采用磁控溅射方法在镍基单晶高温合金基体上沉积Ni-30Cr-12Al-0.3Y(质量分数,%)粘结层,采用电子束物理气相沉积方法(EB-PVD)沉积7%Y2O3(质量分数)-ZrO2陶瓷顶层.结果表明,在热循环过程中,非平衡相t′-ZrO2中的Y2O3含量逐渐减少,t′-ZrO2相逐渐分解成平衡相t-ZrO2(冷却时会转变成单斜相)和立方相ZrO2.1050℃循环200次,粘结层氧化物(Al2O3)厚度约为3 μm,表明Ni-Cr-Al-Y适宜作粘结层.继续热循环,陶瓷层中出现单斜相,粘结层中Al贫化,氧化层中出现NiO及尖晶石等,引起应力集中,导致涂层失效.
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