Young’s modulus of silicon carbide refractories and its temperature dependence after up to 250 firing cycles determined via impulse excitation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F22%3A43925126" target="_blank" >RIV/60461373:22310/22:43925126 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Young’s modulus of silicon carbide refractories and its temperature dependence after up to 250 firing cycles determined via impulse excitation

Popis výsledku v původním jazyce

The temperature dependence of elastic properties provides fundamental information on the high-temperature performance of refractories. In this work, the temperature dependence of Young’s modulus is determined via impulse excitation for commercial silicon carbide (SiC) refractories after up to 250 firing cycles (1000 h at 1600 °C in a gas-fired industry kiln). It is found that the Young modulus of as-supplied SiC decreases from 272–281 GPa at 25 °C to 250–262 GPa at 1500 °C during heating but recovers during cooling. After 67–126 firing cycles in air at 1600 °C the room temperature values of Young’s modulus are as low as 234–260 GPa, due to the presence of cristobalite (SiO2). During heating, Young’s modulus exhibits a steep increase at 210 °C to values of 250–275 GPa at around 400 °C, followed by a slight decrease during further heating. During cooling a steep decrease occurs at 200 °C, due to the re-opening of microcracks (phase transition of cristobalite). The oxidation layers passivate the material against further oxidation, so that even after 250 firing cycles the samples still exhibit full shape integrity and Young’s modulus values of 230 GPa at 25 °C and 250 GPa at 400 °C, followed by the typical slight decrease towards 240 GPa at 1500 °C.

Název v anglickém jazyce

Young’s modulus of silicon carbide refractories and its temperature dependence after up to 250 firing cycles determined via impulse excitation

Popis výsledku anglicky

The temperature dependence of elastic properties provides fundamental information on the high-temperature performance of refractories. In this work, the temperature dependence of Young’s modulus is determined via impulse excitation for commercial silicon carbide (SiC) refractories after up to 250 firing cycles (1000 h at 1600 °C in a gas-fired industry kiln). It is found that the Young modulus of as-supplied SiC decreases from 272–281 GPa at 25 °C to 250–262 GPa at 1500 °C during heating but recovers during cooling. After 67–126 firing cycles in air at 1600 °C the room temperature values of Young’s modulus are as low as 234–260 GPa, due to the presence of cristobalite (SiO2). During heating, Young’s modulus exhibits a steep increase at 210 °C to values of 250–275 GPa at around 400 °C, followed by a slight decrease during further heating. During cooling a steep decrease occurs at 200 °C, due to the re-opening of microcracks (phase transition of cristobalite). The oxidation layers passivate the material against further oxidation, so that even after 250 firing cycles the samples still exhibit full shape integrity and Young’s modulus values of 230 GPa at 25 °C and 250 GPa at 400 °C, followed by the typical slight decrease towards 240 GPa at 1500 °C.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/GA22-25562S" target="_blank" >GA22-25562S: Impulzní excitace jako nekonvenční metoda k monitorování fázových přeměn a mikrostrukturních změn během tepelného zatížení materiálů</a><br>

Návaznosti

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

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název statě ve sborníku

Sborník přednášek Hutní keramika 2022

ISBN

978-80-88365-04-4

ISSN

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e-ISSN

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Počet stran výsledku

7

Strana od-do

"92–98"

Název nakladatele

Tanger s.r.o.

Místo vydání

Ostrava

Místo konání akce

Rožnov pod Radhoštěm

Datum konání akce

4. 10. 2022

Typ akce podle státní příslušnosti

CST - Celostátní akce

Kód UT WoS článku

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