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Laser Flash technique over the broadest temperature range

Thermal conductivity and Thermal DiffusivityThermal diffusivity (a with the unit mm2/s) is a material-specific property for characterizing unsteady heat conduction. This value describes how quickly a material reacts to a change in temperature.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 DiffusivityThermal diffusivity (a with the unit mm2/s) is a material-specific property for characterizing unsteady heat conduction. This value describes how quickly a material reacts to a change in temperature.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 ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.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 DiffusivityThermal diffusivity (a with the unit mm2/s) is a material-specific property for characterizing unsteady heat conduction. This value describes how quickly a material reacts to a change in temperature.thermal diffusivity value along with the corresponding specific heat (DSC 404 F1 Pegasus^®) and DensityThe mass density is defined as the ratio between mass and volume. density (DIL 402 C) data are used to calculate the Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.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.

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Technical Data

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

25 J/pulse, (adjustable power and pulse duration)

Tablet displaying a cover on thermal analysis and rheology in polymer additive manufacturing, emphasizing key techniques.

Contactless measurement of temperature rise
with IR detector

Measuring range:
0.01 mm²/s to 1000 mm²/s
(Thermal DiffusivityThermal diffusivity (a with the unit mm2/s) is a material-specific property for characterizing unsteady heat conduction. This value describes how quickly a material reacts to a change in temperature.thermal diffusivity)

Measuring range:
0.1 W/mK to 2000 W/mK
(Thermal ConductivityThermal conductivity (λ with the unit W/(m•K)) describes the transport of energy – in the form of heat – through a body of mass as the result of a temperature gradient (see fig. 1). According to the second law of thermodynamics, heat always flows in the direction of the lower temperature.thermal conductivity)

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:
Al₂O₃, graphite

Liquid metal holder:
sapphire

Sample holder for liquids:
platinum

Atmospheres:
inert, oxidizing, reducing, static, dynamic

High vacuum-tight assembly
up to 10^-5 mbar

NETZSCH LFA 427 Laser Flash Analysis unit with P8 control module, designed for advanced thermal conductivity testing.

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Exploded view diagram of a laser flash analysis setup, featuring components like a sample tube, cap, and thermocouple.

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Along with the reliability of the LFA instruments, the excellent customer support provided by NETZSCH-Gerätebau GmbH has been decisive in this long-year collaboration. The long-term availability of spare parts has been just as important as the excellent and always available on-site service, along with the option for comprehensive maintenance of the systems directly at NETZSCH-Gerätebau GmbH in Selb.

Dr. Andreas Cziegler

Research Assistant in the Physics Laboratory and Simulation Group at ÖGI

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.

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 ResistanceAccording to the second law of thermodynamics, heat transfer between two systems always moves in the direction from higher to lower temperatures. The amount of thermal energy transferred by heat conduction, e.g., through a wall of a building, is influenced by the thermal resistances of the concrete wall and the insulation layer.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

NETZSCH LFA Windows® Software interface showing thermal analysis graphs and data for laser flash analysis testing. — user surface of NETZSCH LFA Windows® Software

You can use the following software with this product

Proteus^® for Thermal Analyzers

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 DiffusivityThermal diffusivity (a with the unit mm2/s) is a material-specific property for characterizing unsteady heat conduction. This value describes how quickly a material reacts to a change in temperature.thermal diffusivity
Reference samples for specific heat
Sample preparation machines