Effects of Microstructure on Mechanical Properties of Alumina Ceramics Produced by Spark Plasma Sintering

• Yasuno Takuya

  College of Science and Engineering, Iwaki Meisei University

• Kawahara Masakazu

  SPS Syntex Inc.

• Kaiyama Yuki

  Iwaki Meisei University

• Makino Yukio

  SPS Syntex Inc.

• Kogo Yasuo

  Faculty of Industrial Science and Technology, Tokyo University of Science

Bibliographic Information

Other Title

• 放電プラズマ法により作製されたアルミナ焼結体の機械的性質に及ぼす微細組織の影響

Abstract

An ultrafine α-alumina powder was consolidated by spark plasma sintering (SPS) and the effect of microstructure on mechanical properties of the sintered compact was examined. The density and bending strength of sintered compact increased with sintering temperature and indicated the maximum value at 1573 K. In the temperature range higher than 1573 K, however, these properties decreased with the increase of sintering temperature. The changes of these properties were clarified by microstructural analysis using transmission electron microscope. It was indicated that the grain growth was fairly encouraged in the consolidation of alumina powder when the powder was consolidated at a sintering temperature higher than 1573 K. On the grain growth process, many fine pores occurred in the grains and/or on the grain boundaries. Further, the bending strength decreased remarkably so that larger pores existed on the grain boundaries at 1773 K.

Journal

• Journal of the Japan Society of Powder and Powder Metallurgy

  Journal of the Japan Society of Powder and Powder Metallurgy 59 (9), 544-548, 2012

  Japan Society of Powder and Powder Metallurgy

Keywords

• spark plasma sintering
• alumina
• bending strength
• microstructure
• grain growth

Details

• CRID: 1390282681288263552
• NII Article ID: 130003328435
• DOI: 10.2497/jjspm.59.544
• COI: 1:CAS:528:DC%2BC38XhsV2itL7J
• ISSN: 18809014
• ISSN: 05328799
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed