VERFAHREN ZUR HERSTELLUNG EINER ATMOSPHÄRE ZUR THERMISCHEN BEHANDLUNG DURCH LUFTTRENNUNG DURCH ADSORPTION

The invention relates to a process for producing an atmosphere for thermal treatment of metals, formed by providing a gaseous nitrogen stream, according to which a crude gaseous nitrogen stream having a residual oxygen content is first formed by air separation by selective adsorption, to which strea...

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Bibliographische Detailangaben
Hauptverfasser:	DUCHATEAU, ERIC, QUEILLE, PHILIPPE
Format:	Patent
Sprache:	ger
Schlagworte:	ALLOYS CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMICAL SURFACE TREATMENT CHEMISTRY CLADDING OR PLATING BY SOLDERING OR WELDING COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL COMPOUNDS THEREOF CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DIFFUSION TREATMENT OF METALLIC MATERIAL FERROUS OR NON-FERROUS ALLOYS GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL INORGANIC CHEMISTRY MACHINE TOOLS MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY METALLURGY OF IRON MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL SEPARATION SOLDERING OR UNSOLDERING SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	The invention relates to a process for producing an atmosphere for thermal treatment of metals, formed by providing a gaseous nitrogen stream, according to which a crude gaseous nitrogen stream having a residual oxygen content is first formed by air separation by selective adsorption, to which stream is added a stream of hydrogen at least sufficient to remove, by water vapour formation by catalytic reaction, the essential part of the residual oxygen, characterised in that the following measures are employed in combination: a) the air separation by selective adsorption is carried out so that the gaseous nitrogen stream has a residual oxygen content of between 0.1% and 3%; b) the catalytic reaction to form water vapour is brought about exclusively with catalysts whose use does not involve external application of heat and c) the catalytic reaction to form water vapour is carried out in such a way that the residual oxygen content is less than 30 vpm, with a water vapour content of between 0.2% and 6%, relative to the nitrogen stream, being set up. Exclusive application to the annealing or brazing of copper, decarburising annealing of steels, nitriding of steels, and sintering of copper, nickel, copper-nickel alloys, where appropriate with lead, and copper-zinc alloy.