Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1997-11-26
2000-03-14
Jones, Deborah
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428432, 428697, 428699, 174257, 174258, B32B 900
Patent
active
060370459
ABSTRACT:
A ceramic circuit element comprising a ceramic substrate having co-fired resistor and glass overcoat thereon in which the resistor is formed from a resistor paste consisting essentially of RuO.sub.2 powder, glass powder and a vehicle comprising an organic polymer and a solvent, the RuO.sub.2 powder and the glass powder having specific surface areas of 10 to 20 m.sup.2 /g and 4 to 14 m.sup.2 /g, respectively; the glass overcoat is formed from a glass overcoat paste consisting essentially of a glass composition and a vehicle comprising an organic polymer and a solvent, the glass composition having a specific surface area of 2 to 6 m.sup.2 /g; and the ceramic circuit substrate comprises a CaO--Al.sub.2 O.sub.3 --SiO.sub.2 --B.sub.2 O.sub.3 system or MgO--Al.sub.2 O.sub.3 --SiO.sub.2 --B.sub.2 O.sub.3 system glass and alumina. The use of the foregoing resistor and glass overcoat pastes minimizes the bubbles remaining in the resistor and realizes the exertion of resistance performance ensuring excellent weather resistance and stability, even after the resistor is subjected to trimming.
REFERENCES:
patent: 5004640 (1991-04-01), Nakatani et al.
patent: 5264272 (1993-11-01), Tanabe et al.
patent: 5514451 (1996-05-01), Kumar et al.
patent: 5562973 (1996-10-01), Nagasaka et al.
Jones Deborah
Lam Cathy F.
Sumitomo Metal (SMI) Electronics Devices Inc.
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