METHOD FOR FORMING POROUS LAYER ON SURFACE OF METALLIC BODY

PURPOSE:To form a porous layer having excellent heat transmission performance by coating higher alcohol on the cleaned surface of a metal and further sticking a mixture composed of metallic powder and brazing material powder then subjecting the metal to brazing by heating in a nonoxidative atmospher...

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Bibliographische Detailangaben
1. Verfasser:	KATOUGI TAKESHI
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS 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 FERROUS OR NON-FERROUS ALLOYS 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 TREATMENT OF ALLOYS OR NON-FERROUS METALS WELDING WORKING BY LASER BEAM
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Beschreibung
Zusammenfassung:	PURPOSE:To form a porous layer having excellent heat transmission performance by coating higher alcohol on the cleaned surface of a metal and further sticking a mixture composed of metallic powder and brazing material powder then subjecting the metal to brazing by heating in a nonoxidative atmosphere. CONSTITUTION:The surface of a metallic material of Al, etc. is defatted and cleaned and thereafter higher alcohol such as hexyl alcohol, octyl alcohol, cetyl alcohol or the like is uniformly coated thereon. A powder mixture composed of powder of Al, etc. and Al-Si-Mg alloy powder as a brazing material is coated and stuck uniformly onto the surface coated thereon with the higher alcohol. Such metallic material is heated to about 605 deg.C in a nonoxidative or reducing atmosphere to braze the Al powder by the brazing material. The porous layer having much ruggedness and excellent heat transmission characteristics is formed on the surface.