Current research projects

Image Multifunctional electronic modules for cryogenic applications
Image Certifiable connection types in cryogenics
Image Ionocaloric cooling
Image Characterisation of Superconductors in Hydrogen Atmosphere
Image Electrical components in refrigeration circuits
Image 3D - Air flow sensor
Image Helium extraction from natural gas
Image Overall System Optimization of Refrigeration Plant Systems for Energy Transition and Climate Protection
Image Air-water heat pumps
Image Mass Spectrometer
Image Micro fluidic expansion valve
Image Hydrogen and methane testing field at the ILK
Image State of system and failure analyses
Image High Capacity Pulse Tube Cooler
Image Testing of mobile leak detectors according to DIN EN 14624
Image Low Temperature Measuring Service

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Low Temperature Tribology

Industry and R&D

Dipl.-Ing. Gunar Schroeder

+49-351-4081-5129

Tribological studies at cryogenic temperatures

For special applications at cryogenic temperatures the use of dry friction is necessary because the working temperatures are significant lower than the working range of liquid lubricants.

The ILK Dresden has extensive experience in the field of material testing at cryogenic temperatures and has developed a measuring system (from roomtemperature down to cryogenic temperatures) to determine the roughness and the coefficient of friction of different sliding material combinations.

The test stand consists of an experimental platform and a traversing mechanism with a force sensor, which is controlled via PC. The direct measurement of the friction force is carried out by the distance covered. Measurements can be performed down to −196 °C (lower temperatures on request). The cooling of the experimental platform and the samples is realised by a controlled liquid nitrogen heat exchanger/evaporator. Measurements are performed under an atmosphere of gaseous nitrogen to prevent the ingress of moisture. Thereby the experimental samples have no direct contact to liquid nitrogen. The uniform temperature distribution is measured by thermocouples, which are calibrated at the ILK Dresden.

Advantages: modular test setup which can be changed to specific requirements; adjustment of sample geometry and/or test track is possible.

Parameter

Measuring accuracyMeasuring range 0.4 N to 2 N≤ 1 % of measured value
Measuring range 2 N to 100 N≤ 0.5 % of measured value
Measuring range extendible up to 5 kN

Repeatability
(e.g. PTFE)

± 0.05 N respectively 1.5 % of coefficient of friction

Your Request

Further Projects - Research and Development

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Reducing the filling quantity

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Performance tests of condensing units

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State of system and failure analyses

Cause of the failure unknown?

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Thermostatic Expansion Valves

Does the TXV function correctly?