Microstructure and mechanical evaluation of yttrium phosphate-containing and lanthanum phosphate-containing zirconia laminates

Dong Hau Kuo, Waltraud M. Kriven

Research output: Contribution to journalConference articlepeer-review

Abstract

Eight types of oxide laminates consisting of combinations of xenotime (YPO4) with zirconia (ZrO2), and monazite (LaPO4) with ZrO2 were studied. Four of the laminates were YPO4-containing ZrO2 laminates. The other four materials were LaPO4-containing ZrO2 laminates. They were fabricated by repeatedly stacking two or three kinds of tape-cast layers, lamination, organic burnout and consolidation by hot-pressing. High strength (360, 390 MPa) and apparent work-of-fracture (WOF = 8.2, 10 kJ/m2) were measured in one of the YPO4-containing ZrO2 laminate in a stacking sequence of YPO4; yttria stabilized ZrO2 (Y-ZrO2); 30 vol% Y-ZrO2-70 vol% alumina (Al2O3); and Y-ZrO2. A toughening mechanism by means of residual, interlaminar shear stress-enhanced, interface delamination is proposed for these good results. One of the LaPO4-containing ZrO2 laminates, fabricated in a stacking sequence of LaPO4 and 70 vol% doped ZrO2-30 vol% Al2O3, displayed moderate strength and WOF.

Original languageEnglish (US)
Pages (from-to)129-136
Number of pages8
JournalCeramic Engineering and Science Proceedings
Volume18
Issue number4 B
StatePublished - Jan 1 1997
EventProceedings of the 1997 21st Annual Conference on Composites, Advanced Ceramics, Materials, and Structures-B - Cocoa, FL, USA
Duration: Jan 12 1997Jan 16 1997

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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