m/s 和 37 m/s 的滑动速度下观察到复合组分的强烈摩擦氧化以及转移层的产生，并形成至少两个次表面层。第一个是机械混合（转移）层，由含铁硼硅酸盐玻璃与氧化陶瓷和钢部件产生的摩擦氧化产物混合组成。第二底层是部分氧化的二硼化锆。这种准粘性传递层和部分延展性底层的组合可以减少摩擦，形成光滑的磨损表面并保护陶瓷免受脆性亚表面断裂。在滑动摩擦过程中还观察到了通过液态硼硅酸盐玻璃对表面下缺陷进行自修复的效果。与摩擦过程中在不同材料中发现的其他适应机制相比，对获得的结果进行了讨论。