Alumina-mullite-zirconia composites .2. Microstructural development and toughening
SCIE
SCOPUS
- Title
- Alumina-mullite-zirconia composites .2. Microstructural development and toughening
- Authors
- Jang, HM; Cho, SM; Kim, KT
- Date Issued
- 1997-01-15
- Publisher
- CHAPMAN HALL LTD
- Abstract
- Densification characteristics and fracture toughness of the alumina-mullite-zirconia (AMZ) composites fabricated by the colloidal mixing route were examined. The densification of boehmite-silica-zirconia precursor compacts was characterized by three distinct stages. Stage I was represented by a rapid shrinkage between 1100 and 1300 degrees C and was caused by the viscous flow sintering of the SiO2 component. Stage II was characterized by a temporary cessation of the shrinkage caused by the mullitization. Stage III was represented by a restoration of the shrinkage for temperatures above 1450 degrees C. The alpha-Al2O3 seeding facilitated the formation of elongated grains in the AMZ composites, and these elongated grains correspond to alpha-Al2O3. The toughening caused by the microcrack nucleation was comparable to that by the t --> m martensitic transformation and increased with increasing total content of zirconia.
- Keywords
- BRITTLE MATERIALS; LIQUID-PHASE; GRAIN-GROWTH; TRANSFORMATION; MORPHOLOGY; POWDERS; AL2O3
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/21393
- DOI
- 10.1023/A:1018590408443
- ISSN
- 0022-2461
- Article Type
- Article
- Citation
- JOURNAL OF MATERIALS SCIENCE, vol. 32, no. 2, page. 503 - 511, 1997-01-15
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- There are no files associated with this item.
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