Journal of Materials Science

, Volume 29, Issue 9, pp 2395–2400 | Cite as

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

  • Tadashi Endo
  • Naomichi Miyagawa
  • Hirotsugu Takizawa
  • Masahiko Shimada


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.


Polymer Alumina Atmosphere Electron Microscopy Scanning Electron Microscopy 
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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • Tadashi Endo
    • 1
  • Naomichi Miyagawa
    • 1
  • Hirotsugu Takizawa
    • 1
  • Masahiko Shimada
    • 1
  1. 1.Department of Molecular Chemistry and Engineering, Faculty of EngineeringTohoku UniversityMiyagiJapan

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