Abstract
A novel Al2O3-GdAlO3(GAP) amorphous ceramic coating was in-situ prepared via atmospheric plasma spraying. The Al2O3/Gd2O3 sprayable powders possessed excellent sphericity and fluidity after heat treatment at 900 °C for 2 h with no solid-phase reaction, which indicated the Al2O3-GAP coating deposition process was greatly simplified. The Al2O3-GAP amorphous coating showed high glass transition temperature (1155.1 K), initial crystallization temperature (1179.2 K), local activation energy (847.6 kJ/mol) and nucleation resistance (88.3). Compared with almost all amorphous materials, the Al2O3-GAP amorphous coating possessed greater crystallization activation energy, which was conducive to its high temperature microstructure stability. Furthermore, the hardness and elastic modulus of Al2O3-GAP coating fluctuated with a tiny range as increasing the nanoindentation depth from 500 nm to 2000 nm with ten different nanoindentation experiments, which denoted excellent microstructure and mechanical performance uniformity of the coating. Therefore, the results showed that the Al2O3-GAP amorphous coating had better potentials for large-scale engineering application under harsh service conditions.Keywords: Plasma spraying; Amorphous oxides; Al2O3-GAP coating; High temperature microstructure stability; Performance uniformity
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