Strength recovery and degradation behaviors in Al2O3-based self-healing ceramics with vanadium carbide additives

Taro Oshiumi; Toshio Osada; Masahiro Goto; Toru Hara

doi:10.1016/j.jeurceramsoc.2026.118276

Article Strength recovery and degradation behaviors in Al2O3-based self-healing ceramics with vanadium carbide additives

Taro Oshiumi ; Toshio Osada ; Masahiro Goto ; Toru Hara

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Taro Oshiumi, Toshio Osada, Masahiro Goto, Toru Hara. Strength recovery and degradation behaviors in Al2O3-based self-healing ceramics with vanadium carbide additives. Journal of the European Ceramic Society. 2026, 46 (10), 118276. https://doi.org/10.1016/j.jeurceramsoc.2026.118276

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Ceramic bearings possess superior thermal and mechanical properties but are prone to crack formation and lubricant degradation at high temperatures, driving the development of self-healing ceramics to improve their reliability and lifespan. This study investigates the high-temperature self-healing behavior of surface cracks in Al2O3-containing vanadium carbide (VC) particles and Al2O3 pre-incorporated with both SiC and VC particles as healing agents. Bending tests show that the required healing time for reaching the strength of 500 MPa in Al2O3 containing both VC and SiC achieves approximately 1/6000 times shorter than that in Al2O3-SiC composites without VC addition and significantly shorter than that of VC-added Al2O3. Excessive internal oxidation of pre-incorporated submicron- to micron-sized VC induces pore formation, reducing strength and hindering full-strength recovery. Formation of a SiO2 protective layer against SiC oxidation mitigates pore formation. These findings provide a basis for designing ceramics capable of rapid, low-temperature self-healing without pore generation.

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