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溶膠-凝膠法制備HfB2粉體及其氧化行為
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國家自然科學基金（51072166）


HfB2 Prepared by Sol-Gel Method and Its Oxidation Behavior
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    摘要:

    以HfCl4、H3BO3、酚醛樹脂為原料，通過溶膠-凝膠結合碳熱還原法成功制備了HfB2粉體。分別采用XRD和SEM對高溫處理后的粉體相組成和微觀形貌進行了分析；采用TGA研究了粉體的高溫氧化行為。結果表明：處理溫度及硼酸濃度的不同會導致產(chǎn)物純度、顆粒大小的不同，而且高溫氧化性能也有所不同。當處理溫度為1800 ℃且硼酸含量高于生成硼化鉿化學計量比時，產(chǎn)物的純度較高，顆粒均勻，高溫氧化性能較好。對溶膠凝膠結合碳熱還原法制備HfB2粉體的反應機制進行了探討

    Abstract:

    HfB2 powders were prepared successfully by combining sol-gel with carbonthermal reduction. The phase components and micro-structure were analyzed by XRD and SEM, respectively. The oxidation behavior of the powders at high temperature was measured by TGA. The results show that reduction temperature and content of boric acid have obvious effects on the purity, the average size and the oxidation behavior of HfB2. As the temperature is 1800 ℃ and the content of boric acid is higher than its stoichiometric ratio of the synthesizing of HfB2, the obtained HfB2 with high purity and uniform particle size has the better oxidation behavior. Moreover, the reactive mechanism of preparing HfB2 powders was also discussed

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姚棟嘉,李賀軍,劉 磊,付前剛,李克智,陶 珺.溶膠-凝膠法制備HfB2粉體及其氧化行為[J].稀有金屬材料與工程,2013,42(12):2594~2597.[Yao Dongjia, Li Hejun, Liu Lei, Fu Qiangang, Li Kezhi, Tao Jun. HfB2 Prepared by Sol-Gel Method and Its Oxidation Behavior[J]. Rare Metal Materials and Engineering,2013,42(12):2594~2597.]
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  • 收稿日期:2012-12-14
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