Sintec Keramik Gmbh & Co Kg

Deutsche Aerospace

Ulrich Goetz

Ulrich Papenburg

Ernst Blenninger

Peter Goedtke

Peter Sindlhauser

Rainer Hegermann

Manfred Lechner

Method for producing a resistive heating element by coating a substrate with an electrically insulating material from the gaseous phase, depositing an electrically conducting material from the gaseous phase onto the layer of insulating material deposited onto the substrate, wherein the layer of conducting material deposited onto the layer of insulating material is subsequently partially mechanically removed thereby forming at least one conductor path. The substrate is machined before depositing the insulating material thereby forming at least one recess provided for receiving the conductor path. The layers of insulating material and conducting material are deposited onto the mechanically processed substrate. Finally, the layer of conducting material is evenly removed until at least the conducting material has been completely removed from the elevated regions of the substrate delimiting the recess of the conductor path, thereby forming the conductor path. The invention also concerns a resistive heating element produced in this fashion.

Method for producing a resistive heating element

The invention concerns a piston of finest grain carbon, having a bending strength of at least 100 MPa, a bending elongation >0.8%, an average interlayer distance c/2<0.35 nm, an average crystallite size in the c direction >5 nm and a heat conductivity of at least 10 W/mK, and a method for its production comprising: a) compacting of a polyaromatic mesophase powder to almost its final shape; b) heating of the green product at ambient pressure under a non-oxidizing atmosphere to a temperature of between 900 to 1300&deg; C. and maintenance at this temperature; c) high-temperature treatment, thereby heating up to a temperature between 1400 and 2400&deg; C. and holding this temperature for between 2 and 20 hours; d) cooling down of the shaped form to an ambient temperature at less than 4 K/min, and a polyaromatic mesophase powder for the production of such a piston, characterized by a) a portion of quinoline-insoluble components of &gE;85 weight %; b) a portion of toluene-insoluble components of &gE;90 weight %; wherein c) a shaped form produced from the powder after sintering up to 1000&deg; C. has a mass residue of more than 90 weight % of the mass before sintering.

Piston consisting of finest grain carbon and method for producing the same

The invention concerns a resistance-heated vaporizer boat for vaporizing metal. According to the invention, a reduced temperature is generated in the edge region, i.e., along the longitudinal edge of the vaporizer boat, such that there is only a very slight wetting tendency along this longitudinal edge. Consequently, the melt can be localized such that it cannot overflow over the longitudinal edges of the vaporizer boat, without a cavity necessarily having to be provided in the vaporization surface of the vaporizer boat. As a result, optimum wetting and constantly targeted vaporization of the metal upwards towards the area to be vapor-deposited are attained.

Vaporizer boat for metal vaporizing

For the manufacturing of an oxidation-stable component that can withstand temperature changes for space travel, a solid CFC-body with a density of from 0.1 to 0.8 g/cm.sup.3, which has nondirectional short fibers, is made from short carbon fibers and a hardenable resin binder. From the solid CFC-body, a CFC-blank having the dimensions of the component to be manufactured is prepared by means of turning or other material cutting. The CFC-blank is infiltrated with pyrolytic carbon to a density of no more than 1.0 g/cm.sup.3 and then with metallic silicon so that its density amounts to more than 2.0 g/cm.sup.3. A portion of the metallic silicon is reacted with the pyrolytic carbon to form silicon carbide. The proportion of the unreacted metallic silicon which remains in the component after this reaction amounts to at least 15 percent by weight.

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Buching, Germany

Ulrich Goetz