Patent ID: 7214441

Claim:
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 700° C.–900° C., the seal having a CTE in the range of 70×10 −7 /° C. to 120×10 −7 /° C., wherein the sealing material comprises in weight %, of: (i) a 70 wt % to 100 wt % of glass frit, the glass frit itself having a composition comprising in mole percent of: SiO 2 15–65; Li 2 O 0–5; Na 2 O 0–5; K 2 O 0–10; MgO 0–5; CaO 0–32; Al 2 O 3 0–10; B 2 O 3 0–50; SrO 0 to 25, but no BaO, Y 2 O 3 , or La 2 O 3 , or other lanthanides, wherein the total amount of alkali is less than 10 mole %; and (ii) zirconia or leucite addition 0 wt % to 30 wt %.