Aktuelle Forschungsprojekte

Image In-situ investigation concerning the swelling behaviour of polymer materials under elevated pressures and temperatures
Image Swirl-free on the move...
Image Investigation of materials
Image Lifetime prediction of hermetic compressor systems
Image Development of a Cryogenic Magnetic Air Separation Unit
Image Filter Tests
Image Reducing the filling quantity
Image Low Temperature Measuring Service
Image Laseroptical measurement
Image Solar Cooling
Image Certifiable connection types in cryogenics
Image Range of services laboratory analyses
Image Reduction of primary noise sources of fans
Image Hybrid- Fluid for CO2-Sublimation Cycle
Image Humidifier System for High-Purity Gases
Image Test procedures for electrical components

You are here:   /  Home


Tribological investigations of oil-refrigerant-material-systems

Dr.-Ing. Margrit Junk

+49-351-4081-5419

Modified Almen-Wieland wear testing machine

The modified Almen-Wieland wear testing machine is used for the determination of the tribological properties of oil-refrigerant-bearing-systems under mixed friction conditions. The interaction of lubricants, additives, refrigerants and materials is tested. On the basis of these investigations refrigeration oils and materials could be preselected, but the tests can not substitute field test with refrigeration machines.

Principle

Two half bearings are pressed hydraulically against a test pin rotating horizontally in the lubricant.

The extreme pressure failure, i. e. the load bearing capacity of oil, is determined by increasing continuously or stepwise the test load until seizure of pin and bearing occurs and the pin breaks. The coefficient of friction and the wear are determined with constant (low) load applied during a prescribed test time.

Specialties

  • Hermetic test cell, which allows testing with refrigerant pressures up to 10 bar.
  • Thermostated test cell for a defined lubricant temperature.
  • Continuous record of fest force, turning moment, pressure of refrigerant, temperature and wear.
  • Use of both Almen-Wieland and half bearings with Falex geometry (dimensions of the V-block than the original Falex bearings according to ASTM D 3233).
  • Adaption of the tribological system by choosing materials of test pins and half bearings.

Our services

  • Evaluation of lubricant-refrigerant-material-systems by load bearing capacity of lubricant (extreme pressure failure load), coefficient of friction, wear, changes of lubricant
  • Evaluation of tribological systems after changing lubricants, refrigerants or bearing materials in order to minimize expensive field tests
  • Failure analysis

 


Your Request

Further Projects

Image

Solar Cooling

Solar Cooling with Photovoltaic

Image

Hydrogen and methane testing field at the ILK

Simultaneously pressures up to 1,000 bar, temperatures down to -263°C

Image

Low noise and non metallic liquid-helium cryostat

Low-noise Magnetic Field Cryostat for SQUID-Applications

Image

Cryostats, Non-Metallic and Metallic

position indenpendent, highest endurance, tiltable for liquid helium and liquid nitrogen