doi:10.1007/s12613-019-1951-1

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文章导航 > 矿物冶金与材料学报（英文） > 2020 > 27(7): 924-932

Hai-yan Yu, Xiao-lin Pan, Yong-pan Tian, and Gan-feng Tu, Mineral transition and formation mechanism of calcium aluminate compounds in CaO−Al₂O₃−Na₂O system during high-temperature sintering, Int. J. Miner. Metall. Mater., 27(2020), No. 7, pp. 924-932. https://doi.org/10.1007/s12613-019-1951-1

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Hai-yan Yu, Xiao-lin Pan, Yong-pan Tian, and Gan-feng Tu, Mineral transition and formation mechanism of calcium aluminate compounds in CaO−Al2O3−Na2O system during high-temperature sintering, Int. J. Miner. Metall. Mater., 27(2020), No. 7, pp. 924-932. https://doi.org/10.1007/s12613-019-1951-1

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Research Article

Mineral transition and formation mechanism of calcium aluminate compounds in CaO−Al₂O₃−Na₂O system during high-temperature sintering

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Abstract

The mineral transition and formation mechanism of calcium aluminate compounds in CaO−Al₂O₃−Na₂O system during the high-temperature sintering process were systematically investigated using DSC−TG, XRD, SEM−EDS, FTIR, and Raman spectra, and the crystal structure of Na₄Ca₃(AlO₂)₁₀ was also simulated by Material Studio software. The results indicated that the minerals formed during the sintering process included Na₄Ca₃(AlO₂)₁₀, CaO·Al₂O₃, and 12CaO·7Al₂O₃, and the content of Na₄Ca₃(AlO₂)₁₀ could reach 92wt% when sintered at 1200°C for 30 min. The main formation stage of Na₄Ca₃(AlO₂)₁₀ occurred at temperatures from 970 to 1100°C, and the content could reach 82wt% when the reaction temperature increased to 1100°C. The crystal system of Na₄Ca₃(AlO₂)₁₀ was tetragonal, and the cells preferred to grow along crystal planes (110) and (210). The formation of Na₄Ca₃(AlO₂)₁₀ was an exothermic reaction that followed a secondary reaction model, and its activation energy was 223.97 kJ/mol.
- calcium aluminate;
- sodium oxide;
- crystal structure;
- formation kinetics;
- sintering

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Mineral transition and formation mechanism of calcium aluminate compounds in CaO−Al₂O₃−Na₂O system during high-temperature sintering

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