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Adhesion of thermal barrier coatings - the development of metastable alumina

机译：隔热涂层的粘合-亚稳氧化铝的发展

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The adhesion of thermal barrier coatings (ThCs) is dependent upon the characteristics of the thermally grown oxide (TGO) that forms between the TBC and the corrosion resistant bond coal Work has been carried out to investigate the properties of the TGO as a function of ageing treatments using piezo-spectroscopy. Residual stress maps were generated for an electron beam physical vapour deposited (EB-PVD) TBC which showed a large variation in residual stress over the surface of a coated sample. The two peaks generally associated with a alumina (R1 and R2) frequently appear as doublets with a high and low stress component. In addition, the presence of a metastable #theta# alumina was detected in aged samples. It is believed that these observations can be related to incipient spallation of the TBC. The development of residual stress and the metastable oxide have been studied and correlated with the spallation behaviour of the TBC.
机译：隔热涂层（ThCs）的附着力取决于在TBC和耐腐蚀粘结煤之间形成的热生长氧化物（TGO）的特性。已经开展了研究TGO随老化而变化的性能的工作。压电光谱法进行治疗。产生了电子束物理气相沉积（EB-PVD）TBC的残余应力图，该图显示了涂层样品表面的残余应力有很大的变化。通常与氧化铝相关的两个峰（R1和R2）经常以具有高和低应力成分的双峰出现。另外，在老化的样品中检测到亚稳态＃θ氧化铝的存在。据信，这些观察结果可能与TBC的初期散裂有关。已经研究了残余应力和亚稳态氧化物的发展，并将其与TBC的散裂行为相关联。

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