Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1985-03-14
1987-01-27
Barr, Josephine L.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
338308, 252518, 252520, 427101, 4271262, 4271261, 4271264, 4273762, 4273763, 29620, H01B 106
Patent
active
046393919
ABSTRACT:
This invention relates to thick film base metal resistive paints for firing on a substrate to form a resistor having a temperature coefficient of resistance within .+-.100 ppm/.degree.C., while providing a means to selectively blend the resistive paint to provide a wide range of decade resistivities from less than 10 ohms/square to more than 1K ohms/square. The sheet resistance and TCR are controlled by mixing a glass frit from at least one of a first and second glass material; with TiSi.sub.2 ; and at least one of Ti.sub.5 Si.sub.3 and AL.sub.2 O.sub.3 ; and a screening agent, for subsequent screening onto a substrate and firing in an inert atmosphere at a peak temperature of about 900.degree. C. The first glass material comprises, by weight, 5 to 10% SiO.sub.2 ; 30 to 50% BaO; 40 to 60% B.sub.2 O.sub.3 and 1 to 5% CuO. The second glass material comprises, by weight, 50 to 70% B.sub.2 O.sub.3 ; 25 to 45% SrO; and 2 to 10% SiO.sub.2. The quantity of the glass material is increased to raise sheet resistance in ohms per square, and to lower the value of the TCR. The quantity of TiSi.sub.2 is increased to lower sheet resistance in ohms per square, and to raise the TCR. The quantity to TiSi.sub.2 is increased to lower sheet resistance in ohms per square, and to raise the TCR. The quantity of Ti.sub.5 Si.sub.3 is increased to lower the sheet resistance in ohms per square, and to lower the TCR. The quantity of Al.sub.2 O.sub.3 is increased to raise the sheet resistance in ohms per square, and to lower the TCR. The screening agent preferably has no carbon residue when pyrolytically decomposed during firing in an inert atmosphere.
REFERENCES:
patent: 2891914 (1959-06-01), Fenity et al.
patent: 3027332 (1962-03-01), Medin
patent: 3498832 (1970-03-01), Wilson
patent: 3661595 (1972-05-01), Buck
patent: 4039997 (1977-08-01), Huang et al.
patent: 4323484 (1982-04-01), Hattori et al.
"A Novel Conducting Glaze," Edna A. Dancy.
Barr Josephine L.
CTS Corporation
Flagg Rodger H.
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