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Understanding the crystallization mechanism of a wollastonite base glass using isoconversional, IKP methods and master plots

机译:使用等转换,IKP方法和主图了解硅灰石基玻璃的结晶机理

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摘要

The complex development of crystals found in the crystallization of a SiO2-Al2O3-CaO-Na2O glass has been explained using Differential Thermal Analysis. The crystal growth process has been studied using isoconversional, invariant kinetic parameters and master plots methods. The applied kinetic models have revealed activation energy values that are over 360 kJ/mol and 385 kJ/mol by employing the integral and differential kinetic methods, respectively. The crystallization process schedule that was previously observed by scanning electron microscopy has been corroborated in this study using the kinetic methods. The crystallization of wollastonite occurs through a complex two-stage mechanism, with early three-dimensional growth of crystals (A3 mechanism) on the surface of glass particles followed by one-dimensional growth of needles (A3/2 mechanism) towards the interior of grains. The results presented in this paper are in agreement with a previous paper that employed the Kissinger non-isothermal method and the Ligero approximation
机译:使用差示热分析已经解释了在SiO2-Al2O3-CaO-Na2O玻璃的结晶中发现的晶体的复杂发展。晶体生长过程已使用等转化,不变动力学参数和主图方法进行了研究。应用的动力学模型通过采用积分和微分动力学方法分别揭示了超过360 kJ / mol和385 kJ / mol的活化能值。这项研究使用动力学方法证实了以前通过扫描电子显微镜观察到的结晶过程时间表。硅灰石的结晶通过复杂的两阶段机制发生,即玻璃颗粒表面早期晶体的三维生长(A3机理),然后向晶粒内部一维针状生长(A3 / 2机理)。 。本文提供的结果与先前采用Kissinger非等温方法和Ligero逼近的论文相符

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