Self-Healing of SiC-Al(2)O(3)-B(4)C Ceramic Composites at Low Temperatures

Self-healing ceramics have been researched at high temperatures, but few have been considered at lower temperatures. In this study, SiC-Al(2)O(3)-B(4)C ceramic composite was compacted by spark plasma sintering (SPS). A Vickers indentation was introduced, and the cracks were healed between 600 °C and...

Descripción completa

Detalles Bibliográficos
Autores principales: Wang, Baoguo, Tu, Rong, Wei, Yinglong, Cai, Haopeng
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8781429/
https://www.ncbi.nlm.nih.gov/pubmed/35057369
http://dx.doi.org/10.3390/ma15020652
Descripción
Sumario:Self-healing ceramics have been researched at high temperatures, but few have been considered at lower temperatures. In this study, SiC-Al(2)O(3)-B(4)C ceramic composite was compacted by spark plasma sintering (SPS). A Vickers indentation was introduced, and the cracks were healed between 600 °C and 800 °C in air. Cracks could be healed completely in air above 700 °C. The ceramic composite had the best healing performance at 700 °C for 30 min, recovering flexural strength of up to 94.2% of the original. Good crack-healing ability would make this composite highly useful as it could heal defects and flaws autonomously in practical applications. The healing mechanism was also proposed to be the result of the oxidation of B(4)C.

Ejemplares similares