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Thermal Expansion Measurements of Insulative Materials and the Effect of the TMA Furnace Thermal Gradient

From Trace Laboratories, Inc.
 

 

The Thermomechanical Analyzer (TMA) has long been the standard means of measuring the Coefficient of Thermal Expansion (CTE) of materials. In previous work, we have demonstrated that a significant vertical thermal gradient exists within the TMA furnace when testing materials of low thermal conductivity. The thermal gradient was measured to be approximately 2.5 to 3oC per millimeter. This paper studies the impact of this thermal gradient on thermal expansion measurements of materials with varying thermal conductivity characteristics and thickness. The TMA instrument thermocouple location versus sample thickness was varied for each material type and the variation in the coefficient of thermal expansion was determined.

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