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On-line version ISSN 1678-4553
GOUVEA, D.; BERNARD, S.; ALATRISTA, G. A. V. and TOFFOLI, S. M.. Effect of calcination temperature on the properties of bovine bone ash for the fabrication of bone china. Cerâmica [online]. 2008, vol.54, n.329, pp.86-91. ISSN 1678-4553. http://dx.doi.org/10.1590/S0366-69132008000100012.
Calcined bovine bones comprise the main raw material for the fabrication of bone china (more than 50 wt.%). This special kind of porcelain has never been produced in Brazil. In this paper was investigated the influence of the following preparation steps: firing, grinding, and washing of the bones, on the physicochemical characteristics of the obtained bone ash particles. Powders calcined at temperatures between 700 and 1000 ºC, washed and ground, were analyzed in terms of their particle size distribution (laser scattering), chemical composition (X-ray fluorescence), density (He picnometry), specific surface area (BET method), infrared spectroscopy (FTIR-DRIFT), and were also observed by scanning electron microscopy. The results indicated that bones processed at different temperatures exhibit great homogeneity either in chemical terms (chemical composition and electrophoretic mobility) or in physical terms (particle size and phase composition), show slight increase in particle size with increasing firing temperatures, and must be calcined under oxidizing atmospheres in order to develop good processing characteristics.
Keywords : bone china; bone ash.