Using bone ash as an additive in porcelain sintering

Autor(es)

Gouvea, Douglas ; Kaneko, Taisa Tisse ; Kahn, Henrique ; Conceicao, Edilene de Souza ; Antoniassi, Juliana L.

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 41, n. 1, p. 10-pg., 2015-01-01.

Resumo

Calcined bovine bone (CBB) is generally used to manufacture high-quality porcelain known as bone china. In these products, the amount of bone ash is about 50%. However, it is known that CBB, in small quantities added to raw materials such as feldspars, can reduce the liquidus temperature and thus promote liquid-phase sintering. The purpose of this study was to evaluate the potential use of bone ash as a sintering promoter of porcelain made by a classical triaxial system. Hard porcelain was prepared with 0, 1, 2, and 5 wt% CBB and sintered at temperatures ranging from 1100 to 1400 degrees C. For the sample containing 2% CBB, the sintering temperature was reduced by 50 degrees C relative to 0% CBB, while the sample's tensile strength was the highest among all samples. Two mechanisms could be observed during porcelain sintering depending on CBB quantities: for 1 and 2% of CBB, the mullite formation determined the final shrinkage without changes on initial sintering temperatures; for 5% the initial sintering temperature was decreased by liquid formation. (C) 2014 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
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores