Resistor material, resistor made therefrom and method of making the same
AssigneeTRW Inc.
InventorsRichard L. Wahlers, Kenneth M. Merz
Life of this patent
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Abstract
A vitreous enamel resistor material comprising a mixture of a vitreous glass frit and fine particles of a mixture of tin oxide (SnO.sub.2) and tantalum oxide (Ta.sub.2 O.sub.5). An electrical resistor is made from the resistor material by applying the material to a substrate and firing the coated substrate to a temperature at which the glass melts. The oxide mixture may be heat treated prior to mixing with the glass frit. Upon cooling, the substrate has on the surface thereof a film of the glass having the particles of the oxides embedded therein and dispersed therethroughout. The resistor material provides a resistor having a high resistivity and a low temperature coefficient of resistance.
Claims28
A vitreous enamel resistor material comprising a mixture of a glass frit and particles of a conductive phase, said conductive phase being selected from the group consisting essentially of (1) a mixture of tin oxide and tantalum oxide, and (2) a mixture of tin oxide, tantalum oxide and the products resulting from heat treatment of said mixture of tin oxide and tantalum oxide.
An electrical resistor comprising a ceramic substrate and a layer of a resistor material on a surface of said substrate, said resistor material comprising particles of a conductive phase selected from the group consisting essentially of (1) a mixture of tin oxide and tantalum oxide, and (2) a mixture of tin oxide, tantalum oxide and the products resulting from heat treatment of said mixture of tin oxide and tantalum oxide embedded in and dispersed throughout a glass.
A method of making an electrical resistor comprising the steps of
- mixing together a glass frit and fine particles of a conductive phase being selected from the group consisting essentially of (1) a mixture of tin oxide and tantalum oxide, and (2) a mixture of tin oxide, tantalum oxide and the products resulting from heat treatment of said mixture of tin oxide an tantalum oxide,
- applying said mixture to a surface of a substrate, and firing said coated substrate in a substantially inert atmosphere to the melting temperature of the glass frit.
An electrical resistor of the vitreous glaze type made by
- mixing together a glass frit and fine particles of a conductive phase being selected from the group consisting essentially of (1) a mixture of tin oxide and tantalum oxide, and (2) a mixture of tin oxide, tantalum oxide and the products resulting from heat treatment of said mixture of tin oxide and tantalum oxide,
- applying said mixture to a surface of a substrate, and firing said coated substrate in a substantially inert atmosphere to the melting temperature of the glass frit.
Dependencies are inferred from the claim text.