Electricity: conductors and insulators – Conduits – cables or conductors – Preformed panel circuit arrangement
Patent
1989-08-07
1991-06-11
Nimmo, Morris H.
Electricity: conductors and insulators
Conduits, cables or conductors
Preformed panel circuit arrangement
174259, 174261, H05K 109
Patent
active
050234072
ABSTRACT:
A metal layer other than gold is formed on a ceramic substrate, a gold layer is further formed on said metal layer, and then a high density beam is applied to the treated substrate member. Thereby, the metal of the underlayer diffused through the grain boundaries of gold up to the surface of the gold layer by heat treatment or the like is uniformly mixed with gold to form an alloyed layer excellent in wettability to a solder. At the same time, nonmetallic impurities such as carbon adhering onto the surface of the gold layer are melted and removed.
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patent: 4786523 (1988-11-01), Dohya
Katayama Kaoru
Kazui Shinichi
Kobayashi Mamoru
Miyauchi Tateoki
Sasaki Hideaki
Hitachi , Ltd.
Nimmo Morris H.
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