[Measurement Example] <Insulation substrate material for electronic circuits> Thermal conductivity of polyimide sheet
TA
Thermal conductivity distribution measurement and the anisotropy of thermal diffusivity in each part can be evaluated.
Here is an example of evaluating thin polyimide sheets. Polyimide sheets are resin materials primarily used as insulating substrates and insulating layers in electronic circuits. This time, we measured the thermal diffusivity in the thickness direction using a ThermoWave Analyzer TA on a sheet with a thickness of 7.5 μm. Even with the same polyimide sheet, there are significant thermal differences depending on the thickness. When comparing examples of 25 μm and 7.5 μm using the measure of thermal diffusion time, there is nearly a tenfold difference. The thinner sheet diffuses heat in one-tenth the time. For in-plane measurements, it is relatively easy to achieve time resolution since the distance between the heating point and the detection point can be established. However, for thickness direction measurements, it is necessary to detect rapid temperature changes, which affects the basic performance of the equipment. Traditional measurement methods make the measurement itself difficult. Additionally, at a thickness of 7.5 μm, the thermal effects of surface blackening treatment cannot be ignored, so we have devised methods to minimize these effects during sample preparation and measurement. The measurement results are as follows: Thermal diffusivity in the thickness direction: 0.103 × 10^-6 m²s^-1. This value is approximately 30% lower compared to the 25 μm thick polyimide.
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basic information
**Main Features** - Measurement of thermal diffusivity using a non-contact laser method - Evaluation from organic films to diamonds - Measurement of resin-based materials is also possible **Other Features** - For composite materials of fillers (such as AlN, SiO2, SiC, CNT, etc.) and resins, the thermal conductivity varies significantly with the mixing ratio, making the measurement of thermal diffusivity essential. - Measurement of resin-based materials is also possible → Graphite sheets → Polyimide sheets → Silicon-based thermal conductive sheets → Carbon-based materials → Other resin sheets ● For more details, please contact us.
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Applications/Examples of results
◇In-plane and thickness direction anisotropy ◇Distribution measurement ◇Thermal property evaluation of ultra-thin polyimide sheets
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Leveraging the assembly technology cultivated over many years, we have expanded our business areas to include the development of precision component assembly, thermal property measurement devices, contract measurement services, and the development of medical and dental plastic products equipped with clean rooms. We deepen and integrate our "original products" from a unique manufacturing perspective, consolidating our know-how and technology. With "speedy decision-making and execution," which is a strength unique to Bethel, we provide high-quality products under the "Made by BETHEL" label. Our wish at Bethel is for our customers who use Bethel products to be satisfied with our products, manufacturing, and services, and to feel that they made the right choice in trusting our company. Furthermore, we hope that the satisfaction of our customers will lead to the happiness of each employee who works here.