H - Electricity – 05 – K
Patent
H - Electricity
05
K
356/12
H05K 1/09 (2006.01) H05K 3/12 (2006.01) H05K 3/24 (2006.01) H05K 3/28 (2006.01) H05K 1/03 (2006.01)
Patent
CA 1148666
467 CANADA PROCESS FOR AIR FIRING OXIDIZABLE CONDUCTORS AND A RESULTING PRINTED THICK FILM CONSTRUCTION ABSTRACT OF THE INVENTION A thick film is formed initially as a paste and made up of such oxidizable conductor ingredients as copper which is then mixed with glass frit and next printed on a non-conductive inert substrate by silk screening. The silk screen printed thick film with vehicle is then dried, and a coating of boron in suitable paste or paint form having been mixed with a thixotropic organic vehicle is covered over the entirety of the substrate and silk screen printed thick film. The resulting product after a second air drying is then fired to bond the glass frit-copper as a thick film on-to the substrate, with the copper particles being sintered throughout into a thick film. Superposed boron, where contiguous with the copper printing, is fused as a protective layer over the copper allowing the sintering of the copper and bonding with the substrate to occur without oxidation of the copper. Oxidized boron that covers portions of the substrate not occupied by the thick film and not super- posing the copper layer is then washed away and the boron bonded to the copper remains as a protective coating.
369380
Cts Corporation
George H. Riches And Associates
LandOfFree
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