Robert Boschgmbh

Other

Klaus Czerwinski

Bernd Reinsch

Dietrich Trachte

Wilfried Aichele

Jochen Rager

Andreas Burghardt

Klaus Hrastnik

Johannes Schmid

Lars Menken

Josef Arnold

Eberhard Grath

Eva Weisser

Otto W Stenzel

Joost Nowak

Iris Postler

In a method for preparing an ester from an hydroxybenzoic acid and a fatty alcohol for use in a binder system for powder injection molding, transesterification of an ester of the hydroxybenzoic acid and a low alcohol using the fatty alcohol is carried out, the fatty alcohol and the ester of the hydroxybenzoic acid and the low alcohol forming a reaction mixture and being used in an essentially equimolar ratio. The transesterification is carried out at a temperature at which the ester of the hydroxybenzoic acid and the low alcohol and the fatty alcohol are present as a homogeneous melt. The binder system for a powder injection molding contains 80 to 98 wt. % of a metal powder and/or a ceramic powder and 1 to 19 wt. % of a polymeric binder component, and 1 to 19 wt. % of at least one ester prepared by the transesterification.

Method for preparing an ester and binder system

A spark plug for an internal combustion engine is proposed, having at least two electrodes (), one of which at least two electrodes is at least one middle electrode () and another electrode of the at least two electrodes is at least one ground electrode (), and between the at least one ground electrode () and the at least one middle electrode (), a spark gap () is formed. Each of the at least two electrodes () has an electrode base body (). At least one electrode has a region () that is highly resistant to electrode erosion and that forms at least a part of the end face, oriented toward the spark gap, of the electrode (). The highly electrode-erosion-resistant region () comprises an alloy which has at least the elements iridium and nickel.

Method of manufacturing a spark plug for an internal combustion engine

The present invention relates to a method of fabrication and a product, which forms a composite body made of metal and a porous ceramic blank, which adjoins the metallic portion and is infiltrated by the metal, wherein a gradient in properties across the composite portion of the composite body is formed by a heat treatment that reduces some of the oxides across the thickness of the porous ceramic blank. In one embodiment, a gradient from substantial chemical reaction to incomplete chemical reaction of the reducible oxides of the blank with the infiltrated metal is formed inside the composite portion.

Metal-ceramic composite material body and method for producing the same

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Iggingen, Germany

Klaus Czerwinski