以硝酸镁、硝酸铝和正硅酸乙酯为原料,按照堇青石化学计量配比,用溶胶-凝胶法配合回流制备堇青石粉体,通过差热分析、X射线衍射、扫描电镜等分析测试方法,对所制备粉体进行分析和表征.结果表明,在不添加任何助剂的情况下,可制得粒度均匀的堇青石粉体,平均粒径约为100 nm；压片后的坯样经1 056℃烧结,可获得以α-堇青石为主晶相的陶瓷材料,致密度为98.6％,且具有较低的介电常数和介电损耗(ε=3.94,tg δ=0.001 6,1 GHz),可用作高频片感介质材料.%With a stoichiometric cordierite composition, using etraethy-tlorthosilicate, Mg(NO3)2·6H2O and A1(NO3)3·9H2O as raw materials, the cordierite nano-particles were prepared by sol-gel technique. The products were analyzed and characterized by DSC, XRD and SEM. The results show that the cordierite particles are prepared without additives after sintered at 700 ℃ for 2 h which have an average diameter of about 100 nm. Dense cordierite ceramics can be fabricated with the sample being sintered at 1 056 ℃ for 4 h. The sintered sample possesses excellent dielectric properties (ε=3.94, tg δ=0.001 6, 1 GHz),which is an ideal dielectric material for high frequency multi-layer chip inductors and other electronic components.
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