Avaliação do desempenho mecânico e análise microestrutural de revestimentos avançados de barreira térmica produzidos por aspersão térmica para aplicações aeroespaciais
Evaluation of mechanical behaviour and microstructural analysis of advanced thermal barrier coatings produced by thermal spraying for aerospace applications
Bianca Costa Rodrigues, Vera Lúcia de Óthero Brito, Leonardo Henrique Fazan, Cauã Willian de Souza Barbosa, Renata Jesuina Takahashi, Danieli Aparecida Pereira Reis
Resumo
Os revestimentos de barreira térmica (TBCs) são essenciais na indústria aeronáutica para proteger componentes de turbinas a gás contra altas temperaturas. Em sua composição, possuem uma camada cerâmica isolante (top coat), uma camada de óxido termicamente crescido (TGO) e uma camada metálica de ligação (bond coat), cuja aderência e resistência são influenciadas pelo processo de deposição. Neste sentido, este estudo comparou a microestrutura e propriedades mecânicas de TBCs cujos bond coats foram produzidos por aspersão térmica a plasma (APS) e por aspersão térmica a chama de alta velocidade (HVOF) sobre substrato de Ti-6Al-4V. Foram realizadas análises de microscopia óptica, indentação instrumentada para determinação de dureza e módulo de elasticidade, e medições de rugosidade superficial. Os resultados indicaram que o bond coat aplicado por HVOF apresentou melhor uniformidade e maior dureza (3,63 ± 0,74) GPa em comparação ao aplicado por APS (2,34 ± 0,85) GPa. Além disso, o top coat da amostra com bond coat por HVOF apresentou menor rugosidade, resultado da maior intensidade de corrente e melhor fusão das partÃculas. Portanto, a combinação de bond coat por HVOF e top coat por APS com maior corrente demonstrou alto potencial para aplicação em componentes aeronáuticos.
Palavras-chave
Abstract
Thermal Barrier Coatings (TBCs) are essential in the aeronautical industry to protect gas turbine components from high temperatures. In their composition, they have an insulating ceramic layer (top coat), an thermally grown oxide layer (TGO), and a metallic bond layer (bond coat), whose adhesion and strength are influenced by the deposition process. In this context, this study compared the microstructure and mechanical properties of TBCs with bond coats produced by Atmospheric Plasma Spray (APS) and High-Velocity Oxy-Fuel (HVOF) on a Ti-6Al-4V substrate. Analyses were conducted using optical microscopy, instrumented indentation to determine hardness and elastic modulus, and surface roughness measurements. The results indicated that the bond coat applied by HVOF exhibited better uniformity and higher hardness (3.63 ± 0.74) GPa compared to the one applied by APS (2.34 ± 0.85) GPa. Additionally, the top coat of the sample with the HVOF bond coat exhibited lower roughness due to higher applied current intensity and better particle fusion. Therefore, the combination of an HVOF bond coat and an APS top coat with higher current intensity demonstrated high potential for application in aeronautical components.
Keywords
References
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Submitted date:
04/02/2025
Accepted date:
09/16/2025
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