高铝硅酸盐玻璃澄清过程高温观测及澄清剂的研究

发布时间：2018-04-10 14:53

  本文选题：高铝硅酸盐玻璃 + 澄清剂　； 参考：《海南大学》2017年硕士论文

【摘要】：气泡作为玻璃熔制过程中最常见的缺陷之一,极大程度影响着玻璃制品的外观、透明度、机械强度、光学均匀性等,为了消除玻璃中的气泡,添加合适的澄清剂是澄清过程中重要的一环。近年来,随着玻璃品种和性能的改进以及对环保的要求越来越严格,部分传统的玻璃澄清剂已无法满足要求,新型无毒环保、澄清效果更好的复合澄清剂成为当前的研究热点之一。目前,随着触摸屏电子设备的广泛使用,覆盖其表面的盖板玻璃成为热门的方向。高铝硅酸盐玻璃因其诸多优良性能成为盖板玻璃的首选材料。同时,高铝硅酸盐玻璃也因熔点高、粘度大、表面张力大等性质,给其高质量的生产带来很大的困难,尤其是高铝硅酸盐玻璃的澄清中气泡难以排除的问题一直困扰着很多玻璃生产厂家。本文中针对高铝硅酸盐玻璃,借助CelSian高温观测系,并使用差热-热重(DSC-TG)分析法,探索了不加澄清剂、加入各种单一澄清剂和二元复合澄清剂对玻璃熔体中气泡的产生、长大和排除过程的影响,分析了熔化澄清过程气泡的变化情况。主要研究结果如下:(1)使用差热-热重(DSC-TG)分析法,可知本文中配合料的玻璃化转变发生在861.3℃。在855.9-876.3℃之间,碳酸盐和二氧化硅发生反应吸收大量的热;温度继续升高,剩余的二氧化硅溶解,并在硅酸盐中扩散的过程释放大量的热。(2)对于高铝硅酸盐玻璃而言,在添加不同的种类和用量的单一澄清剂时,澄清效果最好的是0.5wt%的SrO2;在添加不同的种类和用量的二元复合澄清剂时,澄清效果最好的是0.4wt%的SnO2+0.60wt%的Na2SO4。(3)借助CelSian高温观测系统,完整地观察到了高铝硅酸盐玻璃熔化澄清过程配合料的变化情况及各种澄清剂的作用温度。同时可利用系统自带的软件辅助计算出气泡的平均逸出速率、玻璃液对气泡的吸收率。综合各组数据可知,添加SnO2+Na2SO4复合澄清剂,由于两者作用温度的相差较大,可在澄清的不同阶段释放气体,使气泡的逸出加快,可达到梯度澄清的效果。(4)通过CelSian高温观测系统,统计不同直径范围内的气泡数随温度分布的变化可知:在澄清剂未开始作用的阶段,直径在0.3-0.9mm范围内的气泡数往往占到气泡总数的70%-80%。一旦澄清剂开始反应,气泡总数迅速上升并在l0min后到达峰值。直径大于0.9mm的气泡数大幅上升,气泡的逸出明显加快。
[Abstract]:As one of the most common defects in glass melting process, bubble greatly affects the appearance, transparency, mechanical strength and optical uniformity of glass products.The addition of appropriate clarifier is an important part of the clarification process.In recent years, with the improvement of glass varieties and properties and the stricter requirements for environmental protection, some of the traditional glass clarifiers have been unable to meet the requirements, and a new type of non-toxic environmental protection,The compound clarifier with better clarification effect has become one of the research hotspots at present.At present, with the wide use of touch-screen electronic devices, the cover glass covering its surface has become a hot direction.High-alumina silicate glass has become the preferred material for cover glass because of its many excellent properties.At the same time, because of its high melting point, high viscosity and high surface tension, high alumina silicate glass has brought great difficulties to its high quality production.In particular, the clarification of high-alumina silicate glass bubble is difficult to eliminate the problem has been puzzling many glass manufacturers.In this paper, with the help of CelSian high temperature observation system and differential thermogravimetric DSC-TG analysis method, the bubble generation in glass melt was investigated by adding all kinds of single clarifier and binary compound clarifier without clarifier, by means of CelSian high temperature observation system and DSC-TG analysis method.The effect of growth and exclusion process on the bubble changes in the process of melting clarification was analyzed.The main results are as follows: (1) the differential thermogravimetric (DSC-TG) method is used to determine the glass transition of the mixture at 861.3 鈩，

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