Crystallisation of silicate glasses and melts with chemical compositions in primary phase region of gehlenite

Masahiro Susa, Kodai Sasaki, Takaaki Yamauchi, Takashi Watanabe, Rie Endo, Miyuki Hayashi, Masahito Hanao

研究成果: Article査読

2 被引用数 (Scopus)

抄録

Crystallisation behaviour has been investigated on samples with two compositions: (A) 42CaO-37SiO2-21Al2O3 and (B) 43CaO-27SiO2-19Al2O3-11CaF2 (all mass%). Composition (A) is within the primary phase region of gehlenite and composition (B) is just between gehlenite and cuspidine on a mass basis. Two types of sample were prepared from glassy and molten states for each composition. These samples were characterised by differential thermal analysis, X-ray diffraction analysis and electron probe microanalysis. - Crystallised samples A from glassy state: It contained gehlenite and wollastonite in the XRD profile, and in BE images gehlenite crystals grew more largely than wollastonite, suggesting that gehlenite precipitates in preference to wollastonite. - Crystallised samples B from glassy state: It contained cuspidine and gehlenite in the XRD profile. In BE images, cuspidine precipitated but gehlenite was not observed. - Crystallised samples A from molten state: It contained only gehlenite in the XRD profile, and in BE images there was dendritic gehlenite developed across the sample. - Crystallised samples B from molten state: It contained cuspidine and CaF2 as well as gehlenite in the XRD profile. In BE images, gehlenite comprised the major part, and it is likely that gehlenite crystallises in preference to cuspidine. It is also likely that the pseudo-binary system of gehlenite and cuspidine forms eutectics and that the eutectic composition is rather closer to cuspidine. Consequently, the increase in Al2O3 concentration would little affect crystallisation of the glassy portion in actual mould fluxes containing CaF2 but strongly affects crystallisation of the liquid portion.

本文言語English
ページ(範囲)58-64
ページ数7
ジャーナルISIJ International
60
1
DOI
出版ステータスPublished - 2020
外部発表はい

ASJC Scopus subject areas

  • 材料力学
  • 機械工学
  • 金属および合金
  • 材料化学

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