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采用纳米掺杂(5%~30%)方法制备出纳米包覆微米级粒子的AT13等离子喷涂粉末,并利用大气等离子喷涂技术制备出了含有纳米复相结构的陶瓷涂层。在MM-200型磨损试验机上进行了常温干摩擦试验,比较了纳米复相结构涂层和传统陶瓷涂层的耐磨性能,利用扫描电镜观察了磨损后的磨痕形貌。结果表明,纳米复相涂层的耐磨性能明显好于传统陶瓷涂层,且随着磨损载荷的增大,纳米复相涂层和传统涂层的磨损机制的变化是不同的,传统涂层的磨损机理主要是微裂纹和颗粒的剥落,而相同条件下纳米复相涂层则由于涂层韧性的提高,主要表现为涂层的粘着磨损与局部剥落,并对纳米掺杂等离子喷涂涂层对AT13涂层磨损机制的影响进行了探讨。
The nano-doped (5% ~ 30%) method was used to fabricate AT13 plasma sprayed powders with nanometer-coated micron-sized particles and the ceramic coating with nanocomposite structure was prepared by atmospheric plasma spraying. The room temperature dry friction test was carried out on a MM-200 wear tester. The wear resistance of the nanocomposite and conventional ceramic coatings was compared. The wear scar morphology was observed by scanning electron microscopy. The results show that the wear resistance of the nanocomposite coating is obviously better than that of the traditional ceramic coatings. The wear mechanisms of the nanocomposite coatings and the conventional coatings are different with the increase of the wear resistance. The conventional coatings Of the wear mechanism is mainly microcracks and particles spalling, and under the same conditions, the nano-composite coating due to the improvement of toughness of the coating, the main performance of the coating adhesive wear and local spalling, and nano-doped plasma spray coating The AT13 coating wear mechanism was discussed.