Metastable Tetragonal Zirconia in the Zr02-YF3-Y01.5 System

Masahiro Yoshimura, Yoshio Okano, Shigeyuki Somiya

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

In the pseudo binary system ZrO2-YOF included in the ZrO2-YF3-Y01.5 ternary system, samples of 3.0~7.7 mol% YOF within the region of tetragonal single phase at 1300°C were isostatically hot-pressed at 1200°, 1300° and 1450°C under 200 MPa for 3 h after encapsulating into Pt capsule to avoid compositional changes. Only for ZrOa-7.7 mol%YOF, metastable tetragonal zirconia single phase was obtained as a sintered body. For the other samples (<7.7 mol%YOF) whole or most of the tetragonal phase transformed diffusionlessly to monoclinic phase during cooling. X-ray study showed that the unit cell of the tetragonal phase has larger axial ratio (c/a), and that of the monoclinic phase was more distorted (larger ß) than that in the Zr02-Y01.5 system. According to the measurement by DTA on encapsulated specimens, the tetragonal phase in the ZrO2-YOF system transformed at higher temperatures than that in the ZrO2-Yo1.5 system. This seems to be caused by more distorted cells of the tetragonal and the monoclinic phases as the result of F- doping. Stress induced transformation was confirmed for the metastable tetragonal phase of this YOF doped zirconia.

原文English
頁(從 - 到)441-444
頁數4
期刊Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
34
發行號9
DOIs
出版狀態Published - 1987

All Science Journal Classification (ASJC) codes

  • 機械工業
  • 工業與製造工程
  • 金屬和合金
  • 材料化學

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