Title: Mechanical properties of Y2O3/Al2O3-coated Y-TZP ceramics
Authors: Vleugels, Jef ×
Yuan, Z.X.
Van der Biest, Omer #
Issue Date: Jun-2002
Publisher: Elsevier Science Publishers
Series Title: Journal of the European Ceramic Society vol:22 issue:6 pages:873-881
Abstract: Y2O3/Al2O3-coated monoclinic ZrO2 nanopowder was prepared from a suspension of aluminiumnitrate, yttriumnitrate and ZrO2 powder in an alcohol/water mixture. The influence of the Y2O3 and Al2O3 content as well as the sintering temperature on the mechanical properties of the densified yttria-stabilised tetragonal zirconia polycrystal (Y-TZP) materials was investigated. Fully dense Y-TZP materials could be obtained from the Y2O3/Al2O3-coated starting powders by means of hot pressing in vacuum at 1450 degreesC. Typical HV10 hardness values of 1130 kg/mm(2) were obtained and the fracture toughness could be tailored up to 9 MPa m(1/2) by doping the 1.75-2.0 mol% Y2O3-coated ZrO2 starting powders with 2.0 wt. % of Al2O3. The properties and microstructures of the Y2O3/Al2O3-coated powder based ceramics are compared with those of conventional co-precipitated 2Y and 3Y-TZP ceramics, and the differences in fracture toughness are explained in terms of the differences in the grain size and Y2O3 distribution. (C) 2002 Elsevier Science Ltd. All rights reserved.
ISSN: 0955-2219
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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