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无机材料学报

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溶胶-凝胶法制备堇青石粉体的固相反应过程和烧结性的研究

谢志勇; 梁辉; 徐明霞; 徐廷献   

  1. 先进陶瓷及加工技术教育部重点实验室（天津大学） 天津 300072
  • 收稿日期:2003-06-17 修回日期:2003-10-21 出版日期:2004-07-20 网络出版日期:2004-07-20

Solid Phase Reaction Process of Cordierite Powders Prepared by Sol-Gel Method and Its Sintering

XIE Zhi-Yong; LIANG Hui; XU Ming-Xia; XU Ting-Xian   

  1. Key Laboratory of Advanced Ceramics and Machining Technology （Tianjin University）; Ministry of Education; Tianjin 300072; China
  • Received:2003-06-17 Revised:2003-10-21 Published:2004-07-20 Online:2004-07-20

PDF (PC)

1118

被引次数

29

摘要：

将TEOS,镁铝硝酸盐以及一定量的尿素溶于乙醇-水溶液。100℃水浴加热形成凝胶。凝胶干燥后,高温煅烧可得到一种镁铝硅复合氧化物粉体。对在不同温度下煅烧的粉体和1350℃烧结的样品进行X射线衍射分析,发现在煅烧过程中,基体形态经历了从无定形态向晶态α-堇青石的转化过程,并伴随有μ-堇青石相,镁铝尖晶石相和β-石英固溶体的出现和消失。1350℃烧结的样品全部为α-堇青石相,烧结致密度最高达99.5％。以扫描电镜观察该样品的表面形貌,可看出其晶粒呈薄片状。并对纯堇青石的致密化烧结过程进行了探讨。

关键词: 尿素, 溶胶-凝胶, 堇青石, 烧结

Abstract: The TEOS, stoichiometric magnesium nitrate and aluminum nitrate, and some carbamide were dissolved in the
solution of CH3CH2OH-H2O. The solution was heated at 100℃ and then transformed into gelatinate. The dried gelatinate calcined at high
temperature and a compound of MgO, Al2O3 and SiO2 could be obtained. The powder calcined at different temperatures and the sample sintered at
1350℃ for 2h were examined by using XRD. The X-Ray diffraction studies indicate that the forms of the matrix when heat-treated come through
a progress from amorphous compound to α-cordierite, with the appearance and disappearance of μ-cordierite, spinel and β-SiO2. The whole
sample sintered at 1350℃ is made of α-cordierite. The highest density of the samples is 99.5%. The SEM micrograph of the sample
shows that the grain is flake. The densification process of pure cordierite ceramics was investigated.

Key words: carbamide, sol-gel, cordierite, sintering

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