1. Preparation of zirconium-based ceramic and composite fine-grained powders
- Author
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Ryu, Hong Youl, Nersisyan, H.H., and Lee, Jong Hyeon
- Subjects
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ZIRCONIUM , *CERAMIC magnets , *METALLIC composites , *POWDER metallurgy , *SELF-propagating high-temperature synthesis , *MIXTURES , *PARTICLE size distribution , *TEMPERATURE effect , *CARBIDES - Abstract
Abstract: Zirconium-based ceramics and composites such as ZrC, ZrB2, ZrC–SiC, ZrB2–SiC–ZrC, and ZrB2–SiC–ZrC–ZrSi were synthesized in fine powder form via combustion synthesis (CS) using ZrSiO4, Mg, C, B, and NaCl as raw materials. Temperature distributions in the combustion wave were measured by thermocouples and used to estimate the combustion temperature and wave propagation velocity. The influence of the NaCl mole fraction on the combustion parameters, phase composition, and particle size of the composite powders was investigated. The experimental results revealed that the combustion temperature and particle size of the composites have a stable decreasing tendency with increase in the NaCl mole fraction in the starting mixture. It was found that near the combustion limit (1.5mol NaCl), the combustion temperature drops below 1500°C and the particle size reaches the nanometer scale. [Copyright &y& Elsevier]
- Published
- 2012
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