Daimler-benz Ag

Mercedes-benz Aktiengesellschaft

Eggert Tank

Wolfgang Kleinekathofer

Manfred Stute

Peter Straub

Klaus Wiegard

Horst Buhl

Karlheinz Kinast

Dieter Hedrich

Franz Pigisch

Coated components are produced to withstand high stresses and are composed of the intermetallic phase titanium aluminide material for use, in particular, in piston engines, gas turbines and exhaust gas turbochargers. This material has good technical properties but otherwise only a low resistance to oxidation and wear as a result of friction processes. These disadvantages are overcome in that the components are coated, at least on the parts of their surface which are at risk of hot corrosion and/or wear, with a sheet of a solderable nickel-based alloy soldered on under vacuum. A coating thickness of 0.1 to 0.4 mm is adequate. The nickel-based alloys, of which the soldered-on sheet is composed, preferably have a melting point of below 1180.degree. C.

High stress capability, intermetallic phase titanium aluminide coated

A process for producing an aluminum/magnesium alloy containing refractory material particles is described, wherein a particle-rich magnesium pre-alloy is first produced and from which the appropriate aluminum/magnesium alloy is then obtained by dissolution in aluminum.

Process for producing an aluminum/magnesium alloy

A coated valve, in particular an inlet valve for internal combustion engines, is provided, which is provided with a deposit preventing layer containing cerium (IV) oxide. A process for coating a valve with the deposit preventing layer containing cerium (IV) oxide is also provided.

Coated valve for internal combustion engine

A process is described for producing fiber-reinforced light-metal castings in which a loose fiber tangle is placed in a casting mold and is saturated with molten light-metal under low pressure. Subsequently, the excess of molten light-metal is squeezed off while the fiber tangle is compressed. The outflow of the molten light-metal is then stopped with the molten light-metal being solidified under high pressure. The process is especially suitable for utilizing the solution-spun inorganic fiber tangles that up to now had not been especially suitable for the reinforcing of light-metals.

Process for producing fiber-reinforced light-metal castings

A process is provided for the production of fibre-reinforced light-metal castings by die casting. A fibre moulding is introduced into an auxiliary mould and the auxiliary mould is heated to an optimum temperature above the melting point of the light metal. The auxiliary mould is then inserted with positive fit into a die casting mould corresponding to the outer contour of the auxiliary mould and filled with light metal under pressure. The fibre moulding can optionally be stabilized by means of a temporary organic binder which decomposes when the auxiliary mould is heated.

Process for manufacturing fiber reinforced light metal castings

The use of an alloy composed of 15 to 19% by weight of Cr, 5 to 32.5% by weight of Mo, 0.3 to 10% by weight of Si, up to 10% by weight of Al and up to 4.5% by weight of Ti, the remainder being Ni, as a sliding material for seals on rotary regenerative heat exchangers with a ceramic core is described. The sliding material is suitable especially for use in temperature ranges up to about 1100.degree. C.

Sliding material for seals on rotary regenerative heat exchangers with a

A bucket for an adjustable turbine guide baffle system for gas turbines is formed of an alloy material comprised of a dispersion-strengthened Fe-Cr-Al alloy containing 64.5-75.5% by weight of Fe, 15-25% by weight of Cr, 3-8% by weight of Al, 0.1-1% by weight of Ti, 0-3% by weight of Co, 0.1% by weight of Y or Ce, and 0.1-1.5% by weight of yttrium oxide or aluminum oxide. The bucket has a shank which is under friction stress in the guide baffle system and which is coated with a layer of slip-providing material that contains 90-100% by weight of nickel oxide and 0-10% by weight of one or more oxides of chromium, aluminum, zirconium, titanium, iron, manganese, or magnesium.

Bucket for an adjustable turbine inlet guide baffle system

A regenerative heat-exchanger of a gas turbine with a ceramic heat-exchanger disk, a metallic toothed rim substantially coaxially surrounding the heat-exchanger disk under formation of an annular space, compression springs arranged in the annular space which are supported under prestress, on the one hand, against the inside of the toothed rim and, on the other, against the outside of curved entrainment plate means; each entrainment plate means includes a support member and an adherent layer whose concave inner side abuts at the edge of the heat-exchanger disk, whereby the adherent layer essentially consists of metal fibers which form a plastically deformable felt-like adherent layer providing a good frictional engagement to transmit the driving torque to the heat-exchanger disk.

Regenerative heat-exchanger of a gas turbine

A heat-exchanger for gases of greatly varying temperatures, especially for use in gas turbines, which essentially consists of a collective space, for example, of a pipe-shaped collective space for the cold gas and of a metal recuperator which is formed by a large number of preferably U-shaped pipes which are welded or brazed into the collective chamber, whereby the hotter gases flow through between the pipes of the recuperator to give off some of their heat to the compressor air flowing through these pipes; one or several protective sheet metal members are arranged within the area of the connecting places between the pipes of the recuperator and the collective chamber which protect the welded or brazed joints against the hot gases.

Heat exchanger for gases of greatly varying temperatures

A cross-current pipe heat-exchanger for gases, especially for a gas turbine installation, with at least one collective space for the heat-absorbing gas and a bundle of pipes adjoining a wall of the collective space and formed of a large number of individual pipes fastened in the wall and conductively connected with the collective space; the gas stream which gives off heat thereby flows transversely through the pipe bundle; a number of pipes in the pipe bundle arranged on the inlet side are constructed relatively thick-walled, at least within the area of their fastening in the wall; preferably these thick-walled pipes have a wall thickness of about 50 to 100% of the wall thickness of the wall portion forming the adjacent collective space.

Cross-current pipe heat-exchanger for gases

A method for reducing harmful stresses in layers, particularly ceramic layers such as aluminum oxide, chrome oxide or nickel oxide and calcium fluoride applied by thermal spraying on metallic structural parts in which the applied layer is subdivided in planes extending generally perpendicularly to the layer surface by partition members.

Method for reducing harmful stresses in layers applied by thermal

A sealing element between the storage body and a gas channel of a regenerative heat-exchanger, which consists of a slide layer of graphite, of a metallic support bar and of a connecting layer disposed therebetween; the support bar includes a bottom portion and two side portions which laterally surround in part the slide layer whereas the connecting layer is applied to the inner sides of the bottom portion and the side portions with the slide layer embedded in the connecting layer.

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Wernau, Germany

Eggert Tank