以硝酸铝和正硅酸乙酯为主要原料制备稳定莫来石溶胶,用浸渍包膜的工艺方法对钛酸铝(Al2TiO5,AT) 粉体进行包裹,研究了溶胶性能及含量对钛酸铝粉体包裹效果及性能改善的影响.结果表明: 溶胶的浓度为0.18～0.30 mol/L、黏度在56～93 mPa·s之间、 pH=3.0、包膜厚为0.15～0.20 μm时,可得到包裹效果良好的莫来石钛酸铝粉体,制备出性能优良的莫来石-钛酸铝复合材料.复合材料的抗折强度为36～50 Mpa,为钛酸铝材料强度的10～15倍,复合材料的热膨胀系数为1.89～2.25×10-6/℃(室温至1000 ℃),复合材料中的钛酸铝在1100 ℃/300 h的热处理未发生分解.应用TG-DSC、XRD、SEM、EPMA等对包膜前后莫来石粉体和复合材料粉体的热学行为、形貌和成分进行研究,探讨了性能与结构之间的关系.
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