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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Surface modification of bovine bone ash prepared by milling and acid washing process

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Autor(es):
Gouvea, Douglas [1] ; Alatrista, Gerardo A. V. [1] ; Brito, Silvio L. M. [1] ; Castro, Ricardo H. R. [2] ; Kahn, H. [3]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Met & Mat Engn, Escola Politecn, BR-05508900 Sao Paulo - Brazil
[2] Univ Calif Davis, Chem Engn & Mat Sci Dept, Davis, CA 95616 - USA
[3] Univ Sao Paulo, Dept Mining & Petr Engn, Escola Politecn, BR-05508900 Sao Paulo - Brazil
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: CERAMICS INTERNATIONAL; v. 35, n. 8, p. 3043-3049, DEC 2009.
Citações Web of Science: 2
Resumo

Bovine bone ash is the main raw material for fabrication of bone china, a special kind of porcelain that has visual and mechanical advantages when compared to usual porcelains. The properties of bone china are highly dependent on the characteristics of the bone ash. However, despite a relatively common product, the science behind formulations and accepted fabrication procedures for bone china is not completely understood and deserves attention for future processing optimizations. In this paper, the influence of the preparation steps (firing, milling, and washing of the bones) on the physicochemical properties of bone ash particles was investigated. Bone powders heat-treated at temperatures varying from 700 to 1000 degrees C were washed and milled. The obtained materials were analyzed in terms of particle size distribution, chemical composition, density, specific surface area, FTIR spectroscopy, dynamic electrophoretic mobility, crystalline phases and scanning electron microscopy. The results indicated that bone ash does not significantly change in terms of chemistry and physical features at calcination temperatures above 700 degrees C. After washing in special conditions, one could only observe hydroxyapatite in the diffraction pattern. By FTIR it was observed that carbonate seems to be mainly concentrated on the surface of the powders. Since this compound can influence in the dispersion stability, and consequently in the quality of the final bone china product, and considering optimal washing parameters based on the dynamic electrophoretic mobility results, we describe a procedure for surface cleaning. (c) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

Processo FAPESP: 05/55335-0 - Sinterização de materiais cristalinos
Beneficiário:Ricardo Hauch Ribeiro de Castro
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores
Processo FAPESP: 03/12721-2 - Desenvolvimento do processo nacional para a fabricação de porcelana de ossos - bone China
Beneficiário:Douglas Gouvêa
Linha de fomento: Auxílio à Pesquisa - Regular