摘要
在CaO-Al2O3-SiO2系统中引入MgO、K2O、MnO和FeO等氧化物成为典型的矿渣微晶玻璃组成。当组成点落在该三元相图中亚稳不混溶区内时,玻璃很容易分相。分相以后,两相的化学组成均偏离原始玻璃组成,生成富硅相和另外一个富钙相。在这种情况下如果引入适当的硫化物、氟化物或者氧化物等晶核剂可以获得均匀的整体析晶。已对这一组成范围内的玻璃核化与晶化开展了大量的研究。但对化学组成远离上述三元亚稳不混溶区的玻璃尚缺乏深入的研究工作。选择合适的晶核剂使这类玻璃微晶化。
It is found that Ni2O3 is an available nucleating agent for the.5K2O-43CaO-12Al2O3-40SiO2 glass.Under reducing atmosphere,nickel mioroballoons were precipitated from the oversaturated glass melt or the homogeneous glass heated above Tg temperature.The nickel microballoons acted as preferential nucleating sites for kalsilite crystals when they were heated at 850℃ for 4h,and then the major crystal phasas,gehlenite and wollaslonite,crystallized The heterogeneous nucleation mechanism was investigated.
出处
《玻璃与搪瓷》
CAS
北大核心
1992年第5期11-15,10,共6页
Glass & Enamel
