ANNEALING EFFECT ON FRACTURE TOUGHNESS MEASUREMENT OF ZrO//2-TOUGHENED Al//2O//3 CERAMICS USING VICKERS INDENTATION.

Saburo Hori, Masahiro Yoshimura, Ryuichi Kurita, Hisatsugu Kaji, Shigeyuki Somiya

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Surface grinding and polishing ZrO//2 prime s tetragonal-to-monoclinic transformation resulted in residual compressive surface stress in the ZrO//2-toughened Al//2O//3 (ZTA) ceramics. When the surface stress was removed by annealing the specimens at 1350 degree C for 1 h, the fracture toughness (K//i//c) values determined by Vickers indentation technique were independent of the Vickers load. But with the as-polished specimens, the K//i//c appeared larger and strongly dependent on the Vickers load, because the surface stress impeded the crack extension.

Original languageEnglish
Pages (from-to)296-297
Number of pages2
JournalYogyo Kyokai Shi/Journal of the Ceramic Society of Japan
Volume92
Issue number5
Publication statusPublished - 1984 Dec 1

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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