Synthesis of Ultra-fine ZrB2-ZrC Composite Powders by Inorganic Sol-gel Method

doi:10.3724/SP.J.1077.2008.00815

Abstract

Abstract: Based on the basic principle of carbothermal reduction reactions in the ZrO₂-B₂O₃-C system, ultra-fine ZrB₂-ZrC composite powders were synthesized by sol-gel method using zirconium oxychloride, boric acid and phenolic resin as sources of zirconia, boron oxide and carbon, respectively. Thermodynamic change process, phase compositions, crystallite size and morphology of the synthesized powders were characterized by thermogravimetry-differential thermal analysis, X-ray diffraction and scanning electron microscope. The results show that ZrB₂and ZrC phases form at 1300℃. The carbothermal reduction reactions are completely finished when calcined at 1500℃ for 1h. The average crystallite size and specific surface area are about 200nm and 87m²/g, respectively. The agglomeration phenomenon is improved by adding 1.0wt% polyethylene glycol.

Key words: sol-gel method, zirconium carbide, zirconium diboride

CLC Number:

TB335

YAN Yong-Jie,ZHANG Hui,HUANG Zheng-Ren,LIU Xue-Jian,DONG Shao-Ming. Synthesis of Ultra-fine ZrB₂-ZrC Composite Powders by Inorganic Sol-gel Method[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00815.

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Synthesis of Ultra-fine ZrB₂-ZrC Composite Powders by Inorganic Sol-gel Method

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