Recycling of Cristobalite Powder in Casting Mould

查看全文 作　　者：ZENG [1]Qun;SHEN [2]Keya;ZHOU [1]Yongheng 机构地区：[1]Laboratory of Nanophotonic Functional Materials and Devices,South China Normal University;[2]Jewelry Institute of Guangzhou Panyu Polytechnic 出　　处：《矿物学报》索引2013年第33卷第S1期,共1页 摘　　要：Cristobalite SiO2 can be obtained from the fused silica ceramic waste of ploysilicon plant, due to the phase conversion of fused silica to cristobalite during the process of polysilicon ingot. Cristobalite powder materials with high purity are manufactured by milling the discarded waste above. Thermal expansion rate of the cristobalite and gypsum bonding moulds were studied, which show that the thermal expansion of the cristobalite phase transition could effectively compensate for the shrinkage of the gypsum at the temperature between 200 ℃ and 400 ℃. Casting experiments with copper alloy show that the cristobalite can improve the thermal performance of moulds for precise casting of jewelry. 关 键 词：CASTING MOULD RECYCLING of CRISTOBALITE POWDER FUSED silica