[MENKEN, Lars, REINSCH, Bernd, HRASTNIK, Klaus, TRACHTE, Dietrich, CZERWINSKI, Klaus] {Postfach 30 02 20 70442 Stuttgart;DE(DE)(DE)}{Rosenstrasse 2 73072 Donzdorf;DE(DE)(DE)}{Auguste-Supper-Strasse 29 71642 Ludwigsburg;DE(DE)(DE)}{Liststrasse 46 70180 Stuttgart;DE(DE)(DE)}{Hoffmannstrasse 58 71229 Leonberg;DE(DE)(DE)}{Sturzaeckerstrasse 46 73574 Iggingen;DE(DE)(DE)} The invention relates to a spark plug for an internal combustion engine, comprising at least two electrodes (9, 11). One of said at least two electrodes is at least one center electrode (11) and another electrode of the at least two electrodes is at least one shell electrode (9), a spark gap (13) being formed between the at least one shell electrode (9) and the at least one center electrode (11). Each of the at least two electrodes (9, 11) comprises an electrode base (93, 113). At least one electrode has a highly erosion-resistant section (95, 115) that configures at least a part of the front face of the electrode (97, 117) facing the spark gap. Said highly erosion-resistant section (95, 115) consists of an alloy that contains at least the elements iridium and nickel.

[MENKEN, Lars, REINSCH, Bernd, HRASTNIK, Klaus, CZERWINSKI, Klaus, KAISER, Thomas] {Postfach 30 02 20 70442 Stuttgart;DE(DE)(DE)}{Rosenstrasse 2 73072 Donzdorf;DE(DE)(DE)}{Auguste-Supper-Str. 29 71642 Ludwigsburg;DE(DE)(DE)}{Liststrasse 67 70180 Stuttgart;DE(DE)(DE)}{Sturzaeckerstr. 46 73574 Iggingen;DE(DE)(DE)}{Fleckenweinberg 36 70192 Stuttgart;DE(DE)(DE)} The invention relates to a spark plug (10) comprising at least one earth electrode (61, 62) and a central electrode (51) arranged in an insulator (31). Said earth electrode (61, 62) and/or the central electrode (51) comprise, at least in regions, a ferritic iron alloy containing at least 50 mass % of Fe, between 14 and 25 mass % of Cr, between 1.5 and 5.5 mass % of Al, and between 0.01 and 0.2 mass % of an element or a combination of elements from the group containing Y, Hf, Ce and La.

[Klaus Hrastnik] DE,,Stuttgart; A nickel alloy has 10-20 weight percent of chromium, and 1-4 weight percent of an element selected from the group consisting of aluminum, silicium and both, and can be used in an electrode, for example in an ignition device.

[Klaus Hrastnik, Simon Schmittinger, Dieter Holz] DE,,Stuttgart;DE,,Renningen;DE,,Affalterbach; A sealing apparatus and a method for sealing, which make possible reduced installation space and assembly at room temperature, are proposed. The sealing apparatus encompasses a ceramic base element and a metallic housing. The ceramic base element comprises on an outer wall at least one circumferential flute in the region of which the housing is pressed in positively fitting fashion onto the ceramic base element.

[HALUSCHKA, Christoph, ARNOLD, Juergen, WEIN, Vera, BACH, Rainer, HRASTNIK, Klaus, KERN, Christoph] {Postfach 30 02 20 70442 Stuttgart;DE(DE)(DE)}{Altenbrunn 16 D-63911 Klingenberg;DE(DE)(DE)}{Kopernikusstrasse 24 71726 Benningen;DE(DE)(DE)}{Silberburgstrasse 84 70176 Stuttgart;DE(DE)(DE)}{Im Schönblick 22 75446 Wiernsheim;DE(DE)(DE)}{Liststrasse 64 70180 Stuttgart;DE(AT)(DE)}{Wilhelmstrasse 5 71546 Aspach;DE(DE)(DE)} The invention relates to a sheathed element heater plug, especially for starting a self-igniting combustion engine. The inventive sheathed element heater plug comprises a heater plug that engages in a combustion chamber which is provided with a combustible mixture consisting of fuel and air. Said heater plug comprises electroconductive ceramics and can be heated to an ignition temperature by connecting to a voltage source. According to the invention, the sheathed element heater plug (10) comprises an integrated temperature sensor (30).

[Manfred Roessler, Klaus Hrastnik, Thomas Jaeger, Christoph Brehm] DE,,Stuttgart;DE,,Stuttgart;DE,,Erdmannhausen;DE,,Bamberg; An ignition device, particularly a spark plug for internal combustion engines, permits improved corrosion protection. The ignition device includes an electrical connector and a tubular, metallic housing having a screw-in thread imprinted on it. At least one of the metallic components of the ignition device is provided at least partially with a protective coating made of a zinc/nickel alloy.

[Christoph Haluschka, Juergen Arnold, Vera Wein, Rainer Bach, Klaus Hrastnik, Christoph Kern] ,Klingenberg,,;,Benningen,,;,Stuttgart,,;,Wiernsheim,,;,Stuttgart,,;,Aspach,, A sheathed-type glow plug is provided, for example, for starting a self-igniting combustion engine, including a heating pin engaging in a combustion chamber having an ignitable fuel-air mixture, which includes an electrically conductive ceramic, and which may be heated to an ignition temperature by being connected to a voltage source, the sheathed-type glow plug surrounding an integrated temperature sensor.

[HRASTNIK, Klaus, SCHMITTINGER, Simon, HOLZ, Dieter] {Postfach 30 02 20 70442 Stuttgart;DE(DE)(DE)}{Liststrasse 67 70180 Stuttgart;DE(DE)(DE)}{Wilhelmstr. 13 71272 Renningen;DE(DE)(DE)}{Talstr. 48 71563 Affalterbach;DE(DE)(DE)} The invention relates to a sealing device (1) and a sealing method, which allow for reduced installation space and an installation at room temperature. The sealing device (1) comprises a ceramic base (5) and a metal housing (10). An outer wall (15) of the ceramic base (5) is provided with at least one peripheral groove (20) in whose area the housing is press-fit onto the ceramic base (5) in a positive fit.

[WINTER, Falko, HRASTNIK, Klaus, HERWERTH, Marion] {Postfach 30 02 20 70442 Stuttgart;DE(DE)(DE)}{Untere Gasse 10/3 71706 Markgroeningen;DE(DE)(DE)}{Liststr. 67 70180 Stuttgart;DE(AT)(DE)}{Hauptstr. 175 71642 Ludwigsburg;DE(DE)(DE)} The invention proceeds from a process for producing a magnetic element (10) for an electric machine, in particular a claw pole generator, the element (10) being subjected after a shaping process to a subsequent thermal treatment. It is proposed to apply the thermal treatment by electromagnetic induction. Also disclosed is a device for carrying out the process.

[VENN, Carsten, HRASTNIK, Klaus, JAEGER, Thomas, SCHMID, Hellmut] {Postfach 30 02 20 70442 Stuttgart;DE(DE)(DE)}{Hemmerleinstrasse 6 96050 Bamberg;DE(DE)(DE)}{Liststrasse 46 70180 Stuttgart;DE(AU)(DE)}{Martin-Luther-Strasse 7 71729 Erdmannhausen;DE(DE)(DE)}{Allmandklinge 47 74343 Sachsenheim;DE(DE)(DE)} The invention relates to an ignition device, in particular, a spark plug for a spark-ignition engine which comprises an electric connecting element (11) and a tubular, metallic housing (13), engraved with a screw thread (18). At least one of the metallic components of the spark plug is provided with a lacquer coating which protects the spark plug from corrosion.