Abstract
Ultra-fine ZrB2 powders were synthesized by sol-gel carbothermal processing using zirconium oxychloride (ZrOCl2.8H2O), boric acid (H3BO3) and sucrose (C12H22O11) as raw materials. Additionally, mannitol was used as cosolvent to obtain a stable high-concentration ZrB2 sol. Since C12H22O11 can be completely decomposed to carbon, carbon might be accounted precisely for the carbothermal reduction reaction. In the case of C/Zr(mol.)=6.0 and B/Zr(mol.)=3.0, a single phase ZrB2 without residual ZrO2 or ZrC was obtained. The photomicrograph revealed a spheres shape morphology with an uniform size distribution.
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