Pressureless sintering of binderless tungsten carbide

The aim of this study was to produce dense, single phase polycrystals. The research was carried out on the submicron tungsten carbide powder without additives, with either a carbon or tungsten additive and on the powder with both additives. The primary task of carbon was to reduce surface oxide impu...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2017-12, Vol.37 (15), p.4567-4576
Main Authors: Kornaus, Kamil, Rączka, Marian, Gubernat, Agnieszka, Zientara, Dariusz
Format: Article
Language:English
Subjects:
Binderless
Microstructure
Pressureless sintering
Singlephase
Tungsten carbide
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Summary:The aim of this study was to produce dense, single phase polycrystals. The research was carried out on the submicron tungsten carbide powder without additives, with either a carbon or tungsten additive and on the powder with both additives. The primary task of carbon was to reduce surface oxide impurities which passivate WC grains; tungsten in turn bounds free carbon in the WC. The authors manufactured fine-grained, dense (96–98% T.D.) and single-phase WC polycrystals, using the technique of pressureless sintering at the temperature not exceeding 2000°C. A positive effect of carbon addition on tungsten carbide sinterability was observed, whereby a dense, fine-grained polycrystals can be obtained at 1900°C. It was also observed that a significant excess of temperature of sintering process resulted in a strong abnormal grain growth of WC grains.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2017.06.008