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采用电热爆炸喷涂和等离子喷涂联合制备热障涂层,以电热爆炸喷涂法在DZ125合金表面制备NiCoCrAlY粘结层,以等离子喷涂技术制备陶瓷顶层。利用扫描电镜(SEM)和X射线衍射(XRD)仪对所制备的粘结层进行分析,结果表明:电热爆炸喷涂的粘结层与基体结合良好,喷涂态的粘结层的相主要由Ni3Al组成。采用联合法制备的热障涂层,在喷涂态的陶瓷层、粘结层、基体3者结合良好,界面清晰。在高温热循环过程中,粘结层/陶瓷层界面间生成了连续、致密的Al2O3膜,阻碍粘结层的氧化。粘结层/TGO界面产生平行于界面的裂纹,是导致热障涂层失效的主要原因。
The thermal barrier coating was prepared by electrothermal explosion spraying and plasma spraying. The NiCoCrAlY bonding layer was prepared on the surface of DZ125 alloy by electrothermal explosion spraying method. The top layer of ceramic was prepared by plasma spray technique. The results of SEM and XRD showed that the bonding layer of the electrothermal explosion spray bonded well with the substrate. The phase of the sprayed bonding layer mainly consisted of Ni3Al composition. The thermal barrier coating prepared by the united method has a good combination of the ceramic layer, the adhesive layer and the matrix 3 in the spraying state, and the interface is clear. During the high temperature thermal cycling, a continuous and dense Al2O3 film was formed between the interface of the adhesive layer and the ceramic layer, hindering the oxidation of the adhesive layer. The bonding layer / TGO interface produces cracks parallel to the interface, which is the main reason for failure of the thermal barrier coating.