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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

  • DOI - Digital Object Identifier

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

  • Czech description

Classification

  • Type

    D - Article in proceedings

  • CEP classification

    JH - Ceramics, fire-proof materials and glass

  • OECD FORD branch

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

  • 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