Influence of La2O3 addition on thermophysical properties of ZrO2-4 mol %Y2O3 ceramics fabricated by spark plasma sintering

• JANG Byung-Koog

  High Temperature Materials Unit, National Institute for Materials Science

• KIM Seongwon

  Korea Institute of Ceramic Engineering and Technology

• OH Yoon-Suk

  Korea Institute of Ceramic Engineering and Technology

• KIM Hyung-Tae

  Korea Institute of Ceramic Engineering and Technology

• SAKKA Yoshio

  Materials Processing Unit, National Institute for Materials Science

• MURAKAMI Hideyuki

  High Temperature Materials Unit, National Institute for Materials Science

抄録

The influence of La₂O₃ addition on the thermal diffusivity and thermal conductivity of ZrO₂ ceramics has been investigated. Porous and dense ZrO₂ ceramics were fabricated by spark plasma sintering at 1100 and 1500°C. The porosity of ZrO₂ ceramics sintered at 1100°C increased with increasing 0–5 mol % La₂O₃ addition. In contrast, ZrO₂ ceramics sintered at 1500°C showed full density regardless of the amount of La₂O₃ addition. The La₂Zr₂O₇ of crystalline pyrochlore phase was formed by reaction between La₂O₃ and ZrO₂. The XRD peak of the La₂Zr₂O₇ phase increased with increasing La₂O₃ addition. The thermal diffusivity and thermal conductivity of sintered ZrO₂ decreased with increasing La₂O₃ addition. In addition, the thermal conductivity of the present samples decreased remarkably with increasing the porosity.

収録刊行物

• Journal of the Ceramic Society of Japan

  Journal of the Ceramic Society of Japan 119 (1396), 929-932, 2011

  公益社団法人 日本セラミックス協会

キーワード

• ZrO₂
• La₂O₃
• La₂Zr₂O₇
• Thermal conductivity

詳細情報

• CRID: 1390001205287723264
• NII論文ID: 130002067670
• DOI: 10.2109/jcersj2.119.929
• ISSN: 13486535
• ISSN: 18820743
• Web Site: http://www.jstage.jst.go.jp/article/jcersj2/119/1396/119_1396_929/_pdf
• 本文言語コード: en
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