Abstract

In this article, the tribological behaviors of Si₃N₄-hBN composites and polyether ether ketone (PEEK) materials with precorrosion were investigated in seawater and deionized water, respectively. Si₃N₄-hBN composite represented a good seawater corrosion resistance, and a low corrosion rate of 0.0037 g/(m²·h) was obtained for Si₃N₄-hBN composites in seawater. The seawater absorption rate of PEEK material was about 0.726%, and the surface became rougher with precorrosion. Si₃N₄-hBN/PEEK pairs presented friction coefficients of around 0.20, and some reactive products (e.g., SiO₂ and H₃BO₃) formed on the surface. When the hBN content was equal to 10 wt%, more smooth worn surfaces were presented. In addition, the Si₃N₄-10% hBN/PEEK pair presented the lowest and most stable friction behavior. There were few changes in the Si₃N₄-hBN and PEEK materials before and after immersion in deionized water. The friction coefficients of the Si₃N₄-hBN/PEEK pair were all lowered than 0.1 in deionized water. The corresponding wear rates of pins and discs were all below the order of magnitude of 10⁻⁶ mm³/Nm. The excellent tribological characteristics were attributed to ultrasmooth surfaces (originated from the tribochemical reaction).

摘要

本文分别研究了Si ₃ N ₄ -hBN复合材料和具有预腐蚀作用的聚醚醚酮(PEEK)材料在海水和去离子水中的摩擦学行为。Si ₃ N ₄ -hBN复合材料表现出良好的耐海水腐蚀性能，Si ₃ N ₄ -hBN复合材料在海水中的腐蚀速率仅为0.0037 g / (m ² ·h) 。PEEK材料的海水吸收率约为0.726%，表面随着预腐蚀变得更粗糙。Si ₃ N ₄ -hBN/PEEK 对的摩擦系数约为 0.20，一些反应性产物（例如 SiO₂和 H ₃ BO ₃ ) 形成在表面上。当 hBN 含量等于 10 wt% 时，出现更光滑的磨损表面。此外，Si ₃ N ₄ -10% hBN/PEEK 对表现出最低和最稳定的摩擦行为。Si ₃ N ₄ -hBN 和 PEEK 材料在浸入去离子水中前后几乎没有变化。Si ₃ N ₄ -hBN/PEEK对的摩擦系数在去离子水中均低于0.1。相应的销和盘磨损率均低于10 ^-6 mm ³的数量级/牛米。优异的摩擦学特性归因于超光滑表面（源自摩擦化学反应）。