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

Result code in 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>

Result on the web

<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>

Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20504 - Ceramics

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

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

Name of the periodical

Journal of the Ceramic Society of Japan

ISSN

1882-0743

e-ISSN

1348-6535

Volume of the periodical

128

Issue of the periodical within the volume

3

Country of publishing house

JP - JAPAN

Number of pages

7

Pages from-to

117-123

UT code for WoS article

000516765300002

EID of the result in the Scopus database

2-s2.0-85081727688