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LFA 1000

High performance Laser Flash measurements

Description

On point

Information of the thermo-physical properties of materials and heat transfer optimization of final products is becoming more and more vital for industrial applications. Over the past few decades, the flash method has developed into the most commonly used technique for the measurement of the thermal diffusivity and thermal conductivity of various kinds of solids, powders and liquids.

The Linseis LFA 1000 Laser Flash is the most modular and precise Instrument for the determination of Thermal Diffusivity, Conductivity and Specific Heat Values. Its sample robot for up to 3, 6 or 18 Samples at the same time allows unbeaten turnaround times. The three user exchangeable furnaces allow measurements from -125 up to 2800 °C.

A number of different sample holders for applications such as solids, liquids, melts and slags are available. The compact design allows the separation of hardware and electronics as well as the installation under a hood for nuclear applications.

LFA 1000 Querschnitt

LFA 1000 – cross section

 

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Specifications

Model LFA 1000
Temperature range: -125 °C/ -100 °C up to 500°C
RT up to 1250°C
RT up to 1600°C
Pulse source Nd: Ng:YAG Laser 25 J/Puls
Measurement of temp. rise: Contact less with IR detector (InSb or MCT)
Measuring range th. diffusivity: 0.01 mm2/s … 1000 mm2/s
Measuring range th. conductivity: 0.1 W/mk … 2000 W/mK
Sample dimensions: ∅ 3, 6, 10, 12.7 … 25.4 mm,
square samples 10×10 or 20x 20 mm
Sample Thickness: 0.1 mm … 6 mm
Nr. of Samples: Sample robot for up to 3, 6, or 18 samples
Sample holder: metal/SiC/Graphite
Sample holder for liquids: available
Atmospheres: inert, oxidizing, reducing, vacuum
Electronics: Integrated
Data acquisition: 2 MHz
Interface: USB
Model LFA 2000
Temperature range: RT up to 2000°C
RT up to 2400°C
RT up to 2800°C
Pulse source Nd: Ng:YAG Laser 25 J/pulse
Measurement of temp. rise: Contact less with IR detector (InSb or MCT)
Measuring range th. diffusivity: 0.01 mm2/s … 1000 mm2/s
Measuring range th. conductivity: 0.1 W/mk … 2000 W/mK
Sample dimensions: ∅ 6, 10, 12.7 … 25.4 mm
Sample Thickness: 0.1 mm … 6 mm
Nr. of Samples: Sample robot for up to 3 samples
Sample holder: metal/SiC/Graphite
Sample holder for liquids: available
Atmospheres: inert, oxidizing, reducing, vacuum
Electronics: Integrated
Data acquisition: 2 MHz
Interface: USB

Software

All thermo analytical devices of LINSEIS are PC controlled, the individual software modules exclusively run under Microsoft® Windows® operating systems. The complete software consists of 3 modules: temperature control, data acquisition and data evaluation. The Linseis 32 – bit software encounters all essential features for measurement preparation, execution and evaluation, just like with other thermo analytical experiments.

LFA Features

  • Precise pulse length correction, pulse mapping
  • Heat-loss corrections
  • Analysis of 2- or 3-layers systems
  • Wizard for selection of the perfect evaluation model
  • Specific heat determination
  • Contact resistance determination in multi-layer systems

Evaluation Software

  • Automatic or manual input of related measurement data (density, specific heat)
  • Model wizard for selection of the appropriate model
  • Finite pulse correction
  • Heat loss correction
  • Multilayer model
  • Determination of contact resistance
  • Cp (Specific Heat) determination by comparative method

Measurement Software

  • Easy and user-friendly data input for temperature segments, gases etc.
  • Controllable sample robot
  • Software automatically displays corrected measurements after the energy pulse
  • Fully automated measurement procedure for multi sample measurements

Applications

Application example: Thermal diffusivity of glass ceramic

Pyroceram, a glass ceramic trademark of Corning used as a standard material in various applications, has been measured using the LFA 1000 to show the reproducibility of thermal diffusivity values. In total 18 measurements were performed with 18 samples that were cut out of one bulk block. Each sample was measured separately and the result shows a spread in the result that is in a range of +/- 1 % in a temperature range up to 1250°C.

Thermal diffusivity of glass ceramic

Application example: Thermal conductivity of graphite

A graphite sample has been investigated using the LFA 1000. Thermal diffusivity has been determined directly at several temperature between RT and 1600°C. Specific heat capacity has been determined using a known graphite standard in a second sample position as a reference in the same measurement. The product out of diffusivity, specific heat and density gives the corresponding thermal conductivity. The result shows a linear decreasing thermal conductivity which is typical and a thermal diffusivity that is showing a plateau above 500°C. The Cp is slightly increasing over temperature.

Thermal conductivity of graphite

Application example: Influence of sample thickness on thermal conductivity accuracy of LFA 1000

The accuracy of thermal conductivity values depending on sample thickness was investigated using a silver standard. To get an idea which sample thickness is ideal for the laser flash method, silver samples with different thickness were measured at room temperature. The thermal conductivity was calculated out of thermal diffusivity, density and heat capacity. The scheme shows that the accuracy (deviation from literature value) grows exponential the smaller the diameter gets. The limit for an accurate value is around 200 micrometers. Below that “barrier” the values are dramatically different. However this is not only because of the limitations of the method, but also due to the fact that thin layers show different behavior like bulk materials what can be investigated using the THIN FILM LFA or other thin film techniques.

Influence of sample thickness on thermal conductivity accuracy of LFA 1000

Video

Downloads

Overview

Laser Flash Analysis 1000 Product brochure (PDF)

Laser Flash Analysis 1000
Product
brochure (PDF)

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Laser Flash Analysis 1000/2000 Product brochure (PDF)

Laser Flash Analysis 1000/2000
Product
brochure (PDF)

Download