Thermal conductivity and thermal diffusivity are the most important thermophysical material parameters for characterizing the thermal transport properties of a material or component. The Laser Flash technique is currently the most widely accepted method for precise measurement of the thermal diffusivity and the LFA 427 is the number one instrument on the world market.
High precision and reproducibility, short measurement times, variable sample holders and defined atmospheres are outstanding features of LFA measurements over the entire application range from -120°C to 2800°C.
A special version with a pyrometer allows measurements from room temperature to 2800°C.
The thermal conductivity of disk-shaped samples of ceramic, glass, metals, melts and liquids, powders, fibers and multi-layer materials ranging from vacuum insulation panels to diamonds is measured with equal speed and accuracy. The temperature-dependent measured thermal diffusivity value along with the corresponding specific heat (DSC 404 F1 Pegasus®) and density (DIL 402 C) data are used to calculate the thermal conductivity.
The laser power, pulse width, gas and vacuum are variable over a wide range, making it possible to set the optimum measurement conditions for the very different sample properties.
The LFA 427 is the most powerful and versatile LFA system for research and development as well as all applications involving characterization of standard and high-performance materials in automobile manufacturing, aeronautics, astronautics and energy technology.
- Temperature range:
-120°C to 400°C, RT to 1300°C, RT to 1575°C, RT to 2000°C, RT to 2800°C
(5 furnace types)
- Heating- and cooling rates:
0.01 K/min to 50 K/min
(dependent on furnace)
- Laser power
(adjustable power and pulse duration)
- Contactless measurement of temperature rise
with IR detector
- Measuring range:
0.01 mm2/s to 1000 mm2/s
- Measuring range:
0.1 W/mK to 2000 W/mK
- Sample dimensions:
6 mm to 12.7 mm diameter (20 mm special version), 10x10 mm square
0.1 mm to 6 mm thickness
- Sample holder:
- Liquid metal holder:
- Sample holder for liquids:
inert, oxidizing, reducing, static, dynamic
- High vacuum-tight assembly
up to 10-5 mbar
The LFA 427 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.
- 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
You can use the following software with this product:
- The LFA 427 is equipped with a cooling thermostat to guarantee the greatest temperature and long-term stability.
- Various vacuum pumps, including turbomolecular pumps, enable measurements at reduced pressure, in high vacuum or in pure, oxygen-free atmospheres.
- Flow meter for purge gas
- Sample holders and caps made of aluminum, SiC and graphite for standard sample dimensions
- A number of sample holders made of alumina, platinum, aluminum and sapphire are available in various sizes for liquid samples, metal melts, slags and fibers.
- Reference samples for thermal diffusivity
- Reference samples for specific heat
- Sample preparation machines
Request a printed copy of the Accessories Catalogue
Determination of density change, specific heat and thermal diffusivity/conductivity prior to, during and after the sintering
published: DKG, 82 (2005) No. 10 E32
Basic theories and applications of different techniques for thermal diffusivity and thermal conductivity
published: Ceramic Industry, June (2002) 53
Dermination of thermal diffusivity of liquids, pastes and polymers by means of the laser flash technique
published: High Temperatures - High Pressures, 35/36 (2003/2007) 627
Application Note: The results of the measurement of the thermophysical properties of cast iron are presented.
A new technique for measuring the phononic thermal diffusivity of glasses by laser flash methods and temperatures between 300 and 1000K.
published in: High Temperatures - High Pressures, 29 (1997) 550