Synthesis and Characterization of Hafnium Carbide Based Ceramics

Hafnium carbide powder was synthesized by sol-gel polycondensation of hafnium chloride with citric acid. The starting materials were dissolved in water and mixed homogeneously on a hot plate until a precomposite gel was formed. Pyrolysis of the obtained gel resulted in formation of monoclinic hafnia...

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Bibliographic Details
Published in:Key engineering materials 2014-01, Vol.616, p.1-7
Main Authors: Pantić, Jelena, Maksimović, Vesna, Yano, Toyohiko, Matovic, Branko, Nenadović, Snežana, Gautam, Devendraprakash, Bučevac, Dušan
Format: Article
Language:English
Subjects:
Carbon
Ceramics
Chlorides
Dissolution
Hafnium
Hafnium carbide
Sol gel process
Spark plasma sintering
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Summary:Hafnium carbide powder was synthesized by sol-gel polycondensation of hafnium chloride with citric acid. The starting materials were dissolved in water and mixed homogeneously on a hot plate until a precomposite gel was formed. Pyrolysis of the obtained gel resulted in formation of monoclinic hafnia and amorphous carbon, which after subsequent heat treatment transformed into hafnium carbide. Materials were analyzed by means of X-ray diffraction and electron microscopy investigations. The results showed that the obtained carbide powder was composed of nearly equiaxed particles of narrow size distribution. The obtained hafnium carbide powder was densified via spark plasma sintering (SPS) at 1950 oC using molybdenun silicide as sintering additive. Microstructure and mechanical properties of the obtained hafnium carbide ceramics were investigated.
ISSN:1013-9826
1662-9795
1662-9795
DOI:10.4028/www.scientific.net/KEM.616.1