W.c. Heraeus Gmbh & Co Kg

W.c. Heraeus Gmbh

Other

Ald Vacuum Technologies Gmbh

Marek Gorywoda

David Francis Lupton

Jonathan Lund

Alok Choudhury

Harald Scholz

Matthias Blum

Georg Jarczyk

Uwe Jantsch

Michael Hormann

Jorg Schielke

Friedhold Scholz

Bernard Serole

Bernd Stenger

Bruno Streb

Wolfram Graf

Marcus Kraus

Gunter Lindenmayer

Wolfgang Jablonski

A catalyst for the decomposition of NO under the conditions of the Ostwald process, comprising a carrier and a coating made of rhodium, rhodium/palladium or rhodium oxide applied thereto, ensures to yield NO with a particularly low content of laughing gas as the first process product.

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A process and a device for reducing the nitrous oxide which is formed during the catalytic combustion of ammonia and oxygen to form nitrogen oxides. A catalyst system including at least one first catalyst mesh element and at least one second catalyst mesh element is used for the catalytic combustion of ammonia and oxygen to form nitrogen oxides, where the minimum of one first catalyst mesh element is a platinum-rhodium mesh and the minimum of one second, downstream catalyst mesh element is a palladium-rhodium mesh with 2-4 wt. % of rhodium.

Method and apparatus for reducing nitrous oxide

The use of ceramic meshes is offered for spacing catalyst meshes apart from one another in the production of HCN, especially by the Andrussov process.

Catalyst assembly comprising catalyst meshes and ceramic meshes

In the production of precision castings by centrifugal casting with controlled solidification, a melt is cast under vacuum or shield gas into a pre-heated mold ( ) with a central gate ( ) and several mold cavities proceeding from the gate toward the outer circumference (D ) of the mold ( ). To prevent the formation of shrinkholes and porous areas in the castings, to save energy, and to increase the production rate, the mold ( ) is operated at temperatures which decrease from the inside toward the outside. The mold consists of a material or material combination with a coefficient of thermal conductivity lower than that of copper. Before the melt is poured, the mold ( ) is heated, starting from the gate ( ), by a heating device ( ), which projects into the gate, so that the gate ( ) reaches a temperature which is a function of the material being cast. Heating is carried out at a rate sufficient to produce a temperature Gradient of at least 100&deg; C., preferably of 200-600&deg; C., even more preferably of 300-500&deg; C., between the inside circumference (D ) and the outside circumference (D ). The invention is used preferable for the production of precision castings of metals of the group titanium, titanium alloys with at least 40 wt. % of the titanium, and superalloys.

Method and apparatus for the production of precision castings by centrifugal casting with controlled solidification

In the production of precision castings by centrifugal casting with controlled solidification, a melt is cast under vacuum or shield gas into a pre-heated mold (,) with a central gate (,) and several mold cavities proceeding from the gate toward the outer circumference (D,) of the mold (,). To prevent the formation of shrinkholes and porous areas in the castings, to save energy, and to increase the production rate, the mold (,) is operated at temperatures which decrease from the inside toward the outside. The mold consists of a material or material combination with a coefficient of thermal conductivity lower than that of copper. Before the melt is poured, the mold (,) is heated, starting from the gate (,), by a heating device (,), which projects into the gate, so that the gate (,) reaches a temperature which is a function of the material being cast. Heating is carried out at a rate sufficient to produce a temperature gradient of at least 100&deg; C., preferably of 200-600&deg; C., even more preferably of 300-500&deg; C., between the inside circumference (D,) and the outside circumference (D,). The invention is used preferably for the production of precision castings of metals of the group titanium, titanium alloys with at least 40 wt. % of the titanium, and superalloys.

Method for the production of precision castings by centrifugal casting with controlled solidification

Fine-mesh warp-knit fabrics of noble metal-containing wires with high specific surface areas, having good mechanical stability, are produced by warp-knitting noble metal-containing wires to form closed stitches, such that the warp-knit fabric has at least 14 stitches per inch, and such that in at least one of the knit weaves forming the warp-knit fabric, the noble metal-containing wires are laid down over at least three stitch spacings.

Warp-knit fabric of noble metal-containing wires, and method for the

A process for making an indium-tin-oxide shaped body, comprising: (a) filling an indium-tin-oxide powder into a first flexible mold, the indium-tin-oxide powder having a specific BET surface of at most 3 m.sup.2 /g with a mean primary particle size of 0.03 .mu.m to 1.0 .mu.m and/or having a density of at least 40% of theoretical density after cold pressing at a pressure of 100 MPa and/or the indium-tin-oxide powder being made by reacting at least two reaction partners comprising a molten indium-tin-metal alloy as a first reaction partner and oxygen as a second reaction partner in a plasma arc in a plasma chamber provided with an inlet opening for the reaction partners and an outlet with a gas-supply device to obtain a material, and quenching the material at the outlet opening of the plasma chamber with a gas stream which cools the material at a cooling rate of 10.sup.5 K/s to 10.sup.8 K/s to +50.degree. C. to +400.degree. C.; (b) cold pressing the indium-tin-oxide powder at a minimum pressure of 100 MPa; (c) placing the cold compact released from the first mold in a ceramic powder in a second mold, the ceramic powder having a maximum particle diameter of 250 .mu.m, and a melting point and a sintering temperature higher than +800.degree. C., the melting point of the second mold being higher than 800.degree. C. and the second mold being ductile under the conditions of a hot isostatic pressing; (d) sealing the second mold in a gastight manner; and (e) subjecting the wetted cold compact to hot isostatic pressing at a minimum temperature of +800.degree. C. and a minimum pressure of 20 MPa.

Process for making an indium-tin-oxide shaped body

A process for making a crystalline solid-solution powder which involves reacting at least two reactants in a plasma arc of a plasma chamber and blast-cooling the resultant product in a high velocity gas stream to form the powder. The first reactant is a molten metal alloy and the second reactant is a gas. The reaction is carried out in a plasma arc and the products rapidly cooled by a gas stream acting at the outlet opening of the plasma chamber. The crystalline solid-solution powder formed by the process has a low electrical resistivity. If an indium-tin alloy is used as the first reactant and oxygen as the second reactant, there is obtained an indium-tin-oxide (ITO) crystalline solid-solution powder which, when compacted to 40% of its theoretical density, has an electrical resistivity in the range of about 2 .OMEGA.cm. This ITO crystalline solid-solution powder is particularly suitable for preparing an ITO target, with high electrical conductivity and thus high achievable sputtering rates.

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Hanau, Germany

Marek Gorywoda