采用金相显微镜，SEM，EDAX，XRD等手段研究了1Cr18Ni9Ti基体上氧乙炔火焰喷涂制备的Al2O3/TiO2-NiCrBSi梯度热障涂层的微观结构。结果表明，涂层沿厚度方向陶瓷与合金组元较均匀过渡，二者之间结合良好。涂层制备过程中，陶瓷-合金组元之间没有发生化学反应，无新相生成。当两组元含量相差较大时，涂层形成以高组元为基体相，低组元为第二相弥散分布的复合结构；当两组元含量相近时，则以带状分布。
The microstructure of Al2O3/TiO2-NiCrBSi graded thermal barrier coatings produced by flame spraying processing on substrate of 1Cr18Ni9Ti has been studied by means of OPM，SEM，EDAX and XRD. The results show that Al2O3/TiO2 and Ni-base alloy is gradually transited along the direction of the coating, and the bond between Al2O3/TiO2 and Ni-base alloy is well made . There is no any chemical reaction between Al2O3/TiO2 and Ni-base alloy , no new phase is formed during spraying. A compound structure is formed in some layers when the content of one component is predominant, where the second phase is dispersed uniformly in the matrix. In other layers two phases are band-type.
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