| 碳化硼微粉的低温合成 |
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| 引用本文： | 张云霏,仲剑初,王洪志.碳化硼微粉的低温合成[J].无机盐工业,2011,43(10):29-32. |
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| 作者姓名： | 张云霏 仲剑初 王洪志 |
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| 作者单位： | 大连理工大学化工学院材料化工系,辽宁大连,116024 |
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| 摘 要： | 以聚乙烯醇和硼酸为原料,首先合成聚乙烯醇硼酸酯前驱物凝胶,然后将前驱物热解及碳热还原制备碳化硼粉末。考察了聚乙烯醇与硼酸的物质的量比,前驱物热解温度,碳热还原温度以及还原时间等因素对碳化硼合成的影响。采用IR、化学分析、XRD、离心粒度分析、SEM等方法对中间物及产物进行了表征,确定了中间物及产物的组成、物相、粒度分布及形貌。研究结果表明:前驱物合成的适宜原料配比是n(聚乙烯醇)∶n(硼酸)=4∶1;前驱物在600℃下热解2 h,在1 300℃下碳热还原2 h,得到粒径为10μm左右的碳化硼微粉。
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| 关 键 词： | 碳化硼 聚乙烯醇 溶胶-凝胶法 |
Low temperature synthesis of boron carbide micropowder |
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| Zhang Yunfei,Zhong Jianchu,Wang Hongzhi.Low temperature synthesis of boron carbide micropowder[J].Inorganic Chemicals Industry,2011,43(10):29-32. |
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| Authors: | Zhang Yunfei Zhong Jianchu Wang Hongzhi |
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| Affiliation: | Zhang Yunfei,Zhong Jianchu,Wang Hongzhi (Department of Materials Science and Chemical Engineering,School of Chemical Engineering,Dalian University of Technolgy,Dalian 116024,China) |
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| Abstract: | Polyvinyl borate gel was prepared with polyvinyl alcohol(PVA) and boron acid as raw materials,which was employed as precursor for preparing boron carbide and then it was pyrolyzed and reduced to form boron carbide powder by carbonthermal process.Effects of amount-of-substance ratio of polyvinyl alcohol to boron acid,pyrolyzed temperature of the precursor,carbonthermal reduction temperature,and reduction time of pyrolyzed precursor on boron carbide synthesis were respectively investigated.Intermediate and pr... |
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| Keywords: | boron carbide polyvinyl alcohol sol-gel method |
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