MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
Fracture Toughness of Yttria-Stabilized Cubic Zirconia (8Y-CSZ) Doped with Pure Silica
Keijiro HiragaKoji MoritaByung-Nam KimYoshio Sakka
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2004 Volume 45 Issue 12 Pages 3324-3329

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Abstract

In yttria-stabilized cubic zirconia, the addition of 0.15—5 mass% pure silica introduces a glass phase dispersing uniformly along grainboundary facets and at multiple junctions. For a grain size of 0.75 or 1.7 μm, the dispersion of the glass phase decreases the elastic modulus, the Vickers hardness and the elastic modulus-to-hardness ratio, whereas it affects little in the value of fracture toughness measured by an indentation method. The latter result arises because the decrease in the elastic modulus-to-hardness ratio is compensated by a decrease in the crack length for a given indentation load. Inspection of crack-propagation paths indicates that the glass phase with sizes smaller than those of the matrix grains is not a site for easy crack-propagation, but provides a site for a crack-deflection mechanism.

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© 2004 The Japan Institute of Metals and Materials
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