Title: Electrically conductive ZrO2-TiN composites
Authors: Salehi, Sedigheh ×
Van der Biest, Omer
Vleugels, Jef #
Issue Date: 2006
Publisher: Elsevier Science Publishers
Series Title: Journal of the European Ceramic Society vol:26 issue:15 pages:3173-3179
Abstract: 1.75 mol% Y2O3-stabilized ZrO2-TiN composites could be fully densified by hot pressing for 1 h at 1550 degrees C in vacuum under a mechanical pressure of 28 MPa. Composites with 35-95 vol% TiN were investigated and the best mechanical properties, i.e., a Vickers hardness of 14.7 GPa, an indentation toughness of 5.9 MPa m(1/2) and an excellent bending strength of 1674 MPa were obtained with 40 vol% TiN. The active toughening mechanisms were identified and their contribution to the overall composite toughness as function of the TiN content was modelled, experimentally verified and discussed. Transformation toughening was found to be the primary toughening mechanism. The TiN grain size was found to increase with increasing TiN content, resulting in a decreasing hardness and strength. A maximum strength was obtained at 40 vol% TiN. The electrical resistivity of the composites decreases exponentially with increasing TiN content and correlates well with the Polder-Van Santen mixture rule. Thus at around 40 vol% TiN, the conductivity is high enough to allow EDM machining of the composite, therefore avoiding the expensive grinding operation for final shaping and surface finishing of components. (c) 2005 Elsevier Ltd. All rights reserved.
ISSN: 0955-2219
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
Department of Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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