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Title: Y2O3 and Nd2O3 co-stabilized ZrO2-WC composites
Authors: Salehi, Sedigheh ×
Van der Biest, Omer
Vleugels, Jozef #
Issue Date: Sep-2008
Publisher: Springer
Series Title: Journal of materials science vol:43 issue:17 pages:5784-5789
Abstract: Y2O3 + Nd2O3 co-stabilized ZrO2-based composites with 40 vol% WC were fully densified by pulsed electric current sintering (PECS) at 1350 degrees C and 1450 degrees C. The influence of the PECS temperature and Nd2O3 co-stabilizer content on the densification, hardness, fracture toughness and bending strength of the composites was investigated. The best combination of properties was obtained for a 1 mol% Y2O3 and 0.75 mol% Nd2O3 co-stabilized composite densified for 2 min at 1450 degrees C under a pressure of 62 MPa, resulting in a hardness of 15.5 +/- 0.2 GPa, an excellent toughness of 9.6 +/- 0.4 MPa.m(0.5) and an impressive 3-point bending strength of 2.04 +/- 0.08 GPa. The hydrothermal stability of the 1 mol% Y2O3 + 1 mol% Nd2O3 co-stabilized ZrO2-WC (60/40) composites was compared with that of the equivalent 2 mol% Y2O3 stabilized ceramic. The double stabilized composite did not degrade in 1.5 MPa steam at 200 degrees C after 4000 min, whereas the yttria stabilized composite degraded after less than 2000 min. Moreover, the (1Y,1Nd) ZrO2-WC composites have a substantially higher toughness (similar to 9 MPa.m(0.5)) than their 2Y stabilized equivalents (similar to 7 MPa.m(0.5)).
ISSN: 0022-2461
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
Metallurgy and Materials Engineering - miscellaneous
× corresponding author
# (joint) last author

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