ASTM C408-88 test method helps in determining the thermal conductivity of whiteware ceramics over the temperature range 100 to 300 °F (40 to 150 °C). The values stated in imperial units are to be regarded as standard.
Scope:
ASTM C408-88 test method provides information useful for understanding and quantifying parameters such as thermal shock resistance and the ability to conduct or dissipate heat.
Test Procedure:
The specimen is positioned in the apparatus and soldered to the thermodes. The system is closed and evacuated to 1 µm of mercury. The upper thermode is heated by a heater element, and a gradient is established along with the copper and along with the specimen. When the heat input equals the heat flowing down the thermode, steady-state conditions have been attained. After that, the emf of the four thermocouples is recorded.
Specimen size:
The ceramic test specimens used should be ground cylinders. The specimens should be formed using normal ceramic procedures of slip-casting, dry-pressing, or extrusion. The bases should be perpendicular to the axis of the cylinder. The length of the cylinder should be equal to its diameter.
Data:
Thermal conductivity of the Whiteware Ceramic is reported.
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