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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.18 [2011] >
IJEMS Vol.18(3) [June 2011] >
| Title: | Preparation and characterization of cordierite powders by water-based sol-gel method |
| Authors: | Tang, Bin
Fang, YouWei
Zhang, ShuRen
Ning, HaiYan
Jing, ChunYu |
| Keywords: | Water-based sol-gel method
Cordierite
Crystallizing process
Dielectric properties
Thermal expansion coefficient |
| Issue Date: | Jun-2011 |
| Publisher: | NISCAIR-CSIR, India |
| 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). |
| Page(s): | 221-226 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.18(3) [June 2011]
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