Multiphase composites of tetragonal zirconia agglomerate dispersed into alumina and alumina-zirconia matrices

Tadashi Endo, Naomichi Miyagawa, Hirotsugu Takizawa, Masahiko Shimada

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Multiphase composites of yttria- and ceria-doped tetragonal zirconia agglomerates (10-50 μm) dispersed into an alumina or alumina-zirconia matrix were sintered at 1500-1600 °C in air, followed by post-Hot Isostatic Pressing (HIP) at 1450°C and 150 MPa in an Ar gas atmosphere. The relative density of the recovered composites was above 98% of the theoretical density. By chemically etching on the surface of zirconia agglomerates, the sinterability of composites was apparently improved; and no microcracks nor pores were observed at the interface of agglomerate and matrix. According to scanning electron microscopy (SEM) observation, tetragonal and tetragonal-monoclinic zirconia agglomerates were highly dispersed into the alumina or alumina-zirconia matrix. The multiphase composites containing 10 vol% spherical agglomerates demonstrate the relatively low value of bending strength, < 400 MPa, and a high value of fracture toughness, > 11 MPa m1/2. The crack propagation introduced by Vickers indentation was efficiently suppressed and deflected by the agglomerates.

本文言語English
ページ(範囲)2395-2400
ページ数6
ジャーナルJournal of Materials Science
29
9
DOI
出版ステータスPublished - 1994 1月 1

ASJC Scopus subject areas

  • 材料科学(全般)
  • 材料力学
  • 機械工学

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