Thermal Characteristics of Fused Silica Ceramic Waste and its Application in Casting Jewelry

Cristobalite SiO 2 can be obtained from fused silica ceramic wastes formed at factories that make polycrystalline silicon, where fused silica is converted to cristobalite during the production of polycrystalline ingots. High-purity cristobalite powder is obtained by grinding these wastes. A study wa...

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Bibliographic Details
Published in:Refractories and industrial ceramics 2014-03, Vol.54 (6), p.490-493
Main Authors: Zhou, Yongheng, Shen, Keya, Zeng, Qun
Format: Article
Language:English
Subjects:
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composites
Copper alloys
Cristobalite
Fused silica
Glass
Ingot casting
Jewelry
Materials Science
Metal castings industry
Molds
Natural Materials
Powders
Silica
Thermal expansion
Wastes
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Summary:Cristobalite SiO 2 can be obtained from fused silica ceramic wastes formed at factories that make polycrystalline silicon, where fused silica is converted to cristobalite during the production of polycrystalline ingots. High-purity cristobalite powder is obtained by grinding these wastes. A study was made of the coefficient of linear thermal expansion of molds which are composed of cristobalite with a gypsum binder and are used to make jewelry. It was established that the thermal expansion which takes place during the transition to the cristobalite phase can effectively compensate for the shrinkage which the gypsum undergoes in the temperature range from 200 to 400°C. Experiments involving the casting of a copper alloy showed that the use of cristobalite can improve the thermal performance of molds employed in the production of jewelry.
ISSN:1083-4877
1573-9139
DOI:10.1007/s11148-014-9639-6