Crystallization behavior and structural evaluation of cordierite base glass-ceramic in the presence of CaO and B2O3 additives

Synthesis and Sintering Pub Date : 2022-12-31 DOI:10.53063/synsint.2022.24136

Zahra Shamohammadi Ghahsareh, M. Rezvani

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引用次数: 1

Abstract

The purpose of the present work is to highlight the role of CaO and B2O3 additives on the crystallization behavior and microstructural properties of stoichiometric cordierite glass-ceramics using differential thermal analysis (DTA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Vickers micro-hardness and scanning electron microscopy (SEM). The results show that the presence of B2O3 and CaO in the initial glass led to the precipitation of only one exothermic peak (α-cordierite: Mg2Al4Si5O18). During the heat treatment process, the presence of calcium oxide favors crystallization of anorthite (CaAl2Si2O8) besides α-cordierite phase. It is worth mentioning that, CaO and B2O3 additives strongly encourage the formation of α-cordierite and have the opposite effect on the crystallization of μ-cordierite. In order to determine the effect of crystallization and B2O3 and CaO additives on the hardness of specimens, the micro-hardness measurement of glasses and glass-ceramics shows that the glass-ceramic containing CaO (MAS5C) exhibits the highest micro-hardness value, which depends on the high crystallinity value in this specimen.

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CaO和B2O3添加剂存在下堇青石基玻璃陶瓷的结晶行为及结构评价

利用差热分析(DTA)、x射线衍射(XRD)、傅里叶变换红外光谱(FTIR)、维氏显微硬度和扫描电镜(SEM)研究了CaO和B2O3添加剂对化学计量堇青石微晶玻璃结晶行为和微观结构性能的影响。结果表明:初始玻璃中B2O3和CaO的存在只导致析出一个放热峰(α-cordierite: Mg2Al4Si5O18);在热处理过程中，除了α-堇青石相外，氧化钙的存在有利于钙长石(CaAl2Si2O8)的结晶。值得一提的是，CaO和B2O3添加剂对α-堇青石的形成有强烈的促进作用，对μ-堇青石的结晶有相反的作用。为了确定结晶以及B2O3和CaO添加剂对试样硬度的影响，对玻璃和微晶玻璃的显微硬度测量表明，含CaO (MAS5C)的微晶玻璃的显微硬度值最高，这取决于该试样的高结晶度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Synthesis and Sintering

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