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Alumina-mullite-zirconia composites .1. Colloidal processing and phase-formation characteristics

Title
Alumina-mullite-zirconia composites .1. Colloidal processing and phase-formation characteristics
Authors
Jang, HMCho, SMKim, KT
POSTECH Authors
Jang, HMKim, KT
Date Issued
Jan-1996
Publisher
CHAPMAN HALL LTD
Abstract
A boehmite-silica-zirconia precursor powder with a uniform spatial distribution of constitutive phases was prepared from the corresponding ternary sol by compressing the electrical double layer (EDL) without altering the magnitude of the surface potential at a pH of 3.5. Both the rheological data and the calculated potential energy of interaction indicated that the mixed ternary sol formed weakly coagulated units in a shallow potential energy well after the compression of EDL at a pH of 3.5. The effects of alpha-Al2O3 seeding on the phase-formation characteristics were then systematically examined. It was observed that the alpha-Al2O3 seeding facilitated the formation of alpha-Al2O3 but that it suppressed the growth of mullite in the alumina-mullite-zirconia composite. These observations were attributed to the epitaxial effect of alpha-Al2O3 seeds which preferentially induced the formation of corundum phase over mullite formation.
Keywords
POLYCRYSTALLINE MULLITE; TRANSFORMATION; DENSIFICATION; CERAMICS; CREEP; GELS; SIZE
URI
http://oasis.postech.ac.kr/handle/2014.oak/21477
ISSN
0022-2461
Article Type
Article
Citation
JOURNAL OF MATERIALS SCIENCE, vol. 31, no. 19, page. 5083 - 5092, 1996-01
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 JANG, HYUN MYUNG
Div of Advanced Materials Science
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