等离子喷涂与脉冲等离子爆炸复合涂层的氧化组织分析

采用等离子喷涂在镍基高温合金GH4049表面制备了CoNiCrAlY涂层,随后对涂层进行了脉冲等离子爆炸和真空预氧化处理,并对涂层进行了1050℃保温10 h和50 h的恒温静态氧化实验。结果表明:经过脉冲等离子爆炸处理后的涂层表面形貌更加平坦,脉冲等离子爆炸处理使得涂层表面的片层结构转变为致密结构,减少了氧气渗入涂层的通道,有效延缓了涂层的氧化过程,且没有改变涂层的化学成分;在1050℃空气中氧化50 h后,涂层的物相组成与未氧化处理的基本一致。

Analysis of oxidation microstructure of plasma sprayed and pulsed plasma detonation composite coatings

The CoNiCrAlY coating was prepared on the surface of a nickel-based high-temperature alloy GH4049 by plasma spraying, and then the coating was subjected to pulsed plasma detonation and vacuum pre-oxidation treatment as well as constant temperature static oxidation experiment at 1050 ℃ for 10 h and 50 h. The results show that the surface morphology of the coating after the pulse plasma detonation treatment is more flat. The pulse plasma detonation treatment makes the surface lamellar structure of the coating change into dense structure, reduces the channel of oxygen infiltration into the coating, effectively delays the oxidation process of the coating, and does not change the chemical composition of the coating. After oxidation at 1050 ℃ for 50 h in air, the phase composition of the coating is basically the same as that of the coating without oxidation treatment.