Vitreous enamel resistor and method of making the same
AssigneeTRW Inc.
InventorRobert G. Howell
Life of this patent
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Abstract
A vitreous enamel resistor, and method of making the same comprising the steps of applying to the surface of a substrate and firing a mixture of glass frit and particles of a precious metal oxide such as iridium oxide, ruthenium oxide, and mixtures thereof. The mixture is fired in a neutral, inert, or reducing atmosphere for a time and at a temperature resulting in a controlled partial dissociation of the oxide and softening of the glass frit. When cooled, a resistor is provided having a glass film with conductive particles therein strongly bonded to the substrate. The resistor produced can be terminated by the use of electroless plating.
Claims28
A method of making an electrical resistor comprising the steps of
- (a) coating the surface of an insulating substrate with a mixture of a glass frit and particles of a metal oxide selected from the group consisting of iridium oxide, ruthenium oxide, and mixtures thereof,
- (b) firing the mixture in an atmosphere and at a temperature to provide a controlled degree of dissociation of the oxide particles, and then
- (c) cooling the coated substrate to form a resistor film of glass having conductive particles dispersed therethrough and characterized by being terminable by an electroless plated metal film.
An electrical resistor made by the steps of
- (a) coating the surface of an insulating substrate with a mixture of a glass frit and particles of a metal oxide selected from the group consisting of iridium oxide, ruthenium oxide, and mixtures thereof,
- (b) firing the mixture in an atmosphere and at a temperature to provide a controlled degree of dissociation of the oxide particles, and then
- (c) cooling the coated substrate to form a resistor film of glass having conductive particles dispersed therethrough and characterized by being terminable by an electroless plated metal film.
An electrical resistor characterized by being terminable by an electroless plated metal film comprising an insulating substrate, and a glass film on a surface of the substrate, the glass film having particles of metal oxide selected from the group consisting of an oxide of iridium, an oxide of ruthenium, and mixtures thereof, together with particles of the metal of the oxide particles, embedded within and dispersed throughout the glass film, which the metal oxide and metal particles are present in an amount of 10 to 70% by weight.
Dependencies are inferred from the claim text.