据结晶学、热力学与动力学理论， 利用 Ｔ Ｅ Ｍ、图象分析仪和计算机， 模拟了 ＣaO-Ａｌ２ Ｏ３-Ｓｉ Ｏ２ 系玻璃的液滴状分相过程， 研究中， 结合相变理论与实验数据， 建立了数学逻辑复合分相模型， 模拟结果表明， 由成核生长机理控制的玻璃液滴状分相， 形成对数分布的主要条件是： 液滴相临界半径必须在某一特定范围内波动； 液滴相生长相对线速度应是５ ％ ～１０ ％ ； 而开始分相液滴相临界半径和终止分相时液滴相半径的绝对值与分布类型无关本模拟方法为控制玻璃的纳米结构、研制特殊性能的玻璃材料提供了一种新的手段
According to the theory of crystallization chemistry, thermodynamics and kinetics, the process of droplet-like phase-separation of CaO-Al2O3-SiO2 glass
was simulated by using TEM, image analyzer and computer. The mathematics and logical model of phase-separation was developed on the basis of phase transition theory and
experiments. The key factors of following logarithmic normal distribution are that critical sizes of droplet phase nuclei must change in a certain range for the droplet-like phase-separation
controlled by the mechanism of nucleation-growth; relative growth rate of droplet phase locates at 5%--10%. The distribution type has no relationship to the absolute values of critical sizes
when phase-separation takes place, and to the droplet phase diameter when the droplet phase stops growing. This simulation method leads to a new way to control nanometre structure of glass and make a noval glass
materials with some special properties.
参考文献
| [1] | Lifshitz I M, Slyozov V V. J. Phys. Chem. Solids, 1961, 19 (1/2): 35--50 2 Haller W. J. Phys. Chem. Solids, 1965, 42 (2): 686--693 3 McCurries R A, Douglass R W. Phys. Chem. Glasses, 1967, 8 (4): 132--139 4 Cahn J W. J. Chem. Phys., 1865, 42: 93--99 5 刘平, 陈显求, 许淑惠. 玻璃与搪瓷, 1993, 21 (3): 11--14 6 Zarzyck J, Naudin F. Phys. Chem. Glasses, 1967, 8 (1): 11-18 7 宋俊杰编, 统计信息分析 (上册). 天津: 南开大学出版社, 1986. 85--87 8 刘平. 博士学位论文. 上海: 中国科学院上海硅酸盐研究所, 1993. 61--62 |
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