Development of stress on quartz grain in illite ceramics during cooling stage of firing

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F20%3A00341174" target="_blank" >RIV/68407700:21110/20:00341174 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.2109/jcersj2.19169" target="_blank" >https://doi.org/10.2109/jcersj2.19169</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2109/jcersj2.19169" target="_blank" >10.2109/jcersj2.19169</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Development of stress on quartz grain in illite ceramics during cooling stage of firing

Popis výsledku v původním jazyce

If the volume fraction of quartz in traditional ceramics is higher than 10% then the use of Selsing’s formula is questionable. A model of two concentric spheres, in which the inner sphere is a quartz grain and its spherical cladding is glassy phase, is proposed. The development of the stress on the grain surface during cooling stage of the firing and its influence on the microcracking is described. The tensile tangential stress which is developed between the glass transformation temperature and beta -> alfa transition of quartz can be a source of the first microcracking. After this transition, the tangential stress becomes compressive. The radial stress on the grain surface, which is compressive before the beta -> alfa transition of quartz, turns into tensile after this transition as a steep change of 4080MPa (for 1050% of quartz content). These changes are in a narrow temperature interval around the beta -> alfa transition of quartz passing through zero value and no cracks are expected. This is confirmed with acoustic emission (AE) and short recovery of Young’s modulus. When the beta -> alfa transition of quartz is finished and the temperature decreases, the creation of the cracks continues. The radial tensile stress on the grain and in its close vicinity reaches 100180MPa, consequently, circumferential cracks can be formed. This is indirectly confirmed with a decrease of Young’s modulus and weak AE activity.

Název v anglickém jazyce

Development of stress on quartz grain in illite ceramics during cooling stage of firing

Popis výsledku anglicky

If the volume fraction of quartz in traditional ceramics is higher than 10% then the use of Selsing’s formula is questionable. A model of two concentric spheres, in which the inner sphere is a quartz grain and its spherical cladding is glassy phase, is proposed. The development of the stress on the grain surface during cooling stage of the firing and its influence on the microcracking is described. The tensile tangential stress which is developed between the glass transformation temperature and beta -> alfa transition of quartz can be a source of the first microcracking. After this transition, the tangential stress becomes compressive. The radial stress on the grain surface, which is compressive before the beta -> alfa transition of quartz, turns into tensile after this transition as a steep change of 4080MPa (for 1050% of quartz content). These changes are in a narrow temperature interval around the beta -> alfa transition of quartz passing through zero value and no cracks are expected. This is confirmed with acoustic emission (AE) and short recovery of Young’s modulus. When the beta -> alfa transition of quartz is finished and the temperature decreases, the creation of the cracks continues. The radial tensile stress on the grain and in its close vicinity reaches 100180MPa, consequently, circumferential cracks can be formed. This is indirectly confirmed with a decrease of Young’s modulus and weak AE activity.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Journal of the Ceramic Society of Japan

ISSN

1882-0743

e-ISSN

1348-6535

Svazek periodika

128

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

JP - Japonsko

Počet stran výsledku

7

Strana od-do

117-123

Kód UT WoS článku

000516765300002

EID výsledku v databázi Scopus

2-s2.0-85081727688