Current research projects

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Image In-Situ-Swelling Behaviour of Polymer Materials in Flammable Fluids
Image Micro heat exchangers in refrigeration
Image High temperature heat pump
Image Certification of efficient air conditioning and ventilation systems through the new "indoor air quality seal" for non-residential buildings
Image Investigation of coolants
Image Innovative Parahydrogen Generator Based on Magnets
Image Behavior of multiphase cryogenic fluids
Image Innovative small helium liquefier
Image Industry 4.0 membrane heat and mass exchanger (i-MWÜ4.0)
Image Laseroptical measurement
Image Energy efficiency consulting - cogeneration systems
Image Computational fluid dynamics CFD
Image Combined building and system simulation
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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

Image

Innovative small helium liquefier

Liquefaction rates from 10 to 15 l/h

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Filter Tests

INDUSTRIAL AND LABORATORY PRECIPITATORS

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Low Temperature Tribology

Tribological studies at cryogenic temperatures

Image

Investigation of coolants

Secondary loop refrigerants