Synthesis and pyrolysis evolution of glucose-derived hydrothermal precursor for nanosized zirconium carbide

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• 作者：Wentao Xu^a ; Youfu Zhou^a ; ^{yfzhou@fjirsm.ac.cn" class="auth_mail" title="E-mail the corresponding author} ; Decai Huang^a ; Mingxue Yang^a ; ^b ; Cheng Yu^a ; ^b ; Kun Wang^a ; ^b ; Ming Xiang^a ; ^b ; Wei Pan^c
• 关键词：Precursor ; Hydrothermal reaction ; Nanoparticles ; Carbide ; SPS
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：July 2016
• 年：2016
• 卷：42
• 期：9
• 页码：10655-10663
• 全文大小：3965 K

文摘

Nanosized zirconium carbide (ZrC) was synthesized successfully by a novel hydrothermal precursor conversion method using chelation of polydentate glucose as the carbon source. During the pyrolysis, the core-matrix structure of intimate nanosized ZrO₂ and amorphous carbon mixture forms, resulting in short diffusion path and limit of grain growth. ZrC first appears at a much lower temperature of 1200 °C and completes conversion at 1400 °C in comparison with that of precursor without hydrothermal treatment. By raising the heating temperature to 1600 °C, oxygen content could be reduced (0.55 wt%) with a low residual carbon content (2.3 wt%), and the average size of the spherical crystallite increases from 100 nm to 200 nm. Based on above ZrC powders, the additive-free ceramic with 99.4% relative density by spark plasma sintering (SPS) at a low temperature of 1700 °C has been achieved.