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Porous mullite thermal insulators from coal gangue fabricated by a starch-based foam gel-casting method
School of Material Science and Engineering, China University of Mining and Technology, Xuzhou.
School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou.
School of Material Science and Engineering, China University of Mining and Technology, Xuzhou.
School of Material Science and Engineering, China University of Mining and Technology, Xuzhou.
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Number of Authors: 5
2017 (English)In: Journal of the Australian Ceramic Society, ISSN 2510-1560Article in journal (Refereed) Epub ahead of print
Abstract [en]

Porous mullite materials with high porosity of 71.8–88.2% were prepared by foaming of coal gangue/Al2O3/starch composite slurry and subsequent pore structure stabilization using starch consolidation and sintering. Coal gangue was recycled to prepare porous mullite foams. Starch was used as gellant, replacing commonly used poisonous chemical and expensive animal protein additives in foaming. Sintered mullite foams exhibited tri-modal pore structure, including large-sized pores (50–300 μm) replicating gas bubbles, moderate-sized pores (~10 μm) embedded in pore walls, and small-sized pores (<5 μm) appearing among mullite crystals. The compressive strength of mullite foams was between 0.21 and 8.7 MPa with low thermal conductivity between 0.1056 and 0.3848 W/m K, indicating that porous mullite foams are candidate materials for applications in thermal insulation.

Place, publisher, year, edition, pages
2017.
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-62542DOI: 10.1007/s41779-017-0035-9OAI: oai:DiVA.org:ltu-62542DiVA: diva2:1082502
Available from: 2017-03-16 Created: 2017-03-16 Last updated: 2017-03-16

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