The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 1987
Filed:
Mar. 14, 1985
Charles C Kuo, Elkhart, IN (US);
CTS Corporation, Elkhart, IN (US);
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.