Abstract
The application of cordierite ceramics as the electronic materials has recently extended immensely, because of their superior heat resistance, low dielectric constants, etc. In this study, the cordierite ceramics, which can be sintered at low temperature without any nucleation agents, were prepared by the sol-gel method. The effect of Al/Si ratio on the crystallization behavior and sintering was investigated. Metal alkoxides, Si(OC2H5)4, Al(OC4H9s)3, and Mg (OC2H5)2 were hydrolyzed in 2-methoxyethanol, resulting in gelation. The obtained gel powders were heat-treated at various temperatures. As the Al/Si ratio decreased, the deposition of μ-cordierite occurred at lower temperatures. The initial transformation of α-cordierite phase from μ-cordierite phase took place by heat treating at 950°C for 1h. However, the complete transformation to single α-cordierite phase was retarded and achieved at higher temperatures, >1050°C. With the increase of Al/Si ratio, the initial transformation to α-cordierite from μ-cordierite occurred at higher temperatures, while the complete transformation took place rapidly at lower temperatures, about 1000°C.
| Original language | English |
|---|---|
| Pages (from-to) | 43-47 |
| Number of pages | 5 |
| Journal | Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan |
| Volume | 105 |
| Issue number | 1 |
| Publication status | Published - 1997 |
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Keywords
- Al/Si ratio
- Cordierite ceramics
- Crystallization behavior
- Iμ- and α-cordierite
- Sol-gel method
ASJC Scopus subject areas
- Ceramics and Composites
Cite this
Effect of Al/Si ratio on crystallization of cordierite ceramics prepared by the sol-gel method. / Oh, Jun Rok; Imai, Hiroaki; Hirashima, Hiroshi.
In: Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan, Vol. 105, No. 1, 1997, p. 43-47.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of Al/Si ratio on crystallization of cordierite ceramics prepared by the sol-gel method
AU - Oh, Jun Rok
AU - Imai, Hiroaki
AU - Hirashima, Hiroshi
PY - 1997
Y1 - 1997
N2 - The application of cordierite ceramics as the electronic materials has recently extended immensely, because of their superior heat resistance, low dielectric constants, etc. In this study, the cordierite ceramics, which can be sintered at low temperature without any nucleation agents, were prepared by the sol-gel method. The effect of Al/Si ratio on the crystallization behavior and sintering was investigated. Metal alkoxides, Si(OC2H5)4, Al(OC4H9s)3, and Mg (OC2H5)2 were hydrolyzed in 2-methoxyethanol, resulting in gelation. The obtained gel powders were heat-treated at various temperatures. As the Al/Si ratio decreased, the deposition of μ-cordierite occurred at lower temperatures. The initial transformation of α-cordierite phase from μ-cordierite phase took place by heat treating at 950°C for 1h. However, the complete transformation to single α-cordierite phase was retarded and achieved at higher temperatures, >1050°C. With the increase of Al/Si ratio, the initial transformation to α-cordierite from μ-cordierite occurred at higher temperatures, while the complete transformation took place rapidly at lower temperatures, about 1000°C.
AB - The application of cordierite ceramics as the electronic materials has recently extended immensely, because of their superior heat resistance, low dielectric constants, etc. In this study, the cordierite ceramics, which can be sintered at low temperature without any nucleation agents, were prepared by the sol-gel method. The effect of Al/Si ratio on the crystallization behavior and sintering was investigated. Metal alkoxides, Si(OC2H5)4, Al(OC4H9s)3, and Mg (OC2H5)2 were hydrolyzed in 2-methoxyethanol, resulting in gelation. The obtained gel powders were heat-treated at various temperatures. As the Al/Si ratio decreased, the deposition of μ-cordierite occurred at lower temperatures. The initial transformation of α-cordierite phase from μ-cordierite phase took place by heat treating at 950°C for 1h. However, the complete transformation to single α-cordierite phase was retarded and achieved at higher temperatures, >1050°C. With the increase of Al/Si ratio, the initial transformation to α-cordierite from μ-cordierite occurred at higher temperatures, while the complete transformation took place rapidly at lower temperatures, about 1000°C.
KW - Al/Si ratio
KW - Cordierite ceramics
KW - Crystallization behavior
KW - Iμ- and α-cordierite
KW - Sol-gel method
UR - http://www.scopus.com/inward/record.url?scp=0030829192&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0030829192&partnerID=8YFLogxK
M3 - Article
VL - 105
SP - 43
EP - 47
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
SN - 0914-5400
IS - 1
ER -