Enhancement of the Mechanical Properties of Alumina Ceramics by a Granulation Process and Y2Q3 Additive

In Gyu Song, Jung Sik Kim

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7 Scopus citations

Abstract

This study investigated the effect of powder granulation on the mechanical properties of sintered alumina ceramics. 2 wt% MgO was added to enhance the sintering process, and the effect of Y2O3 addition was investigated at various sintering temperatures (1450 °C, 1550°C and 1650°C) with a granulation process. The sintered density, flexural strength and Vicker's hardness were analyzed according to the amount of Y2O3 addition and the sintering temperature. The sintered density and mechanical properties of the sintered specimens with powder granulation was higher than the as-received commercial AI2O3 powders because granule powders uniformly filled the mold. The mechanical properties of strength and hardness for the sintered AI2O3 specimens increased with addition of Y2O3 up to 1 wt%, and then decreased beyond that. The 1 wt% Y2O3-added AI2O3 amples (sintered at 1650°C) had the maximum flexural strength of 363.53 MPa and a Vicker's hardness of 20.1 GPa.

Original languageEnglish
Pages (from-to)262-269
Number of pages8
JournalJournal of Korean Institute of Metals and Materials
Volume53
Issue number4
DOIs
StatePublished - 1 Apr 2015

Keywords

  • Ceramics
  • Mechanical properties
  • Sintering
  • X-ray diffraction

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