초록 ▼

An interconnector, or bipolar plate, for a high-temperature solid electrolyte fuel cell is composed of a sintered chromium alloy which has sintering pores and contains 90% by weight of Cr, from 3 to 8% by weight of Fe and optionally from 0.001 to 2% by weight of at least one element of the group of

An interconnector, or bipolar plate, for a high-temperature solid electrolyte fuel cell is composed of a sintered chromium alloy which has sintering pores and contains 90% by weight of Cr, from 3 to 8% by weight of Fe and optionally from 0.001 to 2% by weight of at least one element of the group of rare earth metals. The chromium alloy contains from 0.1 to 2% by weight of Al and the sintering pores are at least partially filled with an oxidic compound containing Al and Cr. The interconnector has a high impermeability to gas and dimensional stability.

대표청구항 ▼

1. An interconnector for a high-temperature solid electrolyte fuel cell, comprising: a sintered chromium alloy formed with sintering pores, said chromium alloy containing: >90% by weight of Cr;3-8% by weight of Fe;0.1 to 2% by weight of Al; andsaid sintering pores being at least partly filled with a

1. An interconnector for a high-temperature solid electrolyte fuel cell, comprising: a sintered chromium alloy formed with sintering pores, said chromium alloy containing: >90% by weight of Cr;3-8% by weight of Fe;0.1 to 2% by weight of Al; andsaid sintering pores being at least partly filled with an oxidic compound containing Al in an oxidized state and Cr in an oxidized state. 2. The interconnector according to claim 1, wherein said oxidic compound containing Al and Cr has a ratio of Al to Cr, expressed in atom % to atom %, greater than 1. 3. The interconnector according to claim 2, wherein said ratio of Al to Cr, in atom %, of said oxidic compound is greater than 2. 4. The interconnector according to claim 1, wherein said oxidic compound containing Al and Cr is an Al—Cr mixed oxide. 5. The interconnector according to claim 1, wherein said oxidic compound containing Al and Cr is xAl2O3yCr2O3, where x and y are stoichiometric factors. 6. The interconnector according to claim 1, wherein at least 50% by volume of a total volume of said sintering pores of said chromium alloy is filled with said oxidic compound containing Al and Cr. 7. The interconnector according to claim 1, wherein 90% by weight of Cr;3 -8% by weight of Fe;0.1 to 2% by weight of Al; andwherein one of the following is true: all of said sintering pores are at least partly filled with a compound containing Al and Cr, each in oxidized form; orat least some of said sintering pores are completely filled with a compound containing Al and Cr, each in oxidized form; orat least some of said sintering pores are completely filled with a compound containing Al and Cr, each in oxidized form. 15. The interconnector according to claim 14, wherein said sintering pores take up from 2% to 20% of a volume of said sintered chromium alloy. 16. The interconnector according to claim 14, wherein said chromium alloy further contains 0.001-2% by weight of at least one element selected from the group consisting of rare earth metals. 17. A high-temperature solid electrolyte fuel cell, comprising: a ceramic solid electrolyte formed of stabilized zirconium oxide; andan interconnector of claim 1. 18. A method of producing an interconnector of claim 1, which comprises the following method steps: producing a powder mix from one or more of a mixed powder, a partly pre-alloyed powder, and a fully pre-alloyed powder;shaping by die pressing at a pressing pressure p set to 500 p 1000 MPa; optionally presintering at a temperature T set to 700° C. T 1200° C. in a reducing atmosphere and optionally calibration pressing at a pressing pressure p set to 500 p 1000 MPa;sintering at a temperature T set to 1200° C. T solidus temperature in a reducing atmosphere; oxidatively treating; for producing an interconnector of claim 1. 19. The method according to claim 18, which comprises setting a temperature T for the oxidative treatment to 700° C.