Cristobalite SiO2 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.
Refractories and Industrial Ceramics – Springer Journals
Published: Apr 8, 2014
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