PATE CONDUCTRICE POUR PLAQUETTES DE CIRCUITS IMPRIMES A PLUSIEURS COUCHES ET PROCEDE DE FABRICATION

• Main Author: KENJI OHSAWA, TAKAO ITO, KOICHIRO TANNO, MASAYUKI OHSAWA ET KEIJI KURATA
• Format: Patent
• Language: French
• Published: 02.07.1982
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CABLES; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CASTING; CHEMISTRY; CONDUCTORS; CURRENT COLLECTORS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; INSULATORS; LINE CONNECTORS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; PRINTED CIRCUITS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING ORDIELECTRIC PROPERTIES; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

A.PATE CONDUCTRICE POUR PLAQUETTES DE CIRCUITS IMPRIMES A PLUSIEURS COUCHES.B.PATE CONDUCTRICE CARACTERISEE EN CE QU'ELLE SE COMPOSE DE GALLIUM METALLIQUE COMBINE A UN PREMIER METAL QUI FORME UN EUTECTIQUE AVEC LE GALLIUM, CE METAL ETANT PRESENT EN EXCEDENT PAR RAPPORT A SA LIMITE DE SOLUBILITE DANS LE GALLIUM A LA TEMPERATURE PREDETERMINEE, ET EN COMBINAISON AVEC UNE POUDRE D'UN SECOND METAL SUSCEPTIBLE DE S'ALLIER AVEC LE GALLIUM, CETTE POUDRE ETANT REVETUE DU PREMIER METAL.C.L'INVENTION CONCERNE NOTAMMENT LA FABRICATION DE CIRCUITS IMPRIMES. A novel conductive paste and a method of making the same in which metallic gallium is combined with a metal or alloy which forms a eutectic with gallium in an amount in excess of its limit of solubility in gallium at a specific temperature. This melt is then treated with a metal powder of a second metal or alloy which alloys with gallium to produce a higher melting alloy, the second metal powder being coated on its surface with the eutectic-forming metal.