Apparatus for electrophoretic deposition

Abstract

Abstract AN APPARATUS FOR THE ELECTROPHORETIC DEPOSITION OF GLASS INCLUDING A CASING WHICH DEFINES A DEPOSITION CHAMBER AND A SETTLING CHAMBER WHICH COMMUNICATES WITH THE DEPOSITION CHAMBER. THE METAL ARTICLE TO BE COATED IS MADE ANANODE IN AN ELECTRICAL CIRCUIT AND IS LOCATED IN THE DEPOSITION CHAMBER ALONG WITH A CATHODE. GLASS SLIP, WHICH IS A WATER SUSPENSION OF GLASS FRIT PARTICLES, CLAYS AND MILL ADDITIONS, IS USED TO FILL THE DEPOSITION CHAMBER AND IS ADDED CONTINUOUSLY TO REPLACE THOSE SOLIDS REMOVED DURING THE COATING OPERATION. A VOLTAGE IS APPLIED ACROSS THE CIRCUIT AND THE GLASS PARTICLES AND CLAYS ARE DEPOSITED ON THE METAL WORKPIECE. IN ADDITION, A PROVISION IS MADE TO CONTINUOUSLY DEIONIZE THE LIQUID OR WATER PHASE OF THE GLASS SLIP. THE GLASS FRIT PARTICLES SETTLE OUT THE SETTLING CHAMBER ON A SERIES OF SPACED, GENERALLY PARALLEL PLATES WHICH ARE LOCATED AT AN ANGLE OF 50* TO 90* WITH RESPECT TO THE HORIZONTAL. RELATIVELY GLASS-FREE LIQUID IS WITHDRAWN FROM THE UPPER END OF THE SETTLING CHAMBER, PASSED THROUGH A SERIES OF ION EXCHANGE COLUMNS AND THE DEIONIZED LIQUID IS RETURNED TO THE DEPOSTION CHAMBER, WHILE THE GLASS FRIT PARTICLES, WHICH HAVE SETTLED OUT, FLOW DOWNWARDLY FROM THE SETTLING CHAMBER AND ARE ALSO RETURNED TO THE DEPOSITION CHAMBER.

Inventors

• 👤 Donald I Lusk

Bibliographic Details