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US 4,225,468 AGranted
Temperature coefficient of resistance modifiers for thick film resistors
AssigneeE. I. Du Pont de Nemours and Company
InventorsPaul C. Donohue, Sanford M. Marcus
Life of this patent
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Abstract
Temperature coefficient of resistance (TCR) modifiers, useful in thick film resistor compositions, which can be fired in nonoxidizing atmosphere and which are based on LaB.sub.6 and glass powders dispersed in a vehicle, are provided. Among such TCR modifiers are included TiO, Ge, Si, and graphite.
Claims6
A resistor composition consisting essentially of inorganic powder solids content dispersed in an organic vehicle wherein the solids content consists essentially of
- A. 1-20 parts by weight, based on the weight of the solids, of TCR modifier which is substantially nonreactive with and nonreducible by the conductive material selected from the group consisting of TiO, its higher oxidation state precursors Ti.sub.3 O.sub.5 and Ti.sub.2 O.sub.3 ;
- NbO;
- TaO;
- C;
- Si;
- Ge;
- SiC;
- compounds based on Groups IIIA and VA of the periodic chart of the elements;
- compounds based on Groups IIB and VIA of the periodic chart, rare earth nitrides and Group III B nitrides.
- B. 99-80 parts by weight, based on the weight of the solids, of
- a. 10-95 parts by weight, based on the weight of (a) plus (b), of conductive material selected from the group consisting of LaB.sub.6, YB.sub.6, rare earth hexaborides, CaB.sub.6, BaB.sub.6 and SrB.sub.6 ;
- and
- b. 90-5 parts by weight, based on the weight of (a) plus (b), of glass;
- and wherein the composition is compatible with copper conductors and is fireable in substantially nonoxidizing atmosphere.
11 more elements
Dependencies are inferred from the claim text.