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Laser thermal conductivity meter LFA 427
Laser thermal conductivity meter LFA 427
Product details
For the description of thermal conductivity of materials or components, thermal conductivity and thermal diffusion coefficient are the most important thermal property parameters. Laser flash method is the most widely used method in the field of thermal conductivity testing, used to accurately measure the thermal diffusion coefficient of materials and calculate their thermal conductivity. The laser thermal conductivity meter LFA 427 launched by Nike represents the highest level of similar products worldwide.
LFA 427 has outstanding advantages such as high precision, high repeatability, fast measurement, diverse sample holder types, and freely adjustable testing atmosphere. Its total measurement temperature range is -120 ° C 2800 ° C.
LFA 427 has recently launched a special configuration version with a pyrometer, which can measure over a wide temperature range from room temperature to 2800 ° C.
The sample of LFA 427 has a wide range of applications, including ceramics, glass, metals, melts, liquids, powders, fibers, and multilayer materials. From low thermal conductivity materials to diamond with the highest thermal conductivity, measurements can be taken at the same speed and accuracy. The instrument directly tests the thermal diffusion coefficient that varies with temperature, and when combined with the specific heat value (usually using DSC 404 F1 Pegasus)®The thermal conductivity can be further calculated by comparing the density (measured and calculated using a DIL 402 Expedia thermal expansion instrument as a function of temperature) with the LFA 427.
The laser energy, pulse width, atmosphere, and vacuum used for measurement can be freely selected, and the optimal measurement conditions can be set for different sample properties.
This instrument has a completely sealed system and is designed to save space. Its safety level has reached the highest level (Level 1), and no special safety measures are required during operation. The software features advanced functionality, allowing the instrument to operate in manual or fully automatic mode. And provide special brackets for testing powder, liquid, slag, fiber, and interlayer samples.
LFA 427 is the most powerful and flexible LFA system, suitable for characterizing conventional materials and new high-performance materials in various fields including automotive manufacturing, aerospace, and energy technology.
LFA 427 has outstanding advantages such as high precision, high repeatability, fast measurement, diverse sample holder types, and freely adjustable testing atmosphere. Its total measurement temperature range is -120 ° C 2800 ° C.
LFA 427 has recently launched a special configuration version with a pyrometer, which can measure over a wide temperature range from room temperature to 2800 ° C.
The sample of LFA 427 has a wide range of applications, including ceramics, glass, metals, melts, liquids, powders, fibers, and multilayer materials. From low thermal conductivity materials to diamond with the highest thermal conductivity, measurements can be taken at the same speed and accuracy. The instrument directly tests the thermal diffusion coefficient that varies with temperature, and when combined with the specific heat value (usually using DSC 404 F1 Pegasus)®The thermal conductivity can be further calculated by comparing the density (measured and calculated using a DIL 402 Expedia thermal expansion instrument as a function of temperature) with the LFA 427.
The laser energy, pulse width, atmosphere, and vacuum used for measurement can be freely selected, and the optimal measurement conditions can be set for different sample properties.
This instrument has a completely sealed system and is designed to save space. Its safety level has reached the highest level (Level 1), and no special safety measures are required during operation. The software features advanced functionality, allowing the instrument to operate in manual or fully automatic mode. And provide special brackets for testing powder, liquid, slag, fiber, and interlayer samples.
LFA 427 is the most powerful and flexible LFA system, suitable for characterizing conventional materials and new high-performance materials in various fields including automotive manufacturing, aerospace, and energy technology.
LFA 427- Technical Parameters
• Temperature range:- 120... 2800 ° C (different furnace bodies)
• Laser source: Nd: Glass laser, adjustable energy
• Thermal conductivity: 0.1 2000W/mK
• Vacuum degree: 10-5 mbar
Sample size: Square 8 x 8mm, 10 x 10mm Round Ø 6mm, Ø 10mm, Ø 12.7mm, Ø 20mm Thickness 0.1... 6mm
Test atmosphere: vacuum, inert or reactive gas
• Bracket types: graphite, alumina, silicon carbide
• Sample form: solid, liquid, powder, film
LFA 427- Software Features
The measurement and analysis software of LFA 427 is based on Microsoft Windows®Proteus of the system®The software package includes all necessary measurement and data analysis functions. This software package has an extremely user-friendly interface, including easy to understand menu operations and automated workflows, and is suitable for various complex analyses. Proteus software can be installed on the control computer of the instrument for online operation, or installed on other computers for offline use.
LFA software features:
Accurate pulse width correction and pulse energy integration.
Heat loss correction.
Integrated all traditional models.
Use non-linear regression for Cowan fitting.
The improved Cape Lehmann model incorporates multidimensional heat loss into the calculation using nonlinear regression.
Radiation correction for semi transparent samples.
Two layer and three-layer structural samples: Fit through nonlinear regression and include heat loss in the calculation.
Calculate the contact thermal resistance of multi-layer samples.
Specific heat measurement: using a standard sample with known specific heat and calculating through comparative methods.
Built in database.
LFA 427- Related Attachments
LFA 427 is equipped with a constant temperature water bath to ensure stability in temperature and long-term operation.
Various types of vacuum pumps, including turbo molecular pumps, can enable testing to be conducted in high vacuum or pure oxygen free inert atmospheres.
Flow meter, used to regulate the flow rate of purge gas.
Sample holder and cover made of aluminum, SiC, or graphite, suitable for standard sample sizes.
Provide various types and sizes of sample holders or containers made of materials such as alumina, platinum, aluminum, sapphire, etc., for measuring special samples such as liquid samples, molten metals, slag, and fibers.
Provide standard samples for verifying the thermal diffusivity coefficient.
Provide reference samples for specific heat testing.
Sample preparation equipment.
• Temperature range:- 120... 2800 ° C (different furnace bodies)
• Laser source: Nd: Glass laser, adjustable energy
• Thermal conductivity: 0.1 2000W/mK
• Vacuum degree: 10-5 mbar
Sample size: Square 8 x 8mm, 10 x 10mm Round Ø 6mm, Ø 10mm, Ø 12.7mm, Ø 20mm Thickness 0.1... 6mm
Test atmosphere: vacuum, inert or reactive gas
• Bracket types: graphite, alumina, silicon carbide
• Sample form: solid, liquid, powder, film
LFA 427- Software Features
The measurement and analysis software of LFA 427 is based on Microsoft Windows®Proteus of the system®The software package includes all necessary measurement and data analysis functions. This software package has an extremely user-friendly interface, including easy to understand menu operations and automated workflows, and is suitable for various complex analyses. Proteus software can be installed on the control computer of the instrument for online operation, or installed on other computers for offline use.
LFA software features:
Accurate pulse width correction and pulse energy integration.
Heat loss correction.
Integrated all traditional models.
Use non-linear regression for Cowan fitting.
The improved Cape Lehmann model incorporates multidimensional heat loss into the calculation using nonlinear regression.
Radiation correction for semi transparent samples.
Two layer and three-layer structural samples: Fit through nonlinear regression and include heat loss in the calculation.
Calculate the contact thermal resistance of multi-layer samples.
Specific heat measurement: using a standard sample with known specific heat and calculating through comparative methods.
Built in database.
LFA 427- Application Examples
Bio alumina
The figure shows the LFA thermal diffusion coefficient test results for a Bio alumina sample coated with graphite on a certain surface. The measurement results obtained from two different laboratories (KfK x Research Center Karlsruhe, IMF1 and LFA 427+NETZSCH Applications laboratory) are highly consistent.
Bio alumina
The figure shows the LFA thermal diffusion coefficient test results for a Bio alumina sample coated with graphite on a certain surface. The measurement results obtained from two different laboratories (KfK x Research Center Karlsruhe, IMF1 and LFA 427+NETZSCH Applications laboratory) are highly consistent.
Pure copper
The thermal diffusion coefficient of pure copper was tested under heating and cooling conditions in the figure. The sudden change in thermal diffusion coefficient at around 1080 ° C is caused by the melting/solidification of the material. Due to the almost negligible difference in the thermal diffusion coefficient measured under both heating and cooling methods, it indicates that the material did not undergo significant microstructural changes after heating and cooling cycles. The deviation between the measured values of thermal diffusion coefficients in the solid and liquid phase regions and the literature values is less than 2.5%. The temperature correction of LFA instruments can be achieved by utilizing the sudden change in the thermal diffusion coefficient of metals at their melting point (pure copper melting point is 1083 ° C).
The thermal diffusion coefficient of pure copper was tested under heating and cooling conditions in the figure. The sudden change in thermal diffusion coefficient at around 1080 ° C is caused by the melting/solidification of the material. Due to the almost negligible difference in the thermal diffusion coefficient measured under both heating and cooling methods, it indicates that the material did not undergo significant microstructural changes after heating and cooling cycles. The deviation between the measured values of thermal diffusion coefficients in the solid and liquid phase regions and the literature values is less than 2.5%. The temperature correction of LFA instruments can be achieved by utilizing the sudden change in the thermal diffusion coefficient of metals at their melting point (pure copper melting point is 1083 ° C).
LFA 427- Related Attachments
LFA 427 is equipped with a constant temperature water bath to ensure stability in temperature and long-term operation.
Various types of vacuum pumps, including turbo molecular pumps, can enable testing to be conducted in high vacuum or pure oxygen free inert atmospheres.
Flow meter, used to regulate the flow rate of purge gas.
Sample holder and cover made of aluminum, SiC, or graphite, suitable for standard sample sizes.
Provide various types and sizes of sample holders or containers made of materials such as alumina, platinum, aluminum, sapphire, etc., for measuring special samples such as liquid samples, molten metals, slag, and fibers.
Provide standard samples for verifying the thermal diffusivity coefficient.
Provide reference samples for specific heat testing.
Sample preparation equipment.
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