Abstract A composition for use in thick film resistive elements having a low temperature coefficient of resistance is prepared by codepositing from an aqueous solution at least two precious metals one of which is ruthenium or iridium onto lead-containing glass frit, other metal components may also be deposited on the glass frit; prefiring the resulting glass frit at a temperature of at least about 600.degree.C., and preferably below the melting point of the precious metals deposited thereon; and comminuting the prefired glass frit to a size suitable to be formulated in a resistor paste to prepare thick film resistives. A particularly advantageous glass frit for application in thick film resistives has deposited thereon ruthenium or iridium, gold or platinum, and rhodium. Preferably, the composition is essentially free of silver.
A FINELY-DIVIDED CERAMIC MATERIAL HAVING A PRECIOUS METAL COMPONENTS AND SUITABLE FOR USE IN RESISTOR PASTES FOR MAKING THICK FILM RESISTORS COMPRISING LEAD-CONTAINING GLASS FRIT HAVING CODEPOSITED THEREON AN EFFECTIVE AMOUNT TO PROVIDE SAID RESISTOR, OF PRECIOUS METAL COMPONENTS CONSISTING ESSENTIALLY OF ABOUT 50 TO 95 PERCENT RUTHENIUM OR IRIDIUM, ABOUT 5 TO 20 PERCENT GOLD OR PLATINUM, AND ABOUT 5 TO 30 PERCENT RHODIUM.
Claim 2
Dependent Claim
65 words
A FINELY-DIVIDED CERAMIC MATERIAL HAVING A PRECIOUS METAL COMPONENTS AND SUITABLE FOR USE IN RESISTOR PASTES FOR MAKING THICK FILM RESISTORS COMPRISING LEAD-CONTAINING GLASS FRIT HAVING CODEPOSITED THEREON AN EFFECTIVE AMOUNT TO PROVIDE SAID RESISTOR, OF PRECIOUS METAL COMPONENTS CONSISTING ESSENTIALLY OF ABOUT 50 TO 95 PERCENT RUTHENIUM OR IRIDIUM, ABOUT 5 TO 20 PERCENT GOLD OR PLATINUM, AND ABOUT 5 TO 30 PERCENT RHODIUM.
Claim 3
Dependent Claim
14 words
The finely-divided ceramic material of claim 1 wherein the precious metal components contain ruthenium.
Claim 4
Dependent Claim
21 words
The finely-divided ceramic material of claim 2 wherein the rhodium is about 15 to 25 percent of the precious metal components.