Testing method and application of thermal conductivity of paste materials

Paste materials (such as thermal conductive silicone grease, phase change materials, paste like building insulation materials, etc.) are widely used in fields such as electronic heat dissipation, building energy conservation, and new energy due to their unique rheological properties and interface adaptability. Accurately measuring its thermal conductivity is of great significance for product development, performance evaluation, and engineering applications. However, the special semi-solid characteristics of paste materials, such as easy flow, deformation, and high contact thermal resistance, pose challenges to testing. This article will systematically introduce the thermal conductivity testing method applicable to paste materials.

1、 Experimental steps

1. Experimental equipment

DZDR-S Thermal Conductivity Tester

2. Measurement method

The transient heat source method has the advantage of a wide measurement range, not limited to a certain form, and can measure liquids, solids, metals, alloys, pastes, colloids, films, etc; Fast measurement speed, able to produce results within 5-160 seconds, greatly improving the efficiency of experiments.

3. Preparation work

Sample preparation: One paste testing container, clean it in advance.

4. Experimental steps

4.1 Equipment calibration: Before the experiment begins, the thermal conductivity meter needs to be calibrated to ensure the accuracy of the test results. The calibration steps include coefficient calibration to ensure that the instrument can stably and accurately record data during the testing process.

4.2 First, place the probe in the middle of the paste container (as shown in the figure below), fix it, pour in the paste sample, cover it, and then adjust the software parameters such as time (160), probe, power, and reference according to the instructions.

4.3 Conduct software data collection, fill in power and probe resistance for thermal conductivity calculation, and obtain accurate data results. Then perform two parallel verifications of the repeatability of the results, as shown in the following figure.

4.4 Analysis of Measurement Results

Di test result: 0.990744

Second test result: 0.987273

Third test result: 0.983609

The repeatability of the three test results is good, and the results are relatively parallel. The thermal conductivity of the paste sample tested this time has reliable experimental basis.

2、 Measurement Conclusion

The DZDR-S thermal conductivity tester can measure a wide range of material types, including solids, liquids, colloids, pastes, films, etc. It is particularly suitable for characterizing the thermal properties of non solid materials such as pastes. The instrument is equipped with a specialized container for measuring paste, which effectively solves the testing difficulties caused by the special morphology of paste materials, such as viscosity and non-uniformity. By using a thermal conductivity tester to confirm the thermal conductivity of the paste sample, one can intuitively understand its thermal conductivity performance and determine whether it meets relevant quality standards and requirements.