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Cellular ceramic foam derived from potassium-based geopolymer composite: Thermal, mechanical and structural properties
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SYSNO ASEP 0559334 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Cellular ceramic foam derived from potassium-based geopolymer composite: Thermal, mechanical and structural properties Author(s) Kovářík, T. (CZ)
Hájek, J. (CZ)
Pola, M. (CZ)
Rieger, D. (CZ)
Svoboda, M. (CZ)
Beneš, J. (CZ)
Šutta, P. (CZ)
Deshmukh, K. (CZ)
Jandová, Věra (UCHP-M) RID, ORCID, SAIArticle number 109355 Source Title Materials and Design. - : Elsevier - ISSN 0264-1275
Roč. 198, JAN 15 (2021)Number of pages 14 s. Language eng - English Country GB - United Kingdom Keywords geopolymer mixture ; viscosity ; replica impregnation OECD category Physical chemistry Method of publishing Open access Institutional support UCHP-M - RVO:67985858 UT WOS 000606821000001 EID SCOPUS 85096826821 DOI 10.1016/j.matdes.2020.109355 Annotation Porous geopolymers have drawn widespread attention owing to the flexibility of the production processes and the diversity of their structural properties. This paper first investigates and describes the key parameters for the fabrication of ceramic foam based on a geopolymer mixture by impregnation using the replica technique. The influence of geopolymer mixture viscosity on total porosity, pore size and mechanical strength of leucite ceramic foams is evaluated. The accelerated solidification step at 70 °C was investigated using time-dependent viscoelastic parameters such as tan δ, G' and G. For the fabrication of highly porous ceramics based on the geopolymer mixture, the optimum viscosity ranges between 9 and 15 Pa.s at 100 s−1. Differential thermal analysis (DTA) and X-ray diffraction (XRD) indicated the crystallization of the main leucite phase at 1073.5 °C, during the thermal exposure up to 1300 °C. It has been revealed that ceramic foam with an open porosity of 76 to 79 vol% can be fabricated using a replica technique. Scanning electron microscopy (SEM) and X-ray micro-computed tomography (micro-CT) have confirmed interconnected macroporosity with an open pore size up to 2 mm. This study introduces a novel group of materials combining geopolymer chemistry and traditional production of ceramic foams. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S0264127520308911?via%3Dihub
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