Effects of nucleation agents on the preparation of transparent glass–ceramics
Effects of nucleation agents on the preparation of transparent glass–ceramics
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DOI：
10.1016/j.jeurceramsoc.2012.02.055
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发表时间：
2012-08
影响因子：
5.7
通讯作者：
M. Ghasemzadeh;A. Nemati;S. Baghshahi
中科院分区：
文献类型：
--
作者：
M. Ghasemzadeh;A. Nemati;S. Baghshahi
Formation of transparent glass–ceramic in the system MgO–SiO2–Al2O3–K2O–B2O3–F with and without addition of LiF and NaF has been investigated. Crystallization of glass-sample was conducted by controlled thermal heat-treatment, at determined nucleation and crystallization temperatures. In this regard, the effects of addition of LiF and NaF were investigated on the crystallization behavior and transparency of the samples. Low transmission (less than 80% at 600nm) was observed in the basic composition (K). The addition of NaF and LiF caused more intense phase separation in the system. The results indicated that the glass–ceramic can remain transparent if fine grains with nano size are precipitated but will turn into opaque when large grains appear, because of the difference in the refractive index between glass and precipitated crystals.
