Tailoring sintering-resistant thermal barrier coatings by considering critical healing width of two-dimensional interlamellar pores

Large degradation in thermal insulation and strain tolerance is a main headache primary cause of failure for plasma-sprayed barrier coatings (TBCs) during service. One mechanism behind such the healing interlamellar pores formed by multiple connections between edges pore, which significantly speeds up exposure. The objective this study to obtain sintering-resistant TBCs tailoring width avoid connections. Firstly, responsible was revealed. splat surface before after treatments were characterized via atomic force microscopy. roughening pore occurs exposure, along with grain growth inside splats. Consequently, local height increases, causes pores. Secondly, critical widths exposure established correlating extent individual grains. increase size found temperature duration. A relationship linking induced ceramic splats obtained. Finally, composite prepared form wide coatings. Using design, increases conductivity elastic modulus can be prevented large extent. Thus, that maintain high tolerance, even long created.