Schwarzkopf Technologies Corporation

Schwarzkopf Development Corporation

Schwartzkopf Technologies Corporation

Plansee Se

Nikolaus Reheis

Gunter Kneringer

Robert Grill

Wolfgang Spielmann

Walter Thalmann

Michael Witwer

Gunther Kneringer

Walter Thalman

Christian Friedrich

Peter Pohl

Markus KÖGL

Heavily thermally stressable component

The invention relates to a method of making high-strength brazed joints in metal/ceramic and ceramic/ceramic composite materials. The brazing surface of the ceramic part is structured prior to brazing by introducing bores having an average diameter in the range of 50 .mu.m-500 .mu.m and a depth in the range of 100 .mu.m-2 mm. Preferably, the structuring is effected by laser working. Brazing is subsequently carried out in a conventional manner. The resulting joint displays increased strength characteristics and resistance to thermal stresses over joints produced by conventional methods.

Method of making high-strength brazed joints

The invention relates to a high temperature-resistant composite which consists of at least one part of molybdenum or a molybdenum alloy, and at least one part of graphite, which parts are joined together by means of a zirconium solder. A two-ply interlayer, consisting of a 0.01-0.5 mm thick layer of vanadium, and a 0.1-0.5 mm thick layer of tungsten, tantalum or niobium, is arranged between the part of molybdenum or the molybdenum alloy and the zirconium solder. The layer structure substantially prevents the formation of a eutectic between molybdenum or the molybdenum alloy and the zirconium solder, thereby preventing the reduction of the maximum permissible use temperature of the composite.

High temperature-resistant composite

The invention relates to a process for the manufacture of a solder joint between a part consisting of pyrolytic graphite and a metal part. According to the invention, the parts are not soldered directly to each other, but by way of an intermediate piece consisting of graphite reinforced with carbon fiber. In the process, pyrolytic graphite and carbon-fiber reinforced graphite are positioned in relation to each other in such a way that the stratification of pyrolytic graphite runs approximately parallel to the place of primary orientation of carbon fibers within the carbon-fiber reinforced graphite.

Process for the manufacture of a soldered joint

Growing community of inventors

Jerzens, Austria

Nikolaus Reheis