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Y2O3 and Nd2O3 co-stabilized ZrO2-WC composites

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Abstract

Y2O3 + Nd2O3 co-stabilized ZrO2-based composites with 40 vol% WC were fully densified by pulsed electric current sintering (PECS) at 1350 °C and 1450 °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 °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.m0.5 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 °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 (~9 MPa.m0.5) than their 2Y stabilized equivalents (~7 MPa.m0.5).

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Acknowledgements

S. Salehi thanks the Research Council of K.U.Leuven for a doctoral scholarship (DB/07/012). This work was supported by the Commission of the European Communities within the 6th Framework Program under project No. STRP 505541–1.

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Authors and Affiliations

  1. Department of Metallurgy and Materials Engineering, K.U.Leuven, Kasteelpark Arenberg 44, 3001, Leuven, Belgium

    Sedigheh Salehi, Omer Van der Biest & Jef Vleugels

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  1. Sedigheh Salehi
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  2. Omer Van der Biest
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  3. Jef Vleugels
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Correspondence to Jef Vleugels.

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Salehi, S., Van der Biest, O. & Vleugels, J. Y2O3 and Nd2O3 co-stabilized ZrO2-WC composites. J Mater Sci 43, 5784–5789 (2008). https://doi.org/10.1007/s10853-008-2899-0

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  • DOI: https://doi.org/10.1007/s10853-008-2899-0

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