Glass Paste Sealant for SOFC/SOEC, 100 g/bottle, CSOFECGPS
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In the assembly of Solid Oxide Fuel Cells (SOFC) and Electrolysis Cells (SOEC), a glass paste sealant is a specialized suspension of glass-ceramic powder used to create hermetic, electrically insulating joins. While pre-shaped gaskets are used for large-scale production, paste is the preferred format for R&D, button cell testing, and complex manifolds where precise dispensing is required.
A sealing paste must balance the chemistry of the glass with the rheology of the organic vehicle to ensure it stays in place during assembly and flows perfectly during the "sealing run."
A high-performance screen-printing ink typically follows this mass distribution:
For a glass paste to be effective in an SOC environment, it must meet these strict criteria: (1) TEC Matching: The Coefficient of Thermal Expansion must be 9.5-12.0 * 10^{-6} K^{-1} to match the YSZ electrolyte and Crofer 22 APU interconnects. (2) Glass Transition (Tg): Typically 550 °C to 700 °C. The sealant must be rigid at operating temperatures but slightly viscous during thermal spikes to "self-heal" micro-cracks. (3) Electrical Resistivity: In SOEC mode, where voltages exceed 1.3 V, high resistivity is critical to prevent "Cr-bridge" formation (electrochemical migration of Chromium).
A glass paste is not "set" until it undergoes a specific heat treatment: (1) Binder Burn-out (200 °C–400 °C): Slow heating to remove organics without leaving carbon residue or causing "bloating." (2) Sintering & Wetting (700 °C–850 °C): The glass softens and wets the metal and ceramic surfaces, creating a gas-tight bond. (3) Crystallization (Devitrification): Held at a peak temperature (e.g., 900 °C) to transform the glass into a glass-ceramic. This makes the seal more mechanically robust and prevents it from flowing away during long-term operation.
| Part Number |
CSOFECGPS (C-SOFEC-EC-GPS) |
| Active Material |
Ba-Ca-Al-Borosilicate (50 wt% : 50wt%) Solid state content: ~70 wt% |
| Package Grade |
100 g/bottle (other grades, such as 500 g, and 1000 g or larger can be supplied upon request) |
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