Fascinating Flexibility in Thermal Analysis

DSC 404 F1 Pegasus® - High-Temperature DSC

 

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Accuracy of specific heat determination of alumina (Al₂O₃)
Presented in the figure is a specific heat test result for a polycrystalline alumina sample between room temperature and 1600°C. Additionally shown are literature values for pure alumina. It can clearly be seen that there are no significant differences between the literature values and the test results. The maximum deviations are in the range of 2%, which demonstrates the outstanding performance of the DSC 404 F1 Pegasus®.

Specific heat of volcanic rock
Natural materials such as rocks are difficult to analyze with regard to their chemical composition. Such materials are generally a mixture of different oxides, sulfates or carbonates. Volcanic rocks are generally solidified from molten magma and their main contents are different oxides. This example shows a DSC measurement result for such a material. It can clearly be seen that it solidified almost completely amorphous. The glass transition was between 623°C and 655°C. Cold crystallization and melting were detected at 884°C and 1111°C (peak temperature). The heat released during crystallization was comparable to the heat of fusion, indicating the highly amorphous nature of this mixture.

Phase transitions in an SAE 107 steel material
Presented here are the transformation energetics of a steel (SAE 107). At 751°C, two phase transitions overlap each other. The increase in the heat flow rate up to 735°C is due to the Curie transition (change in the magnetic properties). A change in the crystal structure (bcc to fcc structure) is causing the major peak. The structural change is connected with an enthalpy change of 63 J/g. Melting was seen at 1367°C and occurred in two steps (peaks at 1395°C and 1471°C). The heat of fusion was 268 J/g.

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