Characterization of Thermally Protective Al₂O₃-TiO₂ Coating Fabricated by Atmospheric Plasma Spraying Available to Purchase

In this study, Al₂O₃-based coatings with varying TiO₂ contents (0, 3, 13, and 40%) were fabricated using atmospheric plasma spraying technique. To compare the superiority of the samples, their thermal properties (thermal conductivity and thermal shock resistance) were characterized. As observed, Al₂O₃- 40%TiO₂ (A-40T) coating exhibited relatively superior thermal insulation and thermal shock resistance at 600°C. According to the microstructure and phase analysis, this finding can be attributed to the special phase, Al₂TiO₅, and the pre-existing microcracks inside the coating. Thus, A-40T manifested excellent characteristics for thermal insulation application compared with pure Al₂O₃ and low-TiO₂ content coatings.