Article : [TRIAC087]

Info : REPONSE 113, le 04/02/2002.

Titre : Evaluation of thermal shock resistance of ceramics - temperature dependence of so-called heat transfer coefficient of quenching liquid.

Cité dans : [DIV333]  Recherche sur les mots clés thermal + shock + liquid , février 2002.

Source : Zairyo/Journal of the Society of Materials Science, Japan v 43 n 484
Jan 1994.p 89-94
CODEN : ZARYAQ
ISSN : 0514-5163
Année : 1994
Document_Type : Journal
Treatment_Code : Experimental
Language : Japanese
Stockage :

Abstract :
For evaluating the thermal shock resistance of ceramics precisely by
quenching test, one must know the heat transfer coefficient h between
quenching liquid and surface of specimen, when a critical temperature
difference Delta theta c is measured.However, few studies have been
devoted to quenching liquids applicable to thermal shock test of ceramics,
and the heat transfer coefficient is estimated from the Delta theta c
value when needed.In general, h in a quenching liquid exhibits a maximum
value in the temperature region where the heat transfer mode changes from
bubble boiling to transition stage.Therefore, it may be meaningless to
measure the Delta theta c value for some ceramics, which are fractured by
thermal stress near the region of maximum h.In this study, the temperature
changes at two different positions in the specimen were measured by using
various quenching liquids and the results were analyzed.The useful
so-called heat transfer coefficient for thermal shock test was obtained
from the temperature difference.On the basis of this method, the mixture
of mineral oil and butanol was proved to be a suitable quenching liquid
for thermal shock test, in which h did not show maximum in the usual
quenching temperature difference range of 150 to 450 degree C of
ceramics.(Author abstract) 6 Refs.

Accession_Number : 1995(1):419 COMPENDEX
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