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

Byung Koog Jang, Seongwon Kim, Yoon Suk Oh, Hyung Tae Kim, Yoshio Sakka, Hideyuki Murakami

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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 05 mol% La 2O3 addition. In contrast, ZrO2 ceramics sintered at 1500°C showed full density regardless of the amount of La 2O3 addition. The La2Zr2O 7 of crystalline pyrochlore phase was formed by reaction between La2O3 and ZrO2. The XRD peak of the La 2Zr2O7 phase increased with increasing La 2O3 addition. The thermal diffusivity and thermal conductivity of sintered ZrO2 decreased with increasing La 2O3 addition. In addition, the thermal conductivity of the present samples decreased remarkably with increasing the porosity.

Original languageEnglish
Pages (from-to)929-932
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume119
Issue number1396
DOIs
Publication statusPublished - 2011 Dec
Externally publishedYes

Keywords

  • Thermal conductivity

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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