Abstract
Coatings of Al2O3, Al2O3-Y2O3, and Al2O3-YAG were developed using atmospheric plasma spraying techniques. Both composite coatings improved the toughness of the base Al2O3 coating, with the Al2O3-YAG showing the most significant enhancement. During friction tests with steel balls, adhesive wear was predominant, and the Al2O3-YAG coating demonstrated the lowest wear rate. However, when tested against WC balls, abrasive wear was more prevalent. The composite coatings reduced the friction coefficient and mitigated crack initiation and propagation, yet they showed higher wear rates. During the friction process, a phase transformation from α-Al2O3 to γ-Al2O3 was noted in the Al2O3 and Al2O3-Y2O3 coatings. In contrast, the Al2O3-YAG coating remained structurally stable without crystallization.
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