【摘要】：采用全氧燃燒技術(shù)后,浮法玻璃含水量增加,滲錫量大、虹彩缺陷嚴(yán)重。為探究玻璃中的水在浮法成形過程中的變化規(guī)律及對滲錫的影響,本文采用FTIR研究了全氧燃燒浮法玻璃和空氣燃燒浮法玻璃上表層、中間層和錫面層含水量的變化規(guī)律；用MAS-NMR對玻璃結(jié)構(gòu)進(jìn)行研究,同時對玻璃粘度、熱膨脹系數(shù)、耐水性進(jìn)行測試；通過控制熔化氣氛條件制備含水量不同的玻璃,并通過浮法模擬裝置進(jìn)行成形,研究含水量與滲錫的相關(guān)性；研究H2含率、加鐵量對滲錫的影響,初步探索H2催化劑對減少玻璃滲錫量的作用效果。通過各項表征手段和實驗結(jié)果分析得出以下結(jié)論： 1、紅外光譜分析結(jié)果表明：空氣燃燒浮法玻璃含水量低于全氧燃燒浮法玻璃；在成形過程中空氣燃燒浮法玻璃各層含水量變化不明顯,而全氧燃燒浮法玻璃上表層含水量隨錫槽H2含率和玻璃厚度的增加而減少,中間層含水量不發(fā)生變化,錫面層含水量僅隨玻璃厚度增加而減少。 2、通過對全氧燃燒浮法玻璃和空氣燃燒浮法玻璃結(jié)構(gòu)和性能進(jìn)行測試,結(jié)果發(fā)現(xiàn)前者網(wǎng)絡(luò)結(jié)構(gòu)中Q2、Q3結(jié)構(gòu)單元所占比例增加、Q4結(jié)構(gòu)單元比例減少；相同溫度下高溫粘度降低,熱膨脹系數(shù)增大；EPMA測試發(fā)現(xiàn)全氧燃燒浮法玻璃中陽離子比較容易移動,玻璃滲錫深度更大。 3、熔制氣氛水汽比越大,玻璃含水量越高,通過對不同含水量玻璃成形模擬實驗結(jié)果分析發(fā)現(xiàn)：玻璃含水量越高,滲錫濃度隨深度變化梯度越小,滲錫深度越大,錫離子擴散速率越快。 4、分別對全氧燃燒和空氣燃燒氣氛條件下熔制的基礎(chǔ)玻璃進(jìn)行模擬成形實驗,通過比較發(fā)現(xiàn)H2含率在6-7%時,前者的滲錫量可以得到較好的控制；加鐵可以抑制滲錫,但有最佳的閾值,實驗中加鐵占錫0.4%重量比時,滲錫量最少； 5、使用H2催化劑后,成形溫度為105℃條件下玻璃的滲錫量較空白組下降約16%；在成形溫度為900℃條件下,滲錫量下降不明顯。
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圖片說明：燒與空氣燃燒示意圖
[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，

本文編號：2511759