High-temperature Young's moduli and dilatation behavior of silica refractories

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F16%3A43901941" target="_blank" >RIV/60461373:22310/16:43901941 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985891:_____/16:00450816 RIV/00216224:14310/16:00087600

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.jeurceramsoc.2015.09.020" target="_blank" >http://dx.doi.org/10.1016/j.jeurceramsoc.2015.09.020</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jeurceramsoc.2015.09.020" target="_blank" >10.1016/j.jeurceramsoc.2015.09.020</a>

Jazyk výsledku

angličtina

Název v původním jazyce

High-temperature Young's moduli and dilatation behavior of silica refractories

Popis výsledku v původním jazyce

Silica refractories with cristobalite-tridymite ratios between 0.83-0.86 and 1.43-1.47 and porosities of 13-17 % are characterized by impulse excitation up to 1200 oC and by dilatometry up to 1300 oC. During heating, Young's moduli start to decrease from their room temperature values (9-12 GPa) to about 5-7 GPa at 200 oC, followed by a very steep increase at around 230 oC to values higher than the room temperature values and a nonlinear increase to their final high-temperature values. During cooling, Young's moduli increase even further, exhibit a maximum and a nonlinear decrease that does not follow the heating curve, a very steep decrease at around 200 oC and a final increase to the intial room temperature values, so that a closed loop results during thermal cycling. Dilatometric measurements confirm that the strong increase of the Young's modulus at around 230 oC (during heating) can be attributed to the phase transition between low- and high-temperature cristobalite, while the more gentle - but still very significant - changes in Young's moduli below 200 oC are due to the more diffuse transitions between tridymite subpolymorphs. Microcracks are identified as the primary cause of the low Young's moduli and their increase with temperature.

Název v anglickém jazyce

High-temperature Young's moduli and dilatation behavior of silica refractories

Popis výsledku anglicky

Silica refractories with cristobalite-tridymite ratios between 0.83-0.86 and 1.43-1.47 and porosities of 13-17 % are characterized by impulse excitation up to 1200 oC and by dilatometry up to 1300 oC. During heating, Young's moduli start to decrease from their room temperature values (9-12 GPa) to about 5-7 GPa at 200 oC, followed by a very steep increase at around 230 oC to values higher than the room temperature values and a nonlinear increase to their final high-temperature values. During cooling, Young's moduli increase even further, exhibit a maximum and a nonlinear decrease that does not follow the heating curve, a very steep decrease at around 200 oC and a final increase to the intial room temperature values, so that a closed loop results during thermal cycling. Dilatometric measurements confirm that the strong increase of the Young's modulus at around 230 oC (during heating) can be attributed to the phase transition between low- and high-temperature cristobalite, while the more gentle - but still very significant - changes in Young's moduli below 200 oC are due to the more diffuse transitions between tridymite subpolymorphs. Microcracks are identified as the primary cause of the low Young's moduli and their increase with temperature.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

JH - Keramika, žáruvzdorné materiály a skla

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of the European Ceramic Society

ISSN

0955-2219

e-ISSN

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Svazek periodika

36

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

BE - Belgické království

Počet stran výsledku

12

Strana od-do

209-220

Kód UT WoS článku

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EID výsledku v databázi Scopus

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