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

Tadashi Endo, Naomichi Miyagawa, Hirotsugu Takizawa, Masahiko Shimada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2395-2400
Number of pages6
JournalJournal of Materials Science
Volume29
Issue number9
DOIs
Publication statusPublished - 1994 Jan 1

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Multiphase composites of tetragonal zirconia agglomerate dispersed into alumina and alumina-zirconia matrices'. Together they form a unique fingerprint.

Cite this