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Current research projects

Image High Capacity Pulse Tube Cooler
Image Innovative Manufacturing Technologies for Cryosorption Systems
Image Production of novel barrier layers on polymer materials to reduce hydrogen permeation
Image Low Temperature Tribology
Image Characterisation of Superconductors in Hydrogen Atmosphere
Image Development of a Cryogenic Magnetic Air Separation Unit
Image CFE-Test of Cooker Hoods
Image Pulse-Tube-Refrigerator with sealed compressor
Image Test rigs for refrigeration and heat pump technology
Image Preformance measurements of heat exchangers
Image Performance tests of refrigerant compressors
Image Laseroptical measurement
Image Helium extraction from natural gas
Image Combined building and system simulation
Image Air-water heat pumps
Image Refrigerants, lubricants and mixtures

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Certifiable connection types in cryogenics

Dr. Andreas Kade

+49-351-4081-5117

Detachable and permanent connections, adhesive bond / form closure / force closure

The applications of cryogenic and vacuum technology impose special requirements on connection technologies. To determine the appropriate connections the application parameters such as temperature, vacuum and pressure, leak rate, materials, surface properties, radiation resistance, magnetic permeability etc. should be considered.

Connection technologies even if not being part of a standardized process more often have to be subject of a certification or qualification due to increasing quality requirements, e.g. pressure equipment directive 2014/68/EU. Therefore adequate designing and testing is necessary.

Alternative to electroplating process: cold gas sprayed copper layer (> 2 mm) with subsequent thread insertion
Alternative to electroplating process: cold gas sprayed copper layer (> 2 mm) with subsequent thread insertion

Innovations

The intended innovations relate to complete cryogenic systems considering the process chain from room temperature to low temperature range regarding the respectively required specifications. 

  • Development of application-related connection technologies with defined requirements and derived mechanical limit values 
  • Examination of existing connection technologies regarding applicability and further development towards secure and functional technologies
  • Evaluation and definition of application limits to aim for a feasible certification and the subsequent conformity with European guidelines

Project objectives

  • Application-related examination of various connection technologies
  • Further development and adaptation of existing connections to the requirements of cryogenic and vacuum technology
  • Examination on composite materials 
  • Examination on component geometries and their influence on the connection
  • Determination of process parameters (e.g. TIG welding, brazing,...) 
  • Determination of test limit values, especially for test specimens deviating from standards
  • Calculation according to common standards, simulation (FEM, ...) and testing
  • Realization and certification of selected connection technologies
Example of an examined connection between two materials (steel and PET) using a cutting edge at -90 ° C
Example of an examined connection between two materials (steel and PET) using a cutting edge at -90 ° C
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Further Projects

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Ionocaloric cooling

Ionocaloric solid-liquid phase cooling process

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Low temperature – test facilities

thermal cycling tests at very low temperatures

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In-Situ-Swelling Behaviour of Polymer Materials in Flammable Fluids

Material sciences

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Modular storage system for solar cooling

MoSsok

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All-in-one device for freeze-drying and production of biomaterial

with automated freezing and sterilisation option


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