Microstructure and crystal phase development of Y2O 3-stabilized ZrO2 polycrystal fabricated by the solid phase mixing and sintering method

Hiroshi Ohnishi, Tetsurou Fukuhara, Toshio Kawanami, Tohru Sekino, Yuichi Ikuhara, Koichi Niihara

研究成果: Article査読

7 被引用数 (Scopus)

抄録

The microstructure and crystal phase in 2.8 mol% yttria-stabilized zirconia polycrystals were investigated. Starting powders were prepared by wet dispersing and mixing using an agitator mill or by the liquid phase precipitation method. The composites powders were sintered at 1275-1600°C and then analyzed. Solid phase method (SPM) powders showed higher sinterability than those of the liquid phase precipitation method (LPM) powders, and high density samples consisting of fine grains could be obtained at lower sintering temperatures than from LPM powders. Unlike the LPM sample, the cubic and tetragonal phase was formed in the SPM sample at low sintering temperature, because there was the region of high and low Y3+ ion concentration in the material. As the sintering temperature increased, the cubic phase decreased and tetragonal phase increased by the progress of the diffusion of Y 3+ ions. And then, Y3+ ions segregated at grain boundaries, and tetragonal grains containing cubic phase at grain boundary regions were formed. The thermal expansion curve for the SPM sample samples sintered at 1275°C exhibited a monoclinic to tetragonal transformation during the heating stage; however, the expansion was linear during the cooling stage, as was the case for both SPM samples sintered at higher temperatures and the LPM samples. The thermal expansion behavior of the SPM sample suggested that the monoclinic phase was essentially not present within the sample, although the transformed monoclinic phase in a surface layer by grinding stresses was exist.

本文言語English
ページ(範囲)210-215
ページ数6
ジャーナルJournal of the Ceramic Society of Japan
115
1339
DOI
出版ステータスPublished - 2007 3

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学

フィンガープリント

「Microstructure and crystal phase development of Y<sub>2</sub>O <sub>3</sub>-stabilized ZrO<sub>2</sub> polycrystal fabricated by the solid phase mixing and sintering method」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

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