ECE Testing Equipment
The innovative infrared sensor technology employed in the system enables measurement of the temperature increase on the back surface of the sample, even at temperatures of -125°C.
The instrument can be used for small and large sample sizes of up to 25.4 mm diameter and, with the integrated sample changer, measurements can be run on several samples at the same time.
The vacuum-tight design enables tests under defined atmospheres.
The vertical arrangement of the sample holder, furnace and detector simplifies sample placement and, at the same time, guarantees an optimum signal-to-noise ratio of the detector signal. Applications Polycrystalline Graphite Graphite materials are known to show a maximum thermal conductivity around room temperature, which can easily be analyzed using the low temperature version of the LFA 457 MicroFlash®. The physical explanation for this maximum is the high Debye temperature of this material (> 1000 K). The decrease in thermal diffusivity with increasing temperature dominates the temperature dependence of the thermal conductivity in the high temperature region. The specific heat decreases stronlgy at temperatures below room temperature and dominates the temperature dependence of the thermal conductivity there.
Polycarbonate Polycarbonate (PC) is a popular polymer material used among other things, for electric tool casings. To optimize the production/molding process by finite element simulations, the thermophysical properties have to be known. The thermal diffusivity can be determined not only in the solid region but also at temperatures above the glass transition (> 140°C) if a molten material cell is employed in the LFA 457 MicroFlash®. Together with the specific heat (measured with a DSC) and density data, the thermal conductivity can be determined. The silght increase in the thermal conductivity versus temperature is typical for 100% amorphous materials. Furthermore, the glass transition is visible in the specific heat curve and in the thermal diffusivity result. In the thermal conductivity result, this second order transition cannot be seen.
- Heating- and cooling rates: 0,01 K/min ... 50 K/min
- Laser power 15 J/pulse, (adjustable power)
- Contactless measurement of temperature rise with IR detector
- Measuring range: 0.01 mm2/s ... 1000 mm2/s (thermal diffusivity)
- Measuring range: 0.1 W/mK ... 2000 W/mK (thermal conductivity)
- Sample dimensions: 10 mm ... 25.4 mm diameter (also 8x8 mm and 10x10 mm, square) 0.1 mm ... 6 mm thickness
- Sample holder: SiC, graphite
- Liquid metal holder : sapphire
- Sample holder for liquids: platinum
- Atmosphere: inert, oxidizing, reducing, static, dynamic
- Vacuum-tight assembly up to 10-2 mbar (1 Pa)
Equipment is Located in C24 ERC. Please email eceshop@egr.msu.edu if you have any questions