Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 803, Issue -, Pages 981-991Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.06.272
Keywords
Mullite; Porous ceramics; Closed pores; Reaction synthesis process; Fly ash; Bauxite
Categories
Funding
- open research fund for State Key Laboratory of Advance Refractories [SKLAR201904]
- Fundamental Research Fund for the Central Universities [N150204021]
- National Natural Science Foundation of China [51772277]
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Fly ash is a typical industrial solid waste that seriously affects human health and ecological balance. In order to recycle the fly ash, in this work, porous mullite ceramics were successfully fabricated with fly ash and bauxite via reaction synthesis process. Effects of firing temperature (1450-1550 degrees C), silicon carbide addition amount (0-15 wt%), and potash feldspar addition amount (0-16 wt%) on the mullite porous ceramics were systematically investigated. It was found that increasing the silicon carbide addition amount or raising firing temperature was favourable for improving the cold compressive strength and thermal shock resistance of the porous ceramics. Consequently, the porous ceramics with 10 wt% silicon carbide, 4-12 wt% potash feldspar had optimal overall performances. The closed porosity and cold compressive strength ranges were 14.79%-18.57% and 217.18-236.67 MPa, respectively. The thermal cycles were 7-9 times, and the thermal conductivity was reached to 2.19-2.52 W m(-1) K-1 at 800 degrees C. This work provides a convenient and promising method for the utilization of fly ash. (C) 2019 Elsevier B.V. All rights reserved.
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