Strength‐Toughness Relations in Sintered and Isostatically Hot‐Pressed ZrO2‐Toughened Al2O3

SABURO HORI, MASAHIRO YOSHIMURA, SHIGEYUKI SŌMIYA

研究成果: Article同行評審

76 引文 斯高帕斯(Scopus)

摘要

The fracture toughness of fine‐grained undoped ZrO2‐toughened Al2O3 (ZTA) was essentially unchanged by postsintering hot isostatic pressing and increased monotonically with ZrO2 additions up to 25 wt%. The strength of ZTA with 5 to 15 wt% tetragonal ZrO2, which depended monotonically on the amount of ZrO2 present before hot isostatic pressing, was increased by pressing but became almost constant between 5 and 15 wt% ZrO2 addition. The strength appeared to be controlled by pores before pressing and by surface flaws after pressing; the size of flaws after pressing increased with ZrO2 content. The strength of ZTA containing mostly monoclinic ZrO2 (20 to 25 wt%) remained almost constant despite the noticeable density increase upon hot isostatic pressing because the strength was controlled by preexisting microcracks whose extent did not change on postsintering pressing. These strength‐toughness relations in sintered and isostatically hot‐pressed ZTA are explained on the basis of R‐curve behavior. The importance of the contribution of microcracks to the toughness of ZTA is emphasized.

原文English
頁(從 - 到)169-172
頁數4
期刊Journal of the American Ceramic Society
69
發行號3
DOIs
出版狀態Published - 1986 三月

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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