Abstract: A fuel cell (1) has a plate (2) produced by powder metallurgy which comprises in one piece a porous substrate area (4) to which the electrochemically active cell layers (6) are applied, and a gastight edge area (5) which is provided with gas passages (17, 18).

Abstract: A molding is produced with a disk-shaped or plate-shaped basic body having a large number of knob-like and/or web-like elevations which merge into the basic body with inclined side surfaces. The molding is produced by pressing and sintering powdery raw materials close to the final shape. First, the boundary surfaces of the basic body are pressed to final shape as far as the transition regions of the elevations and the elevations are pressed to an oversize. The projection height of the elevations from the basic body is greater than the projection height in the finally pressed state. Their side surfaces form an angle of inclination in the range from 90°-150° with the respectively adjacent boundary surface of the basic body. Then the elevations are pressed to near final shape while the angle of inclination is enlarged to a greater value.

Abstract: A plate-shaped, porous, carrier substrate produced by powder metallurgy for a metal-supported electrochemical functional device, includes a marginal region and a central region with a surface configured to receive a layer stack with electrochemically active layers on a cell-facing side of the carrier substrate. A surface section of the marginal region has a melt phase of the carrier substrate material on the cell-facing side of the carrier substrate. At least sections of a region located beneath the surface section having the melt phase have a higher porosity than the surface section disposed above them and having the melt phase.

Abstract: A fuel cell (1) has a plate (2) produced by powder metallurgy which comprises in one piece a porous substrate area (4) to which the electrochemically active cell layers (6) are applied, and a gastight edge area (5) which is provided with gas passages (17, 18).

Abstract: A molding is produced with a disk-shaped or plate-shaped basic body having a large number of knob-like and/or web-like elevations which merge into the basic body with inclined side surfaces. The molding is produced by pressing and sintering powdery raw materials close to the final shape. First, the boundary surfaces of the basic body are pressed to final shape as far as the transition regions of the elevations and the elevations are pressed to an oversize. The projection height of the elevations from the basic body is greater than the projection height in the finally pressed state. Their side surfaces form an angle of inclination in the range from 90°-150° with the respectively adjacent boundary surface of the basic body. Then the elevations are pressed to near final shape while the angle of inclination is enlarged to a greater value.

Abstract: The invention relates to a process for producing a molding, comprising a disk-like or plate-like basic body -5- having a large number of knob-like and/or web-like elevations -4-3- which merge into the basic body -5- with inclined side surfaces, by means of pressing and sintering powdery raw materials close to the final shape. According to the invention, the pressing is carried out in a two-stage pressing operation. In the first stage the boundary surfaces of the basic body -5- are pressed to at least the approximate final shape as far as the transition regions of the elevations -3-4- and, at the same time, the elevations -3-4- are pressed to an oversize. The projection h? of the elevations -3-4- from the basic body -5- is greater by 10%-150% as compared with the projection h from the basic body -5- in the finally pressed state. Their side surfaces form an angle of inclination ?? in the range from 90°-150° with the respectively adjacent boundary surface of the basic body -5-.

Abstract: A porous body which has a density of from 40 to 70%, is formed from an Fe-based alloy and contains from 0.01 to 2% by weight of mixed oxide with at least one oxidic compound of one or more metals from the group consisting of Y, Sc, rare earth metals and at least one further oxidic compound of one or more metals from the group consisting of Ti, Al, Cr. The porous body displays no after-shrinkage even at operating temperatures of 900° C., it has very good corrosion resistance and it is particularly suitable as a support substrate for use in high-temperature fuel cells.

Abstract: A fuel cell (1) has a plate (2) produced by powder metallurgy which comprises in one piece a porous substrate area (4) to which the electrochemically active cell layers (6) are applied, and a gastight edge area (5) which is provided with gas passages (17, 18).

Abstract: A process for producing a shaped body includes the steps of producing a molding composition, plasticization of the molding composition in an extruder and discharge through a slit die, introduction of the green body into a smoothing calender, smoothing the green body through the use of one or more smoothing processes, chemical and/or thermal binder removal and sintering. The continuous process preferably makes it possible to economically produce sheet products having a high surface quality.

Abstract: A porous body which has a density of from 40 to 70%, is formed from an Fe-based alloy and contains from 0.01 to 2% by weight of mixed oxide with at least one oxidic compound of one or more metals from the group consisting of Y, Sc, rare earth metals and at least one further oxidic compound of one or more metals from the group consisting of Ti, Al, Cr. The porous body displays no after-shrinkage even at operating temperatures of 900° C., it has very good corrosion resistance and it is particularly suitable as a support substrate for use in high-temperature fuel cells.

Abstract: Highly dense shaped parts are produced with a powder metallurgic process. The parts are formed of an alloy that, besides of at least 20 weight % chromium, consists of iron and one or several additional alloy portions that in sum do not amount to more than 10 weight %. The part is produced by pressing and sintering to near final shape a ready-to-press powder where the additional alloy portions are introduced in form of a master-alloy powder. The master-alloy may contain the following variations: the additional alloy portions and the iron portions; or the additional alloy portions, the iron parts, and the chromium portions; or additional alloy portions and the chromium portions.

Abstract: The invention relates to a process for producing a molding, comprising a disk-like or plate-like basic body —5— having a large number of knob-like and/or web-like elevations —4—3— which merge into the basic body —5— with inclined side surfaces, by means of pressing and sintering powdery raw materials close to the final shape. According to the invention, the pressing is carried out in a two-stage pressing operation. In the first stage the boundary surfaces of the basic body —5— are pressed to at least the approximate final shape as far as the transition regions of the elevations —3—4— and, at the same time, the elevations —3—4— are pressed to an oversize. The projection h? of the elevations —3—4— from the basic body —5— is greater by 10%-150% as compared with the projection h from the basic body —5— in the finally pressed state. Their side surfaces form an angle of inclination ?? in the range from 90°-150° with the respectively adjacent boundary surface of the basic body —5—.

Abstract: Highly dense shaped parts are produced with a powder metallurgic process. The parts are formed of an alloy that, besides of at least 20 weight % chromium, consists of iron and one or several additional alloy portions that in sum do not amount to more than 10 weight %. The part is produced by pressing and sintering to near final shape a ready-to-press powder where the additional alloy portions are introduced in form of a master-alloy powder. The master-alloy may contain the following variations: the additional alloy portions and the iron portions; or the additional alloy portions, the iron parts, and the chromium portions; or additional alloy portions and the chromium portions.