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Temperature dependence of Young's modulus of silica refractories
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SYSNO ASEP 0472845 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Temperature dependence of Young's modulus of silica refractories Tvůrce(i) Gregorová, E. (CZ)
Černý, Martin (USMH-B) RID, ORCID, SAI
Pabst, W. (CZ)
Esposito, L. (IT)
Zanelli, C. (IT)
Hamáček, J. (CZ)
Kutzendorfer, J. (CZ)Zdroj.dok. Ceramics International. - : Elsevier - ISSN 0272-8842
Roč. 41, č. 1 (2015), s. 1129-1138Poč.str. 10 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. GB - Velká Británie Klíč. slova mechanical properties ; elastic modulus (Young's modulus) ; SiO2 ; Silica brick materials (cristobalite, tridymite) Vědní obor RIV JH - Keramika, žáruvzdorné materiály a skla Institucionální podpora USMH-B - RVO:67985891 UT WOS 000346216500032 EID SCOPUS 84923050879 DOI https://doi.org/10.1016/j.ceramint.2014.09.039 Anotace The temperature dependence of Young's modulus of silica refractories exhibiting pore volume fractions in the range 18.6-20.9% is investigated via impulse excitation up to 800-1000 degrees C and four-point bending up to 500 degrees C. This temperature dependence exhibits a broad valley approximately below 200 degrees C, where Young's modulus values decrease to 55-62% of their room temperature magnitude. Upon further heating, Young's modulus increases steeply within a few degrees around 230 degrees C, followed by an S-shaped increase to maximum values corresponding to 174-282% of the room temperature values. Cooling branches are different from heating branches and do not form closed loops, indicating damage accumulation. Dilatation measurements, polarization microscopy, micromechanical calculations and X-ray phase analysis are used to underpin the conclusion that the observed elastic effects are not caused by phase transitions alone, but are combined effects of phase transitions and microcrack opening and partial closure. (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. Pracoviště Ústav struktury a mechaniky hornin Kontakt Iva Švihálková, svihalkova@irsm.cas.cz, Tel.: 266 009 216 Rok sběru 2017
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