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A study on devitrification and nucleation of calcium phosphate glass with Si3N4additive

Authors
Journal
Thermochimica Acta
0040-6031
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/s0040-6031(02)00098-9
Keywords
  • Devitrification
  • Si3N4Additive
  • Nucleation

Abstract

Abstract The devitrification phenomenon and nucleation of CaO/P 2O 5 glass with Si 3N 4 additive was investigated using thermal analysis techniques. To determine whether the devitrification begins at the surface or in the bulk of these glasses, we compared the exothermic peak temperature of DTA curves for coarse and fine particles, and it was found that the devitrification mechanism of CaO/P 2O 5 glass would change by adding Si 3N 4 powder. The addition of Si 3N 4 additive will induce the calcium phosphate glass to surface nucleation mechanism in this work, and the temperature of exothermic peak of DTA curves for calcium phosphate glass were also shift to higher temperature by increasing the weight percentage of Si 3N 4. On the other hand, the nucleation rate of calcium phosphate was decreased with increasing the weight percentage of Si 3N 4.

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