Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1988-04-13
1989-10-31
Beck, Shrive
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
427423, 75 1019, 20419238, B05D 108
Patent
active
048776408
ABSTRACT:
Metal particles in powdered form are cleaned of oxides by a method in which the particles are introduced into a plasma stream in the presence of a continuous negative transfer arc. Ionization of a gas within a plasma gun produces a plasma stream into which the metal particles are introduced at a location within the plasma gun. A negative transfer arc power source is continuously coupled between the plasma gun and a cathode downstream of the plasma gun and within the plasma stream to remove oxide coatings from the metal particles as they travel along the plasma stream to either a receptacle located downstream from the cathode or to a substrate which forms the cathode and onto which a relatively oxide-free coating is formed by the metal particles. Such methods of oxide removal are particularly effective with highly oxidizable refractory materials such as titanium, tantalum and aluminum.
REFERENCES:
patent: 3429691 (1969-02-01), McLaughlin
patent: 3839618 (1974-10-01), Muehlberger et al.
patent: 3989511 (1976-11-01), Fey et al.
patent: 4328257 (1982-05-01), Muehlberger et al.
patent: 4784159 (1988-11-01), Szilagyi
Muehlberger Erich
Sickinger Albert
Beck Shrive
Electro-Plasma, Inc.
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