Germanium-Modified Cordierite Ceramics with Low Thermal Expansion

In order to synthesize cordierite ceramics with low thermal expansion coefficient and good properties, in our work, the cordierite ceramics were prepared by using talc, natural containing zirconium kyanite, common kyanite and industrial Al2O3 as raw materials, introducing the right amount of WO3 (introducing tungsten acid) as catalyst. The effects of the introduced WO3 on the phase composition, sintering characters, microstructure and thermal expansion coefficient of the cordierite ceramics were investigated. The results show that the introduction of WO3 can eliminate the intermediate phase magnesia-alumina spinel and promote the formation of cordierite; the as-prepared cordierite ceramics synthesized by using natural containing zirconium kyanite as raw materials have high densification degree and low thermal expansion coefficient (1.53×10-6/°C, Rt~1000 °C).

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Microstructures of La-Doped Low Thermal Expansion Cordierite Ceramics

Mechanical Properties and Performance of Engineering Ceramics and Composites VII - Ceramic Engineering and Science Proceedings ◽

10.1002/9781118217467.ch15 ◽

2012 ◽

pp. 153-162 ◽

Cited By ~ 1

Author(s):

Hiroto Unno ◽

Shoichi Toh ◽

Jun Sugawara ◽

Kensaku Hattori ◽

Seiichiro Uehara ◽

...

Keyword(s):

Thermal Expansion ◽

Low Thermal Expansion ◽

Cordierite Ceramics ◽

La Doped

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Low temperature sintering of α-cordierite ceramics with low thermal expansion using Li2O–Bi2O3 as a sintering additive

Journal of the Ceramic Society of Japan ◽

10.2109/jcersj2.119.706 ◽

2011 ◽

Vol 119 (1393) ◽

pp. 706-709 ◽

Cited By ~ 5

Author(s):

Toshio OGIWARA ◽

Yoshimasa NODA ◽

Kazuo SHOJI ◽

Osamu KIMURA

Keyword(s):

Thermal Expansion ◽

Low Temperature ◽

Low Temperature Sintering ◽

Sintering Additive ◽

Low Thermal Expansion ◽

Cordierite Ceramics

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Synthesis of Cordierite with Low Thermal Expansion Coefficient

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.105-106.802 ◽

2010 ◽

Vol 105-106 ◽

pp. 802-804 ◽

Cited By ~ 3

Author(s):

Kai Zhu ◽

Dao Yuan Yang ◽

Juan Wu ◽

Rui Zhang

Keyword(s):

Thermal Expansion ◽

Thermal Expansion Coefficient ◽

Expansion Coefficient ◽

Thermal Shock Resistance ◽

Sintering Temperature ◽

Low Thermal Expansion ◽

Optimum Chemical Composition ◽

Shock Resistance ◽

Cordierite Ceramics ◽

Optimum Chemical

Cordierite is an excellent material with good thermal shock resistance and used at high temperature for its low thermal expansion coefficient. Cordierite ceramics were prepared by using talc, alumina and kaolin clay as starting materials. The thermal expansion coefficient, phase composition and microstructure were studied and the results showed that: in order to get samples with low thermal expansion coefficient, the optimum chemical composition was a little rich in Al2O3 compared with the theoretical composition, the optimum sintering temperature was 1350°C, and adding 10% starch as pore-forming agent could effectively decreased the thermal expansion coefficient of the samples even to 0.8×10-6/°C. The samples contained majority of cordierite phase, with trace mullite and glass, the acicular cordierite crystals in samples developed very well and there were 10% starch powder used as pore-forming agent in formula. All these were the reasons to decrease the thermal expansion coefficient of cordierite material.

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