Crack-Healing Behavior of Mullite/SiC Particle/SiC Whisker Multi-Composite and Mechanical Properties of the Multi-Composite

Abstract:

For improving fracture toughness as well as endowing with excellent self-crack-healing ability, mullite/SiC particles /SiC whiskers multi-composites were developed. Crack-healing ability and the mechanical properties of the specimens were investigated. Mullite/ 20 vol% SiC whiskers, mullite/ 25 vol% SiC whiskers and mullite/ 15 vol% SiC whiskers/ 10 vol% SiC particles composites can completely heal the pre-crack of 100 ım in surface length by heat-treatment at 1300 oC for 2 h in air. However, not completeness of the strength recovery was caused for mullite/ 15 vol% SiC whiskers composite by crack-healing. In spite of the same SiC content, the crack-healing ability of mullite/ 15 vol% SiC whiskers/ 10 vol% SiC particles composite is superior to that of mullite/ 25 vol% SiC whiskers composite. Admixing with SiC whisker was effective for improvement in fracture toughness. Additionally, the fracture toughness was not reduced by admixing with SiC particles.

• Periodical: Materials Science Forum (Volumes 475-479)
• Pages: 2071-2074
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.475-479.2071
• Online since: January 2005
• Authors: Wataru Nakao, Sang Kee Lee, Masahiro Yokouchi, Koji Takahashi, Kotoji Ando
• Keywords: Ceramics Based Composite, Fracture Strength, Mullite, Self-Crack-Healing, SiC Whisker

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