The crystallization mechanism of high-cordierite glass
作者： Koichi Watanabe , Edward A. Giess , Merrill W. Shafer
DOI: 10.1007/BF01026520
关键词: Composite material 、 Reaction mechanism 、 Differential thermal analysis 、 Materials science 、 Crystallography 、 Supercooling 、 Atmospheric temperature range 、 Nucleation 、 Growth rate 、 Crystallization 、 Cordierite
摘要: The crystallization mechanism of high-cordierite (2MgO·2Al2O3·5SiO2) from a bulkglass containing B2O3 and P2O5 as nucleating agents was studied using X-ray diffraction, differential thermal analysis polarizing microscope. Thin glass specimens, with mirror surface, were heated rapidly in an electric furnace the temperature range 888 to 1363° C for desired time then quenched room temperature. normal rate growth precipitated cordierite crystals measured their morphological change observed photographically. increased temperature, maximum occurred at about 1250° C. crystal morphology hexagonalprismatic, elongated along thec-axis. Faceted interface when undercooling 7 174° Judging relationship between reduced degree undercooling, lower governed by layer depending on surface nucleation mechanism. In higher continuous seen intermediate transition evident.
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