水在浮法玻璃成形过程中的变化及对渗锡的影响
发布时间：2019-07-08 17:36
【摘要】：采用全氧燃烧技术后,浮法玻璃含水量增加,渗锡量大、虹彩缺陷严重。为探究玻璃中的水在浮法成形过程中的变化规律及对渗锡的影响,本文采用FTIR研究了全氧燃烧浮法玻璃和空气燃烧浮法玻璃上表层、中间层和锡面层含水量的变化规律；用MAS-NMR对玻璃结构进行研究,同时对玻璃粘度、热膨胀系数、耐水性进行测试；通过控制熔化气氛条件制备含水量不同的玻璃,并通过浮法模拟装置进行成形,研究含水量与渗锡的相关性；研究H2含率、加铁量对渗锡的影响,初步探索H2催化剂对减少玻璃渗锡量的作用效果。通过各项表征手段和实验结果分析得出以下结论： 1、红外光谱分析结果表明：空气燃烧浮法玻璃含水量低于全氧燃烧浮法玻璃；在成形过程中空气燃烧浮法玻璃各层含水量变化不明显,而全氧燃烧浮法玻璃上表层含水量随锡槽H2含率和玻璃厚度的增加而减少,中间层含水量不发生变化,锡面层含水量仅随玻璃厚度增加而减少。 2、通过对全氧燃烧浮法玻璃和空气燃烧浮法玻璃结构和性能进行测试,结果发现前者网络结构中Q2、Q3结构单元所占比例增加、Q4结构单元比例减少；相同温度下高温粘度降低,热膨胀系数增大；EPMA测试发现全氧燃烧浮法玻璃中阳离子比较容易移动,玻璃渗锡深度更大。 3、熔制气氛水汽比越大,玻璃含水量越高,通过对不同含水量玻璃成形模拟实验结果分析发现：玻璃含水量越高,渗锡浓度随深度变化梯度越小,渗锡深度越大,锡离子扩散速率越快。 4、分别对全氧燃烧和空气燃烧气氛条件下熔制的基础玻璃进行模拟成形实验,通过比较发现H2含率在6-7%时,前者的渗锡量可以得到较好的控制；加铁可以抑制渗锡,但有最佳的阈值,实验中加铁占锡0.4%重量比时,渗锡量最少； 5、使用H2催化剂后,成形温度为105℃条件下玻璃的渗锡量较空白组下降约16%；在成形温度为900℃条件下,渗锡量下降不明显。
文内图片：
图片说明：烧与空气燃烧示意图
[Abstract]:After using peroxic combustion technology, the moisture content of float glass increases, the amount of tin infiltrates is large, and the rainbow defect is serious. In order to investigate the variation of water in glass during float forming and its influence on tin infiltration, the variation of water content in the upper layer, middle layer and tin layer of oxygen combustion float glass and air combustion float glass was studied by FTIR, and the glass structure was studied by MAS-NMR, and the viscosity, thermal expansion coefficient and water resistance of glass were tested at the same time. The glass with different water content was prepared by controlling the melting atmosphere, and the correlation between water content and tin infiltration was studied by float simulation device, and the effect of H2 content and iron content on tin infiltration was studied, and the effect of H2 catalyst on reducing the tin content of glass was preliminarily explored. Through the analysis of various characterization methods and experimental results, the following conclusions are drawn: 1. The results of infrared spectrum analysis show that the water content of air combustion float glass is lower than that of total oxygen combustion float glass; In the forming process, the water content of each layer of air combustion float glass does not change obviously, but the surface water content of oxygen combustion float glass decreases with the increase of H2 content and glass thickness of tin tank, but the water content of middle layer does not change, but the water content of tin surface layer only decreases with the increase of glass thickness. 2. By testing the structure and properties of peroxic combustion float glass and air combustion float glass, it is found that the proportion of Q3 structural unit in the former network structure increases and the proportion of Q4 structural unit decreases, and the high temperature viscosity decreases and the thermal expansion coefficient increases at the same temperature. EPMA test shows that the cations in the peroxy combustion float glass are easier to move and the depth of tin infiltration is greater. 3, the higher the water vapor ratio of melting atmosphere is, the higher the glass water content is. Through the simulation results of glass forming with different water content, it is found that the higher the glass water content, the smaller the gradient of tin infiltration concentration with depth, the greater the tin infiltration depth, and the faster the tin ion diffusion rate. 4. the simulated forming experiments of the basic glass melted in the atmosphere of total oxygen combustion and air combustion were carried out respectively. it was found that the tin content of the former could be well controlled when the H _ 2 content was 6-7%, and the tin infiltration could be suppressed by adding iron, but there was the best threshold, and the tin content was the least when the ratio of iron to tin was 0.4% by weight, and the tin content of the former was the lowest when the content of H _ 2 was 6-7%. 5. after using H _ 2 catalyst, the tin content of glass decreased by about 16% when the forming temperature was 105 鈩，
本文编号：2511759
文内图片：
图片说明：烧与空气燃烧示意图
[Abstract]:After using peroxic combustion technology, the moisture content of float glass increases, the amount of tin infiltrates is large, and the rainbow defect is serious. In order to investigate the variation of water in glass during float forming and its influence on tin infiltration, the variation of water content in the upper layer, middle layer and tin layer of oxygen combustion float glass and air combustion float glass was studied by FTIR, and the glass structure was studied by MAS-NMR, and the viscosity, thermal expansion coefficient and water resistance of glass were tested at the same time. The glass with different water content was prepared by controlling the melting atmosphere, and the correlation between water content and tin infiltration was studied by float simulation device, and the effect of H2 content and iron content on tin infiltration was studied, and the effect of H2 catalyst on reducing the tin content of glass was preliminarily explored. Through the analysis of various characterization methods and experimental results, the following conclusions are drawn: 1. The results of infrared spectrum analysis show that the water content of air combustion float glass is lower than that of total oxygen combustion float glass; In the forming process, the water content of each layer of air combustion float glass does not change obviously, but the surface water content of oxygen combustion float glass decreases with the increase of H2 content and glass thickness of tin tank, but the water content of middle layer does not change, but the water content of tin surface layer only decreases with the increase of glass thickness. 2. By testing the structure and properties of peroxic combustion float glass and air combustion float glass, it is found that the proportion of Q3 structural unit in the former network structure increases and the proportion of Q4 structural unit decreases, and the high temperature viscosity decreases and the thermal expansion coefficient increases at the same temperature. EPMA test shows that the cations in the peroxy combustion float glass are easier to move and the depth of tin infiltration is greater. 3, the higher the water vapor ratio of melting atmosphere is, the higher the glass water content is. Through the simulation results of glass forming with different water content, it is found that the higher the glass water content, the smaller the gradient of tin infiltration concentration with depth, the greater the tin infiltration depth, and the faster the tin ion diffusion rate. 4. the simulated forming experiments of the basic glass melted in the atmosphere of total oxygen combustion and air combustion were carried out respectively. it was found that the tin content of the former could be well controlled when the H _ 2 content was 6-7%, and the tin infiltration could be suppressed by adding iron, but there was the best threshold, and the tin content was the least when the ratio of iron to tin was 0.4% by weight, and the tin content of the former was the lowest when the content of H _ 2 was 6-7%. 5. after using H _ 2 catalyst, the tin content of glass decreased by about 16% when the forming temperature was 105 鈩，
本文编号：2511759
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