Simple and low-cost crack-healing of ceramic-based composites

ScienceDaily | 2/12/2019 | Staff
townskey13 (Posted by) Level 3
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Although various types of metal-ceramic composites have been researched and developed, their combination and fine structures were limited because of differences in ceramic-to-metal bonding types, chemical reactivity, and the particle size of commercially available metal powder.

This team overcame these restrictions by optimizing synthesis processes and sintering processes. In 2018, they produced Al2O3/Ti composites with a percolation structure by controlling the content of added Ti and optimizing the particle size of metallic Ti powder and sintering processes, improving fracture toughness and electrical conductivity of Al2O3/Ti composites.

Study - Researchers - Anodization - Al2O3/Ti - Composites

In this study, the researchers demonstrated that electrochemical anodization occurred in Al2O3/Ti composites. In addition, they developed a room-temperature healing method to heal cracks induced in Al2O3/Ti composites by using the anodization phenomenon without heat treatment, recovering the strength of the composites to their original level, a world first. The results of this research were published in the Journal of the American Ceramic Society.

To heal ceramics, crack-healing by chemical reaction (self-healing ability) has been studied, but a high-temperature treatment of 1,000? or higher was necessary to cause a chemical reaction and/or a diffusion reaction, so called re-sintering.

(Excerpt) Read more at: ScienceDaily
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