Centre National De La Recherche Scientifique

Université Paul Sabatier (toulouse Iii)

Thales

Atochem

Michel Gougeon

Abel C Rousset

Philippe Tailhades

Olivier Vendier

Paul Mollard

Christiane B Salvaing

Lidwine Raynaud

Valérie Baco

Hoa Le Trong

Belaid Maachi

Bernard Gilot

A process for manufacturing a device comprising at least a support and a component, joined together by at least one braze, includes a brazing operation which is carried out starting from a metal oxalate. Advantageously, it is a silver oxalate or a mixture of silver and copper oxalates, the component and/or the support being covered with a film comprising gold or copper in contact with said braze and the component possibly being a power component.

Process for manufacturing a device comprising brazes produced from metal oxalate

Oxides having the spinel structure of .gamma.-Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4 type, substituted by trivalent and monovalent metals, or doped with non-spinel derivatives thereof, more particularly iron/aluminum/potassium oxides well suited as dehydrogenation catalysts, e.g., for dehydrogenating ethylbenzene into styrene, are prepared by thermally decomposing mixed iron, aluminum and potassium salts, notably the oxalates thereof, in the presence of air, then reducing the product of thermal decomposition at a temperature of less than 400.degree. C., advantageously in the presence of steam and hydrogen, and optionally oxidizing the product of reduction; oxides of .beta.-alumina structure are also produced.

.gamma.-Fe.sub.2 O.sub.3 /Fe.sub.3 O.sub.4 spinels

Compositions of particulate magnetic oxides with a defect spinel

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Toulouse, France

Michel Gougeon