תיאור
State-of-the-art technology for thermophysical properties
The NETZSCH LFA 457 MicroFlash® complies with the latest technology for modern laser flash systems. The table-top instrument allows measurements from -125°C to 1100°C using two different user-exchangeable furnaces.
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.
The LFA 457 MicroFlash® is the most up-to-date and versatile LFA system for research and development and for all applications involving characterization of standard and high-performance materials in automobile manufacturing, aeronautics, astronautics and energy technology.
Key Technical Data
(subject to change)
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Temperature range:
-125°C to 500°C, RT to 1100°C, (2 exchangeable furnace types)
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Heating- and cooling rates:
0.01 K/min to 50 K/min
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Laser pulse energy:
up to 18 J/pulse, (adjustable power)
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Measuring range:
0.01 mm2/s to 1000 mm2/s (thermal diffusivity)
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Measuring range:
0.1 W/mK to 2000 W/mK (thermal conductivity)
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Sample dimensions:
10 mm to 25.4 mm diameter (also 8×8 mm and 10×10 mm, square) 0.1 mm to 6 mm thickness
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Sample holder: SiC, graphite
Liquid metal holder: sapphire
Sample holder for liquids: platinum
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Atmosphere:
inert, oxidizing, reducing, static, dynamic
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Vacuum-tight assembly
up to 10-2 mbar (1 Pa)
Software
The LFA 457 MicroFlash® runs under Proteus® Software on Windows®. The Proteus® Software includes everything you need to carry out a measurement and evaluate the resulting data. Through the combination of easy-to-understand menus and automated routines, a tool has been created that is extremely user-friendly and, at the same time, allows sophisticated analysis. The Proteus® Software is licensed with the instrument and can of course be installed on other computer systems.
LFA features:
- Accurate pulse length correction, pulse mapping
- Heat-loss corrections, all literature models are integrated
- Non-linear regression for Cowan fit
- Improved Cape-Lehmann model through consideration of multi-dimensional heat loss and non-linear regression
- Radiation correction for semi-transparent samples
- 2- or 3-layers systems: analysis by means of non-linear regression and consideration of heat loss
- Determination of contact resistance in multi-layer systems
- Model wizard for selecting the optimum evaluation model
- Determination of specific heat by means of a comparative method and standard samples
- Integrated databank
