摘 要

柔性玻璃是厚度小于0.1mm的超薄玻璃，是一种可弯曲，非常柔韧材质的物质。柔性玻璃不仅改变了传统玻璃刚性、易碎的特点，实现了玻璃的柔性革命化创新，而且在未来柔性显示、可折叠设备领域等方面具有重大的使用价值，在如今信息化的时代，其应用前景十分广阔。目前，柔性玻璃的制备有多种方法，其中狭缝下拉法这种工艺制备的玻璃厚度根据熔窑的拉引量、狭缝的大小及下拉速度来控制，玻璃的翘曲度根据温度分布的均匀性控制，可以连续生产柔性玻璃。温度在柔性玻璃成形过程中对柔性玻璃的粘度，板厚度以及制品质量都有着及其重要的作用。

本文通过调整空气介质温度和玻璃液自身温度范围，并运用FLOW3D计算流体力学软件仿真模拟玻璃狭缝下拉成形，明确了柔性玻璃的具体成形过程，并探明了温度对柔性玻璃狭缝下拉过程的影响规律。

研究结果表明：温度制度是柔性玻璃成形过程中一个非常重要的工艺指标，关系到玻璃液粘度和流速的变化，从而影响玻璃液的厚薄程度，如果温度指标不合理，会直接影响到成形质量。

（1）对于本文选取的中碱玻璃组成，在玻璃液合适的成形温度范围内，1090℃的进口玻璃液温度是一个临界值，高于其温度，玻璃液带就会断裂，在介质温度和漏板温度不变的前途下，1090℃的玻璃液带成形厚度最薄为0.23mm，柔性玻璃的厚度指标为最优，并且粘度与温度的分布较均匀，所以当进口玻璃液温度为1090℃左右时，是最为合适的成形温度。

（2）金属漏板的温度高低会通过导热来影响玻璃成形，当漏板的温度越高于玻璃液温度，其向玻璃液传递的热量就多，玻璃液吸收热量会使粘度变小，流动性能变大，在重力作用的拉制下，玻璃液变薄容易断裂。当漏板的温度越低于玻璃液温度，玻璃液向漏板传递一部分热量，会导致玻璃液的粘度变大，所以在玻璃液温度为1090℃和介质温度为1020℃的前提下，选取了最为理想的漏板温度1050℃，在1050℃的等温图和等粘度图中，温度、粘度分布最为均匀，玻璃液的流速变化较为缓慢，防止出现因为粘度不均匀而导致的玻璃板厚度不平整。

（3）周围介质与玻璃液的换热过程会直接影响玻璃的成形效果，周围介质温度低，玻璃液与介质进行换热的速度越快，散失的热量就会较多，粘度增大的趋势加快，不利于制备较薄的平板玻璃。在介质温度为750℃时，粘度从250.8Pa·s增长到492.7Pa·s,粘度的增长趋势较缓，玻璃液的最小厚度为0.27mm。在改变介质温度但玻璃液成形的等温面均匀程度差别不大的情况下，选取厚度最接近柔性玻璃条件的数据作为适合玻璃成形的介质温度。

本文的特色：通过研究玻璃液进口温度、金属漏板温度、周围介质温度对狭缝下拉成形过程的玻璃液粘度、速度和流动性能影响的研究，调整温度变量进行分析对比，此外利用了FLOW3D计算流体力学软件仿真模拟玻璃狭缝下拉工艺，从而得到适合玻璃成形的最佳温度范围，对实际生产中具有一定的指导意义。

关键词：柔性玻璃；狭缝下拉成形；温度；FLOW3D

Abstract

Flexible glass is a material with high flexibility, whose thickness is less than 0.1mm. Flexible glass not only becomes more rigid and fragile than the traditional glass, but also showing revolutionary innovation and great value in some areas such as the future flexible display, folding equipment. Its prospect is quite broad especially in the age of information. At present, there are many ways to prepare flexible glass, in which the slit down method can prepare the the kind of glass whose thickness can be uniformity controlled according to the temperature distribution of glass by the drawing of the furnace, the size of the slit and the rate of pulling down, and the Curl of glass war page. In this way continuous flexible glass can be produced. The temperature plays an important role in viscosity, plate thickness and product quality in forming process of flexible glass.

In this paper, the concrete forming process of the flexible glass is clarified by adjusting the temperature range of the atmospheric temperature and the temperature of the glass, also the use of FLOW3D computational fluid dynamics software to simulate the drawing process of the glass slit. In addition the forming mechanism of the temperature on the sliding process of the flexible glass slit is proved .

The results show that the temperature system of glass is a very important process index in the process of flexible glass forming, which is related to the change of flow rate and viscosity of glass liquid, and affects the thickness of glass. If the temperature index is unreasonable, the forming quality of glass will bring down.

（1）In the appropriate molding temperature range of glass, 1090 ℃ is a critical value in inlet glass temperature. If the temperature is higher than 1090 ℃,the glass ribbon will break. When the medium temperature and Leaking plate temperature keep the same, the thickness of the glass ribbon is 0.23mm at least in 1090 ℃, and the temperature distribution is more uniform. So when the inlet glass temperature is about 1090 ℃, is the most suitable forming temperature.

（2）The temperature of the metal drain plate will affect the glass forming by affecting heat conduction. The temperature of the drain plate is higher, the amount of heat transferred to the glass liquid is larger. The heat absorption of the glass liquid will make the viscosity smaller and the flow performance becomes larger. Because of the gravity, the glass will become thinning and easily broken. The temperature of the molten steel is quite low.In this way, the glass liquid can convey a part of the heat from the drain plate, which will causes the viscosity of the molten glass to become larger. Therefore, when the glass temperature is 1090 ℃ and the medium temperature is 1020 ℃, the most ideal leakage temperature 1050 ℃.In this isothermal and isometric diagram, the temperature and viscosity distribution is the most uniform, glass flow rate changes more slowly, which can prevent the uneven viscosity due to the glass plate thickness is not smooth.

（3）The heat transfer process of the surrounding medium and the glass liquid will directly affect the forming effect of the glass. If the temperature of the surrounding medium is lower, the faster the heat exchange rate of the molten glass and the medium will be, additionally the more heat will be lost. And the tendency of increasing the viscosity will be faster, which is bad for preparing thin glass. When the medium temperature is 750 ℃, the viscosity increases from 250.8Pa-s to 492.7Pa-s, the growth trend of viscosity is quite slow, and the minimum thickness of glass is 0.27mm. In the case where the temperature of the medium is changed but the isothermal surface of the glass is not significantly different, the data whose thickness is resemble most the flexible glass is selected as the medium temperature suitable for glass forming.

This paper studies the affecting of the glass liquid inlet temperature, the temperature of metal slab and the temperature of the surrounding medium in the temperature, velocity and flow performance of the glass to analyze and compare the difference between different temperature. What’s more by using the FLOW3D calculation fluid The simulation software simulates the glass slit drawing process, the most suitable temperature range of glass forming can be get, which has certain guiding significance for the future production.

Key words: flexible glass; slit drop form; temperature; FLOW3D

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