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Effects of seeding on phase transformation and mechanical properties in complex-alkoxide-derived cordierite gel powder

Published online by Cambridge University Press:  31 January 2011

Masahiko Okuyama ,
Toshimi Fukui  and
Chihiro Sakurai
Masahiko Okuyama*
Affiliation:
Colloid Research Institute, Kitakyushu 805 Japan
Toshimi Fukui*
Affiliation:
Colloid Research Institute, Kitakyushu 805 Japan
Chihiro Sakurai*
Affiliation:
Colloid Research Institute, Kitakyushu 805 Japan
*
a)Now with NGK Spark Plug Co., Ltd., Komaki, Aichi, Japan.
b)Now with Kurosaki-Refractories Co., Ltd., Kitakyushu, Japan.
c)Now with Nippon Steel Corporation, Kawasaki, Japan.
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Abstract

Cordierite gel powder prepared by the hydrolysis of an alkoxide complex was seeded with crystalline α-cordierite particles. The effects of seeding on the phase transformation and mechanical properties were studied. The unseeded cordierite gel powder crystallized into α-cordierite via μ-cordierite at 1050 °C. The μ-α cordierite transformation caused microcracks which led to poor flexural strengths of about 30 MPa, although the strength of μ-cordierite was 160 MPa. The seeding appeared to promote a direct formation of the α-cordierite from the amorphous state. The development of microcracks due to μ-α cordierite transformation could be prevented by the modified crystallization behavior, resulting in the improved flexural strength of α-cordierite of 190 MPa. The seeding also lowered the crystallization temperature of α-cordierite to 900 °C, which could be attributed to the epitaxial crystallization of the complex-alkoxide-derived cordierite gel powder.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 8 , August 1992 , pp. 2281 - 2287
Copyright
Copyright © Materials Research Society 1992

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