Thermal conductivity analyzer (LFA 457 MicroFlash)

Brief introduction

NETZSCH LFA 457 MicroFlash ® This represents a new advancement in contemporary laser flash measurement technology. The instrument is desktop type, with a temperature range of -125 1100 ℃. To cover this temperature range, two freely switchable furnace bodies are provided.

The new infrared sensor technology used in the system allows users to even -125℃ Measure the temperature rise curve of the back of the sample at low temperatures.

The instrument can be used with a built-in automatic sample switcher to measure multiple smaller samples in one temperature rise, or it can measure larger samples separately (maximum diameter)25.4mm）.

The vacuum sealed system allows the instrument to measure in a variety of user selectable atmospheres.

The vertical arrangement of the sample holder, furnace body, and detector facilitates the placement and replacement of samples, while also providing the best signal-to-noise ratio for the detection signal.

LFA 457It is powerful and flexibleLFAThe system is suitable for characterizing conventional materials and new high-performance materials in various fields including automotive manufacturing, aerospace, and energy technology.

2、 Technical parameters

●Temperature range:-125 . .. 500℃，RT ... 1100℃(Using two freely replaceable furnace bodies)

●Heating and cooling rate:0.01 . .. 50 K/min

●Laser energy:18.5 J/pulse(Adjustable power)

●Non contact surface temperature rise signal testing of samples using infrared detectors

●Range of thermal diffusion coefficient:0.01 . .. 1000 mm2/s

●Thermal conductivity range:0.1 . .. 2000 W/m*K

●Sample diameter:10 . .. 25.4 mmCircle, or8×8give10×10mmFang.

●Sample thickness:0.1 . .. 6 mm

●Sample holder: Silicon carbide, graphite

●Molten metal container: Sapphire

●Liquid sample container: Platinum

●Atmosphere: Inert, Oxidation, Reduction, Static, Dynamic

●Vacuum sealed system, vacuum degree10-2mbar

3、 Software functions

LFA 457 MicroFlash ®The measurement and analysis software is based onMicroSoft Windows ®systemicProteus ®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.ProteusThe software can be installed on the control computer of the instrument to work online, or installed on other computers for offline use.

LFAPartial software functions:

●Accurate pulse width correction and pulse energy integration.

●Heat loss correction.

●Integrated all traditional models.

●Using non-linear regressionCowanFit.

●improvedCape-LehmannModel, using nonlinear regression to incorporate heat loss into the calculation.

●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.

4、 Related attachments

LFA 457 MicroFlash ®Equipped with a constant temperature water bath to ensure stability of temperature and long-term operation.

Provide multiple types of vacuum pumps to enable testing to be conducted in a vacuum or pure oxygen free inert atmosphere.

Flow meter, used to regulate the flow rate of purge gas.

causeSiCSample holder and cover made of graphite, suitable for standard sample sizes.

Provide various types and sizes of sample holders or containers made of materials such as 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.