摘要
综述了热障涂层(TBC)系统的3界面,即陶瓷层/热生长氧化膜(TGO)界面、TGO/粘结层界面及粘结层/基体界面,在高温服役条件下氧化和互扩散行为的研究现状;分析、讨论了控制界面反应和互扩散的3种方法,包括添加Pt/Hf等合金元素、施加界面扩散障及开发新粘结层。指出:粘结层的性能优劣是控制TGO防护性及界面互扩散从而延长TBC使用寿命的关键,而在多种改善TBC界面互扩散方法中,尤以美国和日本科学家研发的连续拓扑密堆积(TCP)型σ相扩散障(如Re-NiI、r-Ta及Ni-Hf等)的性能最优;同时指出采用含Pt-Hf的γ-γ′相合金、或与基体同成分的纳米晶涂层作为新粘结层来控制界面互扩散也有望获得进一步发展。
The research status quo of interracial reactions and interdiffusion at three interfaces of top coat （TC）/thermally growth oxides （TGO）, TGO/bond coat and bond coat/substrate of a thermal barrier coating（TBC） system at elevated temperatures were reviewed. Three kinds of special methods for controlling interracial reaction and interdiffusion include adding Pt/Hf and orther alloying elements, applying interracial diffusion barrier, and developing new binder were analyzed and discussed. It is pointed out that, the quality of bond coat is the key for controlling interracial diffusion and protective ability of TGO, and thereby extending the service life of TBC. However among these methods for improving interracial diffusion of TBC, the continuous topologically close-packed a phase diffusion barrier, such as Re-Ni, NiHf, etc, developed by the scientists from USA and Japan is yet the best one. Meanwhile, using γ-γ′ phase alloy containing Pt-Hf and nanocrystalline coating with identical composition to substrate as novel bond coat to control interracial diffusion could be developed further .
出处
《粉末冶金材料科学与工程》
EI
2007年第2期63-69,共7页
Materials Science and Engineering of Powder Metallurgy
关键词
热障涂层
界面互扩散
扩散障
γ-γ′涂层
thermal barrier coatings
interracial behaviors
diffusion barrier
γ-γ′ coating
