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J. Korean Ceram. Soc. > Volume 49(4); 2012 > Article
Journal of the Korean Ceramic Society 2012;49(4): 385.
doi: https://doi.org/10.4191/kcers.2012.49.4.385
Thermal Shock Tests and Thermal Shock Parameters for Ceramics
Hideo Awaji, Seong-Min Choi1
King Mongkut's University of Technology Thonburi, Department Tool and Materials Engineering
1Fuji Electric Corporation of America
Thermal shock test methods and thermal shock parameters for ceramics were reviewed from the following viewpoints: (1) The test methods should be based on the precise estimation of both temperature and thermal stress distributions in a specimen taking into account the temperature-dependent thermo-mechanical properties; (2) The thermal shock parameters must be defined as a physical property of the materials and described as a function of temperature at the fracture point of the specimen; (3) The relation between the strength and fracture toughness of brittle ceramics under a thermal shock load must be the same as the relation under a mechanical load. In addition, appropriate thermal shock parameters should be defined by the thermal shock strength and thermal shock fracture toughness based on stress and energy criteria, respectively. A constant heat flux method is introduced as a testing technique suitable for estimating these thermal shock parameters directly from the electric power charged.
Key words: Thermal shock test, Thermal shock parameters, Brittle ceramics, Strength, Fracture toughness
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