Theoretical study on the glass–crystal transformation and deduction of its kinetic parameters by DSC, using non-isothermal regime

Vázquez, J.; González-Palma, R.; Villares, P.; Jiménez‐Garay, R.

doi:10.1016/s0921-4526(03)00296-5

Cited by 11 publications

(4 citation statements)

References 24 publications

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“…In general, the larger the value of n is, the more easily devitrification occurs and the more unsteady the glass becomes. When n is between 0 and 3, the crystallization mode is surface crystallization, while volume crystallization occurs when n ≥ 3, as per the following equation [22][23][24]:…”

Section: Crystallization Kinetics Analysismentioning

confidence: 99%

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Crystallization Kinetics of Basalt Glass-Ceramics Produced from Olivine Basalt Rock

et al. 2022

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Glass-ceramics acquired from the melting of rocks have a vast application marketplace. In this study, an olivine basalt rock from Zhangjiakou in China was selected as a raw material to prepare basalt glass-ceramics, and the crystallization kinetics of olivine basalt glass was investigated using differential thermal analysis. Polarizing microscope and X-ray diffraction (XRD) analysis results revealed that the main mineral compositions of olivine basalt are plagioclase, pyroxene, olivine, and iron oxide(s). Three crystallization peaks were observed in the DSC curve of the olivine basalt glass. The Avrami exponent (n), apparent activation energies for the crystallization, and glass transition of basalt glass were determined using the Owaza method based on data obtained from isothermal measurements. The crystallization activation energies (E) of the three crystallization peaks of olivine basalt glass were 314.20 kJ/mol, 1232.49 kJ/mol, and 696.89 kJ/mol, respectively. In addition to this, the crystal growth index indicated that the crystallization mode in the olivine basalt glass was surface crystallization. The crystallization phases and microstructure of the olivine basalt glass heated at 860 °C, 1100 °C, and 1180 °C were also studied. The conclusions obtained offer some useful information for the preparation of basalt glass-ceramics from olivine basalt rocks.

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Section: Crystallization Kinetics Analysismentioning

confidence: 99%

“…surface crystallization, while volume crystallization occurs when n ≥ 3, as per the following equation [22][23][24]:…”

Section: Crystallization Analysismentioning

confidence: 99%

Crystallization Kinetics of Basalt Glass-Ceramics Produced from Olivine Basalt Rock

et al. 2022

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“…The activation energy of crystallization of the MBG is far greater than that of the BG, which means that the stability of the MBG is much better than that of BG. Based on the obtained crystallization activation energy, the crystal growth index (n) can be well approximated by the Augis-Bennett Equation [28,29]:…”

Section: Crystallization Kineticsmentioning

confidence: 99%

“…where ΔT is the half maximum temperature of the DSC crystallization exothermic peak. According Based on the obtained crystallization activation energy, the crystal growth index (n) can be well approximated by the Augis-Bennett Equation [28,29]:…”

Section: Crystallization Kineticsmentioning

confidence: 99%

Crystallization Kinetics of Modified Basalt Glass

et al. 2020

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As the raw material for the production of basalt continuous fibers in Sichuan, basalt glass (BG) and modified basalt glass (MBG) were prepared by the melt quenching method with the basalt and chemically modified basalt, respectively. The crystallization kinetics of BG and MBG were investigated by differential scanning calorimetry (DSC) according to Kissinger methods. The results revealed that it is difficult for both glasses to crystallize at a high temperature. In addition, the crystallization activation energy of MBG is much higher than that of BG, which indicates that MBG is more difficult to crystallize than BG. The crystalline phases seemed to be formed from the surface of the two glasses. The morphologies and crystal structure of the crystalline phases in the heat-treated BG and MBG were analyzed by scanning electron microscope (SEM/EDX) and XRD. It was found that only a small amount of crystalline phase can be observed in the MBG, which indicates that the crystallization ability of the MBG was greatly suppressed. Results of this initial investigation indicate that chemical modification can effectively suppress the crystallization tendency of basalt glass and improve its thermal stability, which opens up an effective way for the industrial scale and stable production of basalt fiber.

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