Effect of TiO2 doping on microstructural properties of Al2O3-based single crystal ceramics

Abali S.

JOURNAL OF CERAMIC PROCESSING RESEARCH, vol.12, no.1, pp.21-25, 2011 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 12 Issue: 1
  • Publication Date: 2011
  • Journal Name: JOURNAL OF CERAMIC PROCESSING RESEARCH
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.21-25
  • Keywords: Alumina, Alumina-tialite, Single crystal, Microstructure, MECHANICAL-PROPERTIES, AL2O3-AL2TIO5 SYSTEM, EUTECTIC COMPOSITE, ALUMINA, SOLIDIFICATION, RESISTANCE, STRENGTH
  • Çanakkale Onsekiz Mart University Affiliated: Yes

Abstract

Powders of Al2O3-TiO2 containing, 48 and 40% TiO2 by weight were formed into single crystals with a Verneuil furnace at 2088 K. Raman spectroscopy was used to determine the phase composition of the samples solidified from the Al2O3-TiO2 powder. The resulting beta-Al2TiO5-Al6Ti2O13, beta-Al2TiO5-Al2O3 single crystals were probed with micro hardness assays, scratch test analyses, atomic force microscopy (AFM), scanning electron microscopy (SEM), thermal expansion and four-point bending tests. It was observed that the alumina-tialite single crystal retained a composition of Al2O3-TiO2 containing 60% Al2O3 by weight and displayed optimum properties.