基于有限元法模拟微晶玻璃的微晶化加热过程
发布时间:2018-06-20 20:50
本文选题:微晶玻璃 + 微晶化过程 ; 参考:《材料导报》2017年20期
【摘要】:以CaO-Al_2O_3-SiO_2系基础玻璃为研究对象,基于ANSYS有限元分析对基础玻璃微晶化过程进行了数值模拟,得到了基础玻璃内部中心点和端点温度场随时间的变化曲线方程。结果显示,在从室温加热到核化温度阶段(25~780℃)和从核化温度加热到晶化温度阶段(780~1 080℃),基础玻璃内部的中心点温度和端点温度值随时间变化与指数方程拟合度较高。为防止在加热过程中温度场中有较大的温度梯度分布和热应力的产生,在25~780℃阶段的升温速率应控制在2~4℃/min;在780~1 080℃阶段的升温速率应控制在0~2℃/min。通过差热分析和X射线衍射等分析手段对以3℃/min的升温速率升至核化温度(780℃)后又以1℃/min的升温速率升至晶化温度(1 080℃)后制得的CaO-Al_2O_3-SiO_2系微晶玻璃进行了实验验证,得到了主晶相为硅灰石(CaSiO_3)和含铁硅灰石类固溶体((Ca,Fe)SiO_3)且性能优异的微晶玻璃。
[Abstract]:Taking CaO-Al _ 2O _ 3-SiO _ 2 basic glass as the research object, the process of basic glass crystallization was numerically simulated based on ANSYS finite element analysis, and the curve equation of the temperature field of the inner center and end point of the base glass with time was obtained. The results show that the temperature of the center point and the end point of the base glass vary with time and the fitting degree of the exponential equation is higher when the temperature from room temperature to nucleation temperature is 25 ~ 780 鈩,
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