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- W2067049679 abstract "Spherical shaped spray-dried admixtures of chemical pure and very fine α-Al2O3 and quartz powders with mullite composition (72 wt% Al2O3, 28 wt% SiO2) were used as starting materials. The spray-dried powders (10–100 μm) were melted in a nitrogen plasma flame and subsequently quenched in water thus producing spherical, hollow, and porous particles (≤ 100 μm). The as-quenched spherules consist of mullite glass, some residual α-Al2O3 and quartz, and a very low amount of newly formed mullite. Double quenching of the material increases the glass content to >90 wt.%. 27Al and 29Si MAS NMR studies show that the rapidly quenched mullite glass is composed of a network of (SiO)-tetrahedra and (AlO)-octahedra, -pentahedra, and -tetrahedra. The frequency distribution of (AlO)-structural units is similar to those in metakaolinite, type I (polymer) mullite precursors, and in other melt-quenched aluminium-silicate glasses suggesting strong structural similarities of these phases. This has been supported by the exothermic mullite crystallization process taking place at ≈ 980 °C in all cases." @default.
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- W2067049679 date "1995-01-01" @default.
- W2067049679 modified "2023-09-28" @default.
- W2067049679 title "Constitution of mullite glasses produced by ultra-rapid quenching of plasma-sprayed melts" @default.
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- W2067049679 doi "https://doi.org/10.1016/0955-2219(95)00105-0" @default.
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