Synthesis of spherical shape borate-based bioactive glass powders prepared by ultrasonic spray pyrolysis

Jung Sang Cho, Yun Chan Kang

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Spherical shape borate-based bioactive glass powders with fine size were directly prepared by high temperature spray pyrolysis. The powders prepared at temperatures between 1200 and 1400 °C had mixed phase with small amounts of fine crystal and an amorphous rich phase. Glass powders with amorphous phase were prepared at a temperature of 1500 °C. The mean size of the glass powders prepared by spray pyrolysis was 0.76 μm. The glass powders prepared at a temperature of 1200 °C had two distinct exothermic peaks (Tc1 and Tc2) at temperatures of 588 and 695 °C indicating crystallization. The glass transition temperature (Tg) of the powders prepared at a temperature of 1200 °C was 480 °C. Phase-separated crystalline phases with spherical shape were observed from the surface of the pellet sintered at a temperature of 550 °C. Crystallization of the pellet was completely occurred at temperatures of 750 and 800 °C. The pellets sintered at temperatures below 700 °C had single crystalline phase of CaNa3B5O10. The pellet sintered at a temperature of 800 °C had two crystalline phases of CaNa3B5O10 and CaB2O4.

Original languageEnglish
Pages (from-to)2103-2109
Number of pages7
JournalCeramics International
Volume35
Issue number6
DOIs
Publication statusPublished - 2009 Aug

Keywords

  • A. Powders: chemical preparation
  • A. Powders: gas phase reaction
  • D. Glass ceramics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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