Daimler Chrysler Ag

Daimler-benz Ag

Steffen Rauscher

Tilmann Haug

Michael Scheydecker

Karl Weisskopf

Kolja Rebstock

Tilman Haug

Tanja Tschirge

Michaael Scheydecker

Christoph Hesselmann

Michael Schleydecker

Rainer Zimmermann-Chopin

Markus Walters

A die provided for fixing a porous ceramic insert for producing a light metal component which is reinforced by the insert. For this purpose, the insert is positioned in the die in such a way that any force which occurs for the purpose of fixing the insert is compensated for by a collinear force, which minimizes the bending moments exerted on the insert. Furthermore, shielding elements are used to protect the insert from a casting metal flowing into the die. Furthermore, the invention describes a process in which the velocity of a casting plunger which moves the casting metal into the die is regulated in such a way that the insert is not damaged by the kinetic energy of the casting metal. This is achieved by filling the die at a low velocity until the metal has flowed around the insert. Then, the casting plunger is accelerated, thus ensuring optimum filling of the die with the casting metal.

Casting tool and method of producing a component

The invention relates to a process for producing a component from an Al,O,/titanium aluminide composite material. To produce the component, a shaped body is pressed from a starting mix of titanium, in particular as an oxide, carbon and/or its precursors, fillers and binders. At a conversion temperature, the shaped body is subjected to a heat treatment in order to form a pressure-stable sacrificial body. In the process, the filler and, if appropriate, the binder is/are also removed by thermal means. The sacrificial body is filled with aluminum and/or an aluminum alloy under pressure. The filling takes place at a filling temperature which is above the conversion temperature. Then, the temperature is reduced to a transformation temperature, the materials of the filled sacrificial body and the aluminum reacting through a solid-state reaction, below the filling temperature, to form an Al,O,/titanium aluminide composite body.

Method for producing a component from a composite Al2O3/titanium aluminide material

A component is made, in regions, of a ceramic-metal composite material. A porous sacrificial body produced from ceramic precursors is filled with softened metal and/or a metallic alloy at a predeterminable filling temperature at or above the softening temperature of the filling metal and under superatmospheric pressure. The filled sacrificial body is heated to or above a reaction temperature which is higher than the filling temperature, where a reaction between the filling metal (FMe) and the metal of the ceramic of the sacrificial body (CMe) is carried out, forming the ceramic-metal composite material comprising a ceramic phase and a metallic phase. The ceramic phase comprises CMe,B,and/or CMe,C,and/or CMe,CN and FMe,O,, and the metallic phase comprises an intermetallic compound of a metal of the ceramic (CMe) and a filling metal (FMe). The sacrificial body is filled with the filling metal (FMe) during pressure casting of the component. A shape at least close to the final shape of the component, comprising a filled sacrificial body and the intermediate element(s) free of the sacrificial body, is cast by the pressure casting tool, and the component after casting is complete is heated to or above the reaction temperature in the region of the sacrificial body.

Process for producing a component and a component produced thereby having particular use in vehicle disc brakes

A process for producing a ceramic-metal composite, includes (1) mixing TiO,, and optionally Ti, with at least one of a boron-containing or carbon-containing material to give a green body mix; (2) heat treating the green body mix to a temperature from 900&deg; C. to 1900&deg; C. and below a temperature which leads to an autocatalytic reaction; (3) carrying out an exchange reaction between the material and the TiO,to give a reaction product comprising at least one of TiB,and TiC,, wherein 0&lE;x 23 2 and 0&lE;y&lE;1; (4) producing a porous green body from the reaction product; (5) filling the porous green body with liquid aluminum after the exchange reaction; and (6) carrying out a reaction between the reaction product in the green body and the aluminum to form the ceramic-metal composite comprising a ceramic phase selected from the group consisting of TiB,-, TiC,-, TiCN- and Al,O,and a comprising a metallic phase comprising an intermetallic compound of Ti and Al.

Method for producing ceramic-metal composite bodies, ceramic-metal composite bodies and their use

A process for manufacturing ceramic metal composite bodies, the ceramic metal composite bodies and their use. The process is based on molten infiltration and the simultaneous or delayed exchange reaction of ceramic or metal ceramic un-fired bodies or sintered bodies which may consist of nitrides or carbides as well as metals, with molten metal of additional metals, whereby new nitride, carbide and intermetallic phases are formed which have improved wear and high-temperature characteristics. These ceramic metal composite bodies can be used for tribological applications.

Process for manufacturing ceramic metal composite bodies, the ceramic metal composite bodies and their use

A process for manufacturing a ceramic metal composite body in the case of which a dimensionally stable and porous sacrificial body is produced from ceramic initial products and is filled at a filling temperature with a softened metal, particularly under an increased pressure. The filled sacrificial body is heated to a reaction temperature and the metal to be filled in, BMe, is reacted with a metal of the ceramics. KMe, forming the ceramic metal composite body which has a ceramic phase having KMe.sub.m B.sub.x and/or KMe.sub.n C.sub.y and/or KMe.sub.o CN and BMe.sub.p O.sub.3 and has a metallic phase having an intermetallic compound which is formed of KMe and BMe, the filling temperature being lower than the reaction temperature and higher than or equal to the softening temperature of the metal.

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Ulm, Germany

Steffen Rauscher