Microstructure, elastic properties and high-temperature behavior of silica refractories
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F16%3A43902682" target="_blank" >RIV/60461373:22310/16:43902682 - isvavai.cz</a>
Alternative codes found
RIV/67985891:_____/16:00471704
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Microstructure, elastic properties and high-temperature behavior of silica refractories
Original language description
The microstructure, elastic properties and high-Temperature behavior of silica refractories are characterized by the Archimedes method, stereology-based image analysis, mercury porosimetry, dilatometiy and impulse excitation. Stereology-based image analysis and mercury porosimetry showed that the sample with lowest porosity (13.2 %) has the largest average cristobalite grain size (407 +- 44 ?m) and pore size (mode 17 ?m), whereas the samples with higher porosity (16.0-17.1 %) have smaller grain size (from 293 +- 43 to 298 +- 38 ?m) and pore size (mode 6 ?m). Moreover a small-size pore fraction (around 0.4 pm) is identified and attributed to microcracks. Room temperature elastic constants have been determined via impulse excitation from the resonant frequencies of flexural and anti-flexural vibrations of plate-shaped samples (Young's modulus 8.0-10.3 GPa, shear modulus 3.7-4.9 GPa, bulk modulus 3.1-3.8 GPa, Poisson ratio 0.053-0.086). Even after taking into account porosity via our exponential relation, the measured Young's moduli are smaller than the predicted ones by a factor of 4-5. This discrepancy is attributed to the presence of microcracks. The temperature dependence of the Young's modulus up to 1200 oC, measured by high-temperature impulse excitation from the flexural vibrations of bar-shaped samples, exhibits anomalies affected by the microstructure and related to the phase transitions between the low-And high-Temperature subpolymorphs of cristobalite and tridymite. These anomalies are closely related to the corresponding dilatational behavior.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
JH - Ceramics, fire-proof materials and glass
OECD FORD branch
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Result continuities
Project
<a href="/en/project/GA15-18513S" target="_blank" >GA15-18513S: Processing and characterization of oxide and silicate ceramics with controlled microstructure and modeling of microstructure-property relations</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
11th International Symposium on Ceramic Materials and Components for Energy and Environmental Applications
ISBN
978-1-119-23458-6
ISSN
1042-1122
e-ISSN
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Number of pages
12
Pages from-to
113-124
Publisher name
American Ceramic Society (ACerS)
Place of publication
Westerville, Ohio
Event location
Vancouver / Canada
Event date
Jun 14, 2015
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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