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- Title
Crack-healing and mechanical behaviour of Al<sub>2</sub>O<sub>3</sub>/SiC composites at elevated temperature.
- Authors
Ando, K.; Kim, B.-S.; Chu, M.-C.; Saito, S.; Takahashi, K.
- Abstract
Alumina/silicon carbide (Al2O3/SiC) composite ceramics with large self-crack-healing ability, high strength and high heat-resistance limit temperature for strength were developed and subjected to three-point bending. A semicircular surface crack 100 μm in diameter was made on each sample. Crack-healing behaviour was systematically studied, as functions of crack-healing temperature and healing time, and the fatigue strengths of the crack-healed sample at room temperature and 1373 K were investigated. Four main conclusions were drawn from the present study. (1) Al2O3/SiC composite ceramics have the ability to heal after cracking from 1273to 1673 K in air. (2) The heat-resistance limit temperature for strength of the crack-healed sample is ≅1573 K, and ≅68% of the samples fractured from outside the crack-healed zone in the testing-temperature range 873–1573 K. (3) The crack-healed sample exhibited very high fatigue limit at room temperature and also 1373 K. (4) The large self-crack-healing ability is a desirable technique for the high structural integrity of ceramic component.
- Subjects
MATERIAL fatigue; DYNAMIC testing of materials; POTTERY; ALUMINUM oxide; SILICON carbide; CONSTRUCTION materials
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2004, Vol 27, Issue 7, p533
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/j.1460-2695.2004.00785.x