Chemically Bonded Phosphate Ceramics: I, A Dissolution Model of Formation

This is the first of three papers in which the kinetics of formation of chemically bonded phosphate ceramics is discussed. A literature survey indicates that the formation of such ceramics is a three‐step process. First, oxides dissolve in a phosphoric acid or an acid phosphate solution and metal io...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2003-11, Vol.86 (11), p.1838-1844
Main Authors: Wagh, Arun S., Jeong, Seung Y.
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
formation
Miscellaneous
modeling/model
phosphates
Technical ceramics
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Summary:This is the first of three papers in which the kinetics of formation of chemically bonded phosphate ceramics is discussed. A literature survey indicates that the formation of such ceramics is a three‐step process. First, oxides dissolve in a phosphoric acid or an acid phosphate solution and metal ions are released into the solution. The aquoions formed from these cations then react with phosphate anions and form a gel of metal hydrophosphates. In the last step, the saturated gel crystallizes into a ceramic. In this paper, we have proposed that the dissolution is the controlling step and developed a general dissolution model of the kinetics of formation of these ceramics. As an example, the model is used to discuss the kinetics of formation of magnesium phosphate ceramics in detail. In the second and third papers, the model has been used to develop processes to form ceramics of alumina and iron oxides.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.2003.tb03569.x