【摘要】 以TiB₂为添加剂,Al₂O₃为基体,制备了Al₂O₃/TiB₂陶瓷刀具材料。以该陶瓷刀具对淬硬钢进行高速干切削试验,利用其在切削高温作用下的摩擦化学反应,在刀具材料表面原位生成具有润滑作用的反应膜,从而实现Al₂O₃/TiB₂陶瓷刀具材料本身的高温自润滑。研究了Al₂O₃/TiB₂陶瓷刀具在切削高温作用下刀具表面的摩擦化学反应机理,分析了刀具表面自润滑膜的组成结构。结果表明:Al₂O₃/TiB₂陶瓷刀具在干切削淬硬钢时,当切削速度大于120 m/min时,开始表现出高温自润滑性能。自润滑膜的组成为Al₂O₃/TiB₂陶瓷刀具中TiB₂的氧化产物,它能在刀具表面起到固体润滑剂的作用,进而降低前刀面的摩擦因数,减轻刀具的粘着磨损,提高刀具的耐磨性能,具有良好的减摩和抗磨作用。更多还原

【Abstract】 Al2O3/TiB2 ceramic cutting tool is produced by hot pressing technique. Dry cutting tests are carried out on hardened steel with this ceramic tool. The tribological- chemical reaction and the oxide films on the tool face are studied. Results showed that self-lubrication took place when the cutting speed is higher than 120 m/min. The composition of the self-lubricating film is found to be the oxidation products of TiB2 grain, which can be act as the lubricating additives. Both the friction coefficient and the wear rates are reduced under these conditions. This self-lubricating ceramic tool can be used to reduce the friction-coefficient and to improve the wear resistance.更多还原