用HVOF(CoNiCrAlY)+ SFPB+APS(8YSZ)制备热障涂层,经1000 ℃高温氧化2, 26, 310 h后,用EDS和拉曼荧光光谱对涂层进行分析.高温氧化2 h,首先生成的是γ-Al2O3,此后,γ-Al2O3向α-Al2O3转化.拉曼荧光光谱检测和理论计算表明,高温氧化过程中,TGO中的微观热生长残余应力先增加后降低,310 h高温氧化后微观热生长残余应力比26 h高温氧化后的低0.476 GPa.SFPB技术使粘结层表层区域产生扩散"通道",高温氧化的瞬态阶段,大量比Al3+半径大的其它离子通过此扩散"通道",抑制了γ→θ→α的相变.最终形成了以α-Al2O3为主相的TGO抗高温氧化层.
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