Fabrication of Nanosized Tungsten Carbide Ceramics by Reactive Spark Plasma Sintering

Binderless tungsten carbide ceramics were produced by reactive spark plasma sintering, using tungsten nitride and carbon black as starting materials. The phase and microstructure evolution during the sintering process was investigated. It was found that the tungsten nitride decomposed into nano tung...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2011-10, Vol.94 (10), p.3230-3233
Main Authors: Sun, Shi-Kuan, Kan, Yan-Mei, Zhang, Guo-Jun
Format: Article
Language:English
Subjects:
Carbides
Carbon black
Ceramics
Microstructure
Nanomaterials
Nanostructure
Nitrides
Plasma sintering
Temperature
Tungsten
Tungsten carbide
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Summary:Binderless tungsten carbide ceramics were produced by reactive spark plasma sintering, using tungsten nitride and carbon black as starting materials. The phase and microstructure evolution during the sintering process was investigated. It was found that the tungsten nitride decomposed into nano tungsten with a particle size of about 25 nm firstly, and then reacted with carbon black to form carbides. Due to the high activity of the in situ formed carbides, samples could be densified at a temperature as low as 1350°C. The bulk carbides possessed an average grain size of 270 nm and Vickers’ hardness of 25.4 GPa.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2011.04813.x