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

Chii-Shyang Hwang, Ching yi Lin, Hung Hua Lu

Research output: Contribution to journalArticlepeer-review

Abstract

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 A-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, 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)632-636
Number of pages5
JournalJournal of the Ceramic Society of Japan. International ed.
Volume101
Issue number6
Publication statusPublished - 1993 Jun

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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