Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 56: Issue 1
Devitrification Behavior of Calcium Phosphate Glasses Containing Al2O3 and SiO2 Additives
Authors:
Jinn-Shing Lee

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C.-K. Hsu National Taipei University of Technology Department of Material and Mineral Resources Engineering Taipei Taiwan Taipei Taiwan

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Chin-Wang Huang Chung Yuan Christian University Department of Chemistry Chungli Taiwan Chungli Taiwan

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Pages:
137–142
Online Publication Date:
03 Nov 2004
Publication Date:
01 Jul 1999
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010155913622
Keywords:
Al2O3 and SiO2 additives; CaO/P2O5 glasses; devitrification behavior
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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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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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