DIFFUSION BONDING OF ALUMINIUM AND ALUMINIUM ALLOYS

The diffusion bonding of aluminium and aluminium alloys presents problems because , when left exposed to the atmosphere even for a short time, they acquire an extremely tenacious surface oxide layer that inhibits or prevents satisfactory diffusion bonding. Unlike titanium, this oxide layer is not ab...

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Hauptverfasser:	BOTTOMLEY, IAN, BRITISH AEROSPACE DEFENCE LTD, SOMERTON, CHRISTOPHER, BRITISH AEROSPACE PLC, HARRIS, STEVEN JOHN, BRITISH AEROSPACE PLC, STRICKLAND, GEORGE, BRITISH AEROSPACE DEFENCE LTD
Format:	Patent
Sprache:	eng
Schlagworte:	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 CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR METALLURGY PERFORMING OPERATIONS SOLDERING OR UNSOLDERING SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	The diffusion bonding of aluminium and aluminium alloys presents problems because , when left exposed to the atmosphere even for a short time, they acquire an extremely tenacious surface oxide layer that inhibits or prevents satisfactory diffusion bonding. Unlike titanium, this oxide layer is not absorbed at diffusion bonding temperatures. The present invention comprises a method of reducing oxidation of a surface of aluminium or aluminium alloy (10) by causing a nitride film to form on the surface. This film is believed to prevent oxidation of the aluminium or aluminium alloy, but to be absorbable into it at diffusion bonding temperatures. The nitride film is applied to the piece of aluminium or aluminium alloy (10) in a vacuum chamber (4) by sputtering with nitrogen ions, or by heating the piece (10) in a nitrogen gas atmosphere.