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

Result code in 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>
Alternative codes found
RIV/67985891:_____/16:00450816 RIV/00216224:14310/16:00087600
Result on the web
<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>

Result language
angličtina
Original language name
High-temperature Young's moduli and dilatation behavior of silica refractories
Original language description
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.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JH - Ceramics, fire-proof materials and glass
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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