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|Title:||Preparation and characterization of cordierite powders by water-based sol-gel method|
|Keywords:||Water-based sol-gel method;Cordierite;Crystallizing process;Dielectric properties;Thermal expansion coefficient|
|Abstract:||Cordierite gel is synthesized by water-based sol-gel route, starting from basic magnesium carbonate and Al(NO3)3 inorganic solution dissolved in silica-ethanol sol. Crystallizing process of xerogels is confirmed by TG-DSC and X-ray diffraction. The μ-cordierite is formed firstly, then small amount of β-SiO2 and Mg-Al spinel are identified, at the same time the sapphirine is formed through the chemical reactions from β-SiO2 and Mg-Al spinel, and finally transformed to α-cordierite entirely. The obtained powders are analyzed by SEM and granularity analysis. The results show that more pure, fine and uniformly dispersed cordierite powders can be manufactured by water-based sol-gel method. The cordierite ceramics shown low dielectric constant (ε<5), low dielectric loss (tanδ<0.004) and low thermal expansion coefficient (α<1.85×10-6/oC).|
|ISSN:||0975-1017 (Online); 0971-4588 (Print)|
|Appears in Collections:||IJEMS Vol.18(3) [June 2011]|
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