1. Comparative Study of Calcium Silicate Bulk Systems Produced by Different Methods.
- Author
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Sinkó, K., Meiszterics, A., and Rosta, L.
- Abstract
The aim of this study is to prepare bulk calcium silicate system that exhibits suitable properties to be used for biomedical applications. Glass-ceramics of composition CaO ω SiO
2 were produced by sol–gel technique starting from tetraethoxysilane and calcium nitrate tetrahydrate and by melt-quenching technique using a mixture of CaCO3 and SiO2 . The traditional power technology requires 1 500 °C temperature to produce ceramic bulks; contrarily the sol–gel technique 700 °C. Their structures were compared by means of thermoanalysis, X-ray diffraction, and small angle X-ray scattering. In the melt-quenched samples, the crystalline feature is dominated; the gel-derived samples are rather amorphous. The mechanical property of the calcium silicate materials obtained by different preparation routes were characterized by Brinell hardness test. The melt-quenching technology provides the glass-ceramics product with high mechanical strength at 1 500 °C; the gel derived products achieve this mechanical strength already after a heat treatment at 700 °C. The gel derived product prepared with ammonia catalyst proved to be the hardest, most compact matter. [ABSTRACT FROM AUTHOR]- Published
- 2008
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