Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1980-10-06
1982-02-23
Herbert, Jr., Thomas J.
Stock material or miscellaneous articles
Composite
Of quartz or glass
338307, 338314, 427 96, 427101, 427102, 427103, 428457, 428469, 428901, B32B 1520, B05D 512, H01C 1012
Patent
active
043169422
ABSTRACT:
A method for producing a thick film circuit (30) including a copper conductor pattern (19), thereby obviating the need for expensive precious metal compositions. In the process, a fritted copper paint (16) is applied to a ceramic substrate (18) and fired at a temperature of 850.degree. C. to 950.degree. C. and is oxidized. Concurrently, the paint (16) is adhesively joined to the nonreactive and nonconductive ceramic substrate (18). Next, a resistor paint (20) is applied in overlapping relationship with the air-heated copper conductor pattern (19) and fired at 850.degree. C. to 950.degree. C. The entire unit is then fired in a reducing atmosphere at a temperature of 260.degree. C. to 450.degree. C. to reduce the oxidized copper. The air-fired resistor pattern (21) can either be protected by a coating (40) or unprotected during the reducing atmosphere firing. The essential ingredients of the copper paint (16) are a frit (12) that is non-reducible under a hydrogen atmosphere, a copper powder (10) and a suitable screening agent ( 14).
In this new and improved three-step firing process, the copper conductors are compatible with existing ruthenium base resistors.
REFERENCES:
patent: 3998980 (1976-12-01), Antes et al.
patent: 4140817 (1979-02-01), Brown
patent: 4255291 (1981-03-01), Needes et al.
CTS Corporation
Herbert, Jr. Thomas J.
Palguta Larry J.
Young John A.
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