Thermal conductivity of silica refractories and its temperature dependence during thermal cycling, compared to silicite and sandstone

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F25%3A43931715" target="_blank" >RIV/60461373:22310/25:43931715 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.sciencedirect.com/science/article/pii/S2666539525000021" target="_blank" >https://www.sciencedirect.com/science/article/pii/S2666539525000021</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.oceram.2025.100735" target="_blank" >10.1016/j.oceram.2025.100735</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal conductivity of silica refractories and its temperature dependence during thermal cycling, compared to silicite and sandstone

Popis výsledku v původním jazyce

The thermophysical properties of silica refractories are important for their potential application as high-temperature thermal energy storage (HT-TES) media. In this paper, we report new measurements of thermal conductivity and thermal diffusivity by plane-source techniques and the laser-flash technique, respectively. The latter is also used to determine the temperature dependence of the thermal conductivity from room temperature to 800 ◦C during heating and cooling. It is shown that for a silica refractory with porosity 21 % the experimentally measured thermal conductivity (1.3–1.6 W/mK) is significantly lower than the analytical and numerical predictions for spherical, polyhedral and concave pores (3.1–4.7 W/mK), which indicates the influence of microcracks. The anomaly in the temperature dependence below ~200 ◦C can be attributed to the phase transitions of cristobalite and tridymite, but above this temperature the thermal conductivity increases, whereas that of silicite and sandstone decreases. Thermal cycling leads to microcrack-induced damage.

Název v anglickém jazyce

Thermal conductivity of silica refractories and its temperature dependence during thermal cycling, compared to silicite and sandstone

Popis výsledku anglicky

The thermophysical properties of silica refractories are important for their potential application as high-temperature thermal energy storage (HT-TES) media. In this paper, we report new measurements of thermal conductivity and thermal diffusivity by plane-source techniques and the laser-flash technique, respectively. The latter is also used to determine the temperature dependence of the thermal conductivity from room temperature to 800 ◦C during heating and cooling. It is shown that for a silica refractory with porosity 21 % the experimentally measured thermal conductivity (1.3–1.6 W/mK) is significantly lower than the analytical and numerical predictions for spherical, polyhedral and concave pores (3.1–4.7 W/mK), which indicates the influence of microcracks. The anomaly in the temperature dependence below ~200 ◦C can be attributed to the phase transitions of cristobalite and tridymite, but above this temperature the thermal conductivity increases, whereas that of silicite and sandstone decreases. Thermal cycling leads to microcrack-induced damage.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/EH22_008%2F0004631" target="_blank" >EH22_008/0004631: Materiály a technologie pro udržitelný rozvoj</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Open Ceramics

ISSN

2666-5395

e-ISSN

2666-5395

Svazek periodika

21

Číslo periodika v rámci svazku

March 2025

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

19

Strana od-do

100735

Kód UT WoS článku

001414665000001

EID výsledku v databázi Scopus

2-s2.0-85214875729