LOW ALKALI SEALING FRITS, AND SEALS AND DEVICES UTILIZING SUCH FRITS

摘要

A solid oxide fuel cell device incorporates a sealing material resistant to hydrogen gas permeation at a sealing temperature in the intermediate temperature range of 600°C -900°C, the seal having a CTE in the 100x10-⁷/°C to 120x10-⁷/°C , wherein the sealing material comprises in weight %, of: (i) a 80 wt% to 100 wt % glass frit, the glass frit itself having a composition comprising in mole percent of : SiO₂ 15-65 ; Li₂O 0-5; Na₂O 0-5; K₂O 0-10; MgO 0-5; CaO 0-32; A1₂O₃ 0-10; B₂O₃ 0-50; SrO 0 to 25, wherein the total amount of alkalis is less than 10 mole%; and (ii) zirconia or leucite addition 0 wt % to 30 wt.