Fabrication of lightweight ceramics of complex geometries in freezing weather

A stable aqueous-based alumina slurry (16 vol%) was formulated and frozen at −10 to −25 °C in natural freezing environment. The thermally treated ceramic monoliths achieved ∼82–88 vol% porosity with short-range aligned pores. Finally, the unidirectional pores in the structure are achieved u...

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Bibliographic Details
Published in:Materials Letters
Main Authors: Hossain, SK Saddam, Akhtar, Farid
Format: Article in Journal/Newspaper
Language:English
Published: Luleå tekniska universitet, Materialvetenskap 2024
Subjects:
Arctic region
Freeze casting
Natural weather
Porous ceramic
Materials Engineering
Materialteknik
Chemical Sciences
Kemi
Arctic
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-105844
https://doi.org/10.1016/j.matlet.2024.136633
Description
Summary:A stable aqueous-based alumina slurry (16 vol%) was formulated and frozen at −10 to −25 °C in natural freezing environment. The thermally treated ceramic monoliths achieved ∼82–88 vol% porosity with short-range aligned pores. Finally, the unidirectional pores in the structure are achieved using a mold with thermal insulation properties. Natural freezing saves 300 kJ of energy per kg of alumina slurry. Mechanically stable lightweight porous ceramics with complex geometries can be designed without cryogenic fluids, refrigeration, or thermal baths. Implementing natural freezing in the porous ceramics industries, particularly in the Arctic region, will bring forward a sustainable approach by reducing energy consumption and CO2 emissions. Full text license: CC BY

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