Effects of heat treatment on adhesion strength of thermal barrier coating systems

Effect of shot peening on the oxidation behavior of thermal barrier coatings

“…The production of thermal barrier coatings (TBCs), applied to improve the efficiency of hot section components like turbine blades, vanes and combustor parts in gas turbine engines, has been among the most attractive subjects in the field of high temperature applications in recent years [1][2][3][4]. Typically, a TBC system consists of bond coat (MCrAlY) and top coat (YSZ) above a super alloy substrate.…”

Revestimentos para barreira térmica: evolução e perspectivas

“…As trincas são devidas às tensões residuais provocadas pela oxidação da camada de ligação metálica em altas temperaturas (formação e crescimento da TGO), devido à permeabilidade da camada cerâmica porosa, e às diferenças de expansão térmica cíclica (fadiga térmica no aquecimento e resfriamento dos componentes, durante o serviço), resultantes da diferença de cerca de 30 % no coeficiente de expansão térmica entre a zircônia parcialmente estabilizada e a camada de ligação metálica [2,3,4]. Diversas pesquisas têm sido realizadas na busca de solucionar estes problemas, envolvendo, inclusive, o conceito de revestimentos graduados [19,20], pré ou pós-tratamentos dos revestimentos [21,22,23] e adição de dopantes [24,25].…”

On the performance and failure mechanism of thermal barrier coating systems used in gas turbine blade applications: Influence of bond coat/superalloy combination

“…Earlier studies have shown that the failure mechanism of a TBC is a function of the manufacturing techniques [18,19]. Coatings processed by plasma spray are found to fail by loss of adhesion between the TGO and top ceramic coat [20][21][22]. However, coatings processed by EP-PVD fail by loss of adhesion between the TGO and bond coat [23][24][25][26] as shown in the example of Fig.…”