High-temperature joining by soldering or adhesive bonding

Topic

© Fraunhofer IKTS
Active solder joint between ceramic foam heating element and a contact element.

Abrasive, chemical, electrical, thermal, sensory, or mechanical tasks require different combinations of ceramic materials or ceramic-metal-plastic composites. In conjunction with soldering concepts, this results in suitable solutions for electrical contacts or system concepts that also deliver innovations for plasma technologies, electrical and electronic components, control and regulation components, sensors, thermoelectric applications, or catalytic processes.

Fraunhofer IKTS uses and modifies commercial solders and adhesives or develops special solder materials to find suitable solutions. Our work focuses on high-temperature-resistant soldered joints for temperatures > 1000 °C, low-stress active soldering techniques with soldering temperatures < 600 °C for ceramic-metal composites, or joints between different ceramic components and ceramic materials. This enables new concepts in mechanical engineering, chemical processes, measurement technology, automotive engineering, the pharmaceutical industry, energy technology, electrical engineering, and electronics.

Application examples / references
 

  • Electrical contacting of ceramic heating conductors
  • High-temperature-stable solder joints with Fe-Si-Ti solders
  • Aluminum-aluminum oxide composites with Al-Cu-Si solder


Services offered
 

  • Concept development for joining components and systems
  • Joining ceramic and metallic materials using active soldering, bonding, and diffusion bonding
  • Active soldering using commercially available solders under vacuum or protective gas
  • Solder development for ceramic/ceramic or ceramic/metal material composites for high-temperature applications up to 1500 °C
  • Metallization of ceramic surfaces by build-up soldering
  • Soldering process for joining low-stress metal-ceramic composites at low temperatures, especially for aluminum alloys


Technical equipment

 

  • High-temperature tungsten furnace for applications up to 2200 °C, in variable atmospheres (up to 10-5 mbar vacuum, Ar, N2, H2 and gas mixtures)
  • Mechanical materials testing for composite characterization, especially bending, tensile, compression and shear tests and high-temperature strength