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Schematic diagram of the deposition process of the Al2O3 coating [18]: (a) and (b-I) The formation of Al(OH)3 colloidal particles; (b-II) Al(OH)3 dehydrates to form Al2O3; (c) Al2O3 melts to form a coating; (d) Injection, sintering and solidification of Al2O3; (e) Spark fading stage.
