摘要：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,tgδ=0.001 6,1 GHz),可用作高频片感介质材料。

关键词：溶胶-凝胶法；堇青石；纳米粉体

Abstract：With a stoichiometric cordierite composition,using etraethytlorthosilicate,Mg(NO₃)₂·6H₂O and Al(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.

Keywords：sol-gel technique；cordierite；nano-powders