Crystallizing glass sealants

From glass to glass ceramics: for joining metals, glasses, ceramics and combinations

Glass paste for screen printing.
© Fraunhofer ISC

Glass paste for screen printing.

Joining of two glass plates for photovoltaic application.
© Fraunhofer ISE

Joining of two glass plates for photovoltaic application.

Glass seal for high temperature fuel cells.
© Fraunhofer ISC

Glass seal for high temperature fuel cells.

The Glass Department of Fraunhofer ISC develops (crystallizing) glass sealants with specially adapted properties for bonding a wide variety of materials. In addition to glass development and production, suitable pastes are processed (e.g. by screen printing). The development and application of a temperature program for the bonding process is also realized by the glass group. Glass sealants can be used as joining material when polymer adhesives, solder metals and ceramic high-temperature adhesives reach their limits.

 

For combined requirements from the fields of

  • Gas tightness
  • High operating temperature (>> 600 °C)
  • Low difference between maximum processing temperature and operating temperature
  • Expansion coefficients unusual for glass (e.g. <5*6-10 K-1 or >9*10-6 K-1)
  • Chemical resistance to contact materials, liquids and gases
  •  

Possible fields of application

  • Fuel cells
  • Batteries
  • Solar cells
  • Sensors
  • Optical components
  • Electronic components
  •  

Current examples

  • Glass sealants for SOFC (Sealing Stacks): Cooperation with ElringKlinger AG and KIT; sponsored by BMWi; joining of metal-metal and metal-ceramics with a thermal expansion > 10*10-6 K-1
  • MAVO-PeroTec: Fraunhofer internal with ISE and IWM; sealing of a perovskite solar cell and electrical insulation of the individual cells. Joining of two soda-lime-silica glass panes