Abstract Boron nitride (BN) shows obvious anti-wear performance as additives in lubricants, ceramics and polymers, however, the strong interlayer interactions lead to the weak anti-friction effect compared to those of carbon-based materials. In this work, we obtained the hydroxylated BN (BNO) via annealing the bulk material in air at high temperature. Utilizing the self-polymerization reactions of dopamine (DA) on the hydroxyls of BNO, the polydopamine (PDA) modified BNO (BNO-PDA) was formed, which has a good dispersity in water. The tribological tests indicate that both the hydroxylation and PDA modification can effectively lower the coefficient of friction (COF) and wear rate of the BN as additives in water, but the letter seems to present lower COF values when the testing time is increased. We also studied the influence of polymerization time on the tribological behaviors of BNO-PDA, and it was concluded that the 6 h modification gained the lowest wear rate and the 24 h modification yielded the lowest average COF value. It is believed that the favorable tribological performance of BNO-PDA as additives in water lubrication is resulted from the improved dispersity and the formation of organic layers on the surface of BN.

中文翻译：

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通过仿生聚多巴胺改性增强氮化硼的摩擦学性能

摘要 氮化硼（BN）作为添加剂在润滑剂、陶瓷和聚合物中表现出明显的抗磨性能，但与碳基材料相比，其强的层间相互作用导致其减摩效果较弱。在这项工作中，我们通过在空气中高温退火散装材料获得了羟基化的 BN (BNO)。利用多巴胺（DA）在BNO羟基上的自聚合反应，形成了聚多巴胺（PDA）改性的BNO（BNO-PDA），在水中具有良好的分散性。摩擦学测试表明，羟基化和PDA改性都可以有效降低BN作为添加剂在水中的摩擦系数（COF）和磨损率，但随着测试时间的增加，该字母似乎表现出较低的COF值。我们还研究了聚合时间对 BNO-PDA 摩擦学行为的影响，结论是 6 小时改性获得最低磨损率，24 小时改性产生最低平均 COF 值。据信，BNO-PDA作为水润滑添加剂的良好摩擦学性能是由于BN表面分散性的改善和有机层的形成。