为了研究ZrO_2含量对SiO_2-Al_2O_3-MgO-F-ZrO_2系微晶玻璃析晶特征的影响,采用传统的熔融-冷淬法制备了不同ZrO_2含量的玻璃试样.结果表明:在所研究的玻璃中,ZrO_2的最大溶解量在5.0%(质量分数,下同)左右,超过其饱和溶解度后将析出氧化锆相.玻璃样品在700 ℃处理发生非晶态的分相现象,分相区主要是氟元素的偏聚,而没有形成锆元素的偏聚.在不同氧化锆含量的玻璃中析出的晶体有氟云母和少量ZrO_2与莫来石相.ZrO_2加入量的提高有助于在低温下析晶,但ZrO_2含量的提高抑制了氟云母晶体的析出.随着玻璃中ZrO_2含量的提高,析出晶体从玫瑰花形向团簇状转变.
To explore the effects of the additions of ZrO_2 on the crystallization in SiO_2-Al_2O_3-MgO-F-ZrO_2 glass, the base glasses with various ZrO 2 contents were prepared by melt-quenching methods. The results indicate that the maximum solid solution of ZrO_2 in the studied glass is around 5.0 wt%, above which the crystalline phase of zirconia[ZrO_2]will be precipitated. The phase-separation is observed in the glass thermal treated at 700 ℃, in which the accumulation of fluorine element instead of zirconium element is formed. It is found that the crystalline phases of fluormica as the major phase and zirconia and mullite as a minor phase are formed in the glass with different ZrO_2 additives. The increase of ZrO_2 contents is favor to decrease the crystallization temperature, but to inhibit the precipitation of fluormica. The morphology of fluormica crystals changes from "rose" shape to cluster shape.
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