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功能梯度涂层能提高涂层与基体间的结合力、耐磨性,以往对铜基体上喷涂功能梯度涂层的研究较少。用等离子喷涂法,在铜基体上制备了ZrO2-NiCrAlY梯度涂层。利用扫描电镜对涂层的组织形貌、成分进行了分析,对涂层的结合强度和抗热震性能进行了试验研究,并对试样进行了高温扩散处理。结果表明,梯度涂层设计合理,实现了成分和组织的连续梯度变化;与双层涂层相比,梯度涂层的结合强度和抗热震性有显著提高,涂层的结合以机械结合为主,梯度涂层内部是基体-涂层体系中最薄弱的环节;600℃热处理后,基体与涂层之间出现了扩散层。
Functionally graded coating can improve the bonding strength and wear resistance between the coating and the substrate. In the past, there were few researches on the functionally graded coating sprayed on the copper substrate. The ZrO2-NiCrAlY gradient coating was prepared on the copper substrate by plasma spraying. The microstructure and composition of the coating were analyzed by scanning electron microscopy. The bonding strength and thermal shock resistance of the coating were studied and the samples were treated by high temperature diffusion. The results show that the design of gradient coating is reasonable and the continuous gradient changes of composition and structure are achieved. Compared with double coating, the bonding strength and thermal shock resistance of gradient coating are significantly improved. The main, gradient coating inside is the matrix - the weakest link in the coating system; After 600 ℃ heat treatment, the diffusion layer between the substrate and the coating.