Effect of the temperature dependence of thermal properties on the thermal shock tests of ceramics

Thermal stress generated during thermal shock is closely related to the fracture of ceramics. An attempt was made to determine thermal stress in a specimen by numerical calculation. The temperature dependence of thermal conductivity and diffusivity were introduced to represent practical thermal cond...

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Bibliographic Details
Published in:Journal of materials science 1995-10, Vol.30 (19), p.5013-5019
Main Authors: NISHIKAWA, T, MIZUI, T, TAKATSU, M, MIZUTANI, Y
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
General studies
Technical ceramics
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Summary:Thermal stress generated during thermal shock is closely related to the fracture of ceramics. An attempt was made to determine thermal stress in a specimen by numerical calculation. The temperature dependence of thermal conductivity and diffusivity were introduced to represent practical thermal conditions. The maximum thermal stress was recognised at the Fourier number but differed from the temperature dependence. Correlative equations under cooling or heating tests have been proposed. The thermal shock resistance parameter was expressed by the equations to suggest adequate experimental conditions and specimen size. A comparison of the measured and calculated time to failure of the specimen led to confirmation of the fracture criterion. The measured time disagreed with the calculated one if fracture by thermal shocking was not predominant. The correlative equations were also useful to select the kind of ceramics subjected to thermal shocking. 9 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01154516