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Devitrification Behavior of Calcium Phosphate Glasses Containing Al2O3 and SiO2 Additives

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Abstract

The effects of Al2O3 and SiO2 additives on the crystallization of calcium phosphate glasses were studied. When the Al2O3 content was higher than 7 mol%, surface devitrification occurred in the glasses. However, for glasses with Al2O3 contents higher than 10 mol%, bulk devitrification predominanted. For the glasses with SiO2, a surface devitrification mechanism predominanted. Non-isothermal DTA techniques were applied in order to establish the devitrification mechanism, and the kinetic parameters of crystal growth were obtained. The parameter m depends on the mechanism and morphology of devitrification of calcium phosphate, glass containing SiO2 as additive, the values of m being lower than 1.2. These results indicate that the devitrification is controlled by the reaction at the glass-crystal interface, or occurs from surface nuclei.

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Authors and Affiliations

  1. Department of Material and Mineral Resources Engineering, National Taipei University of Technology, Taipei, Taiwan

    Jinn-Shing Lee & C.-K. Hsu

  2. Department of Chemistry, Chung Yuan Christian University, Chungli, Taiwan

    Jinn-Shing Lee & Chin-Wang Huang

  3. Chung Shan Institute of Science and Technology, P.O. Box 90008-15-9, Lungtan, 32026, Taiwan R.O.C

    Jinn-Shing Lee

Authors
  1. Jinn-Shing Lee
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  2. C.-K. Hsu
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  3. Chin-Wang Huang
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Lee, JS., Hsu, CK. & Huang, CW. Devitrification Behavior of Calcium Phosphate Glasses Containing Al2O3 and SiO2 Additives. Journal of Thermal Analysis and Calorimetry 56, 137–142 (1999). https://doi.org/10.1023/A:1010155913622

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  • DOI: https://doi.org/10.1023/A:1010155913622

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