Estimation of Thermal Shock Resistance of Ceramics. (2nd Reprt. Heat Transfer Coefficient and Thermal Stress at Quenching in Liquid Sodium).

During thermal shock tests of porous materials by cooling media, the cooling media will infiltrate into the materials. Such as infiltration produces large effects on heattransfer coefficients on the specimen surface and temperature/stress distributions developed with in the specimen. In this paper, we performed thermal shock tests for porous ceramics using compressed air cooling and water flow cooling to estimate the infiltration effect on temperature/stress distributions. The heattransfer coefficients were estimated with a thermocouple implanted in a silver specimen. The temperature distributions in the porous specimens under thermal shock were measured using several thermocouples implanted in the specimens, and the temperature distributions were simulated using a transient heattransfer equation, taking into account of the infiltration of the cooling media into the specimen. Thermal stress distributions in the specimens were calculated from the estimated temperature distributions. The results revealed that the temperature distribution in a porous specimen changes drastically compared with a dense specimen, and the maximum thermal stress on the cooled surface of the porous specimen was smaller than that of a dense specimen. These phenomena express the reason why porous materials have high thermal shock resistance despite having small fracture strength.

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Estimation of Thermal Shock Resistance of Ceramics. (2nd Reprt. Heat Transfer Coefficient and Thermal Stress at Quenching in Liquid Sodium).

Cited by 3 publications

References 0 publications

An improved method for the determination of the maximum thermal stress induced during a quench test

An improved method for the determination of the maximum thermal stress induced during a quench test

Evaluation of Thermal Stresses Induced in Anisotropic Material During Thermal Shock

Thermal Stresses in Porous Materials under Thermal Shock by Cooling Medium-Infiltration Effect on Thermal Stress Distributions-

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