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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Mullite-based ceramic tiles produced solely from high-alumina fly ash: Preparation and sintering mechanism
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Mullite-based ceramic tiles produced solely from high-alumina fly ash: Preparation and sintering mechanism

机译：基于莫来石的陶瓷瓷砖仅由高氧化铝飞灰制作：制备和烧结机构

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摘要

Mullite-based ceramic tiles were successfully prepared using only high-alumina fly ash (HAFA) at relatively low sintering temperatures (1100-1400 degrees C). The effects of alkali activation on the chemical composition, mineral phase, and morphology of the HAFA were respectively characterised by ICP-OES, XRD, and SEM methods. The alkali-activation pretreatment not only modifies the chemical composition of HAFA to match that of mullite, but also can introduce Na-rich compounds to promote sintering. The macroscopic and microscopic characteristics of the fully ash-based ceramic tiles formed at different sintering temperatures were examined. The ceramic samples sintered at 1300 degrees C exhibited optimal post-sintering properties (relative density: 90.85%, water absorption: 0.10%, rupture modulus: 109.67 MPa, linear shrinkage: 15.70%, and apparent porosity: 0.68%) and a well-developed cubic puncheon-shaped mullite morphology. Finally, through the isothermal sintering method, the melt viscosities and the sintering kinetics were calculated theoretically, and the results show that the alkali activation could dramatically reduce the melt viscosity and the apparent activation energy. This research may provide a new method in utilising the vast amounts of HAFA waste to produce mullite-based ceramic tiles at low costs. (C) 2017 Elsevier B.V. All rights reserved.
机译：在相对低的烧结温度下仅使用高氧化铝粉煤灰（HAFA）成功制备莫来石陶瓷砖（1100-1400℃）。通过ICP-OES，XRD和SEM方法表征碱活化对HAFA的化学成分，矿物相和形态的影响。碱活化预处理不仅改变了HAFA的化学成分，以与莫来石相匹配，而且还可以引入富含Na的化合物以促进烧结。检查了在不同烧结温度下形成的完全灰分的陶瓷砖的宏观和微观特性。在1300摄氏度下烧结的陶瓷样品表现出最佳的烧结性能（相对密度：90.85％，吸水性：0.10％，破裂模量：109.67MPa，线性收缩：15.70％，表观孔隙率：0.68％）和井 - 开发了立方体流行型莫来石形态。最后，通过等温烧结方法，理论上计算熔体粘度和烧结动力学，结果表明，碱活化可以显着降低熔体粘度和表观活化能量。该研究可以在利用大量的Hafa废物中提供一种新方法，以便以低成本生产莫来石瓷砖。 （c）2017年Elsevier B.V.保留所有权利。

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