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Carbide-oxide composites made from nanoscaled tungsten carbide, alumina and zirconia powders

: Pötschke, Johannes; Berger, Christian; Vornberger, Anne

Goto, R. ; Metal Powder Industries Federation -MPIF-, Princeton/N.J.:
Advances in powder metallurgy & particulate materials 2017. Vol.2: Parts 6-13 : Proceedings of the 2017 International Conference on Powder Metallurgy & Particulate Materials, sponsored by the Metal Powder Industries Federation, June 13-16, 2017, Las Vegas, Nevada
Princeton: MPIF, 2017
ISBN: 978-1-943694-15-0
International Conference on Powder Metallurgy and Particulate Materials (PowderMet) <2017, Las Vegas/Nev.>
Conference Paper
Fraunhofer IKTS ()

Cemented carbides are traditionally composites of WC and Co. For applications where a very high hardness is needed grades with a very low Co content or even Co free, so called binderless hardmetals are used. Price and high density of WC are motives for the idea of a partial substitution of WC and/or Co with oxides such as Al2O3 or ZrO2. Furthermore, the low sintering temperature of these oxides and their nontoxic behavior are interesting for lowering production costs as well as reducing health risks. Within this study different composites of WC with Al2O3 and ZrO2 were produced by conventional press and sinter techniques. The results show a strong influence of oxide content on hardness as well as promising mechanical properties such as a maximum hardness of 2430 HV10 and a maximum fracture toughness of 7.3 MPam1/2 for a composite of WC with 16 vol% Al2O3. Possible applications include wear parts (e.g. water jet nozzles) or cutting tools (e.g. for wood).