Fabrication of non-oxide ceramic powders by carbothermal-reduction from industrial minerals

The most promising method for obtaining a large variety of non-oxide products having important technical uses is carbothermal-reduction reaction (CRR). By using this procedure, SiC and ZrC/SiC powders are obtained from diatomaceous earth and zircon powder. In this way the synthesized powders are obt...

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Bibliographic Details
Published in:Ceramics international 2016-05, Vol.42 (7), p.8128-8135
Main Authors: Kljajević, Ljiljana, Šaponjić, Aleksandra, Ilić, Svetlana, Nenadović, Snežana, Kokunešoski, Maja, Egelja, Adela, Devečerski, Aleksandar
Format: Article
Language:English
Subjects:
B. Composites
CRR-method
D. Carbides
E. Structural applications
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Summary:The most promising method for obtaining a large variety of non-oxide products having important technical uses is carbothermal-reduction reaction (CRR). By using this procedure, SiC and ZrC/SiC powders are obtained from diatomaceous earth and zircon powder. In this way the synthesized powders are obtained at a relatively low temperature due to good homogenization. Starting C/ZrSiO4 admixtures having different molar ratios (3:1, 4:1, 5:1 and 7:1) and C/SiO2 having ratios 1:1, 3:1, 4:1, and 7:1 were heated at temperatures between 1300 and 1600°C in a controlled Ar flow atmosphere. The phase evolution was a function of the raw materials molar ratios and sintering temperature. The optimal parameters for the synthesis of SiC and ZrC/SiC powders were obtained. The results obtained by EDS analysis are in good agreement with those obtained by XRD analysis for the synthesized carbide powders.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2016.02.017