Effect of SiO2 and TiO2 on the sinterability and microstructure of alumina ceramics

Chii shyang Hwang, Ching yi Lin, Hung hua Lu

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Effect of SiO2 and TiO2 additions on the phase formation, sinterability, and microstructure of alumina ceramics was studied by differential thermal analysis, X-ray powder diffractometry, SEM, TEM, and dilatometry. Alumina-based mixture powders were prepared from starting materials of α-Al2O3 powder, Si(OC2H5)4 and Ti(OC3H7)4. The silica gel obtained from the hydrolysis of Si(OC2H5)4 was coated on Al2O3 particles to form a thin surface layer. During the firing process, the silica gel didn't crystallize to cristobalite but reacted with Al2O3 to form mullite above 1500 °C. The silica gel, mullite and/or Al2O3-SiO2 liquid phase retarded the densification and the grain growth of alumina. As TiO2 was added to the alumina-silica gel mixture, the sinterability was enhanced and the formation temperature of mullite was lowered.

Original languageEnglish
Pages (from-to)649-653
Number of pages5
JournalNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
Issue number1174
Publication statusPublished - 1993

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry


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