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