Termination for electrical resistor and method of making the same
First Claim
1. An electrical termination material comprising a mixture of a glass frit and a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium.
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Abstract
A termination material for a vitreous enamel electrical resistor includes a mixture of a glass frit and particles of either molybdenum, tungsten, tantalum or titanium. The termination material is applied to a substrate and fired to melt the glass frit, and then cooled to form a layer of the glass with the metal particles embedded therein. The termination material may be applied to the substrate either before or after the resistance material is applied to the substrate and is particularly useful with vitreous enamel resistance materials which include either a mixture of tantalum nitride and tantalum, a mixture of tungsten carbide and tungsten, or an alloy of copper and nickel.
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Citations
23 Claims
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1. An electrical termination material comprising a mixture of a glass frit and a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium.
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2. An electrical device including a substrate of an electrical insulating material and a termination area on a surface of said substrate, said termination area comprising a layer of glass having embedded therein a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium.
- 3. An electrical resistor comprising a substrate of an electrical insulating material, a pair of spaced termination areas on a surface of said substrate, each of said termination areas comprising a layer of glass having embedded therein a conductive phase, said conductive phase consisting essentially of particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and a resistance material layer on said surface of the substrate between and contacting said termination areas.
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10. A method of making an electrical device wherein a vitreous enamel termination composition is applied to a substrate comprising the steps of
preparing a vitreous enamel termination composition comprising a glass frit and a conductive phase, said conductive phase consisting essentially of finely divided conductive particles selected from the group consisting of molybdenum, tungsten, tantalum and titanium, applying a layer of the composition to an insulating substrate, firing the coated substrate in a non oxidizing atmosphere at a temperature sufficient to form an adherent vitreous composite, and cooling the coated substrate to form a termination thereon having a glass matrix with conductive particles dispersed therein.
- 16. An electrical termination material comprising a mixture of a glass frit and particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and in which the metal particles are present in the amount of 45% to 85% by volume.
- 18. An electrical device including a substrate of an electrical insulating material and a termination area on a surface of said substrate, said termination area comprising a layer of glass having embedded therein particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, and in which the metal particles are present in the termination area in the amount of 45% to 85% by volume.
- 20. An electrical resistor comprising a substrate of an electrical insulating material, a pair of spaced termination areas on a surface of said substrate, each of said termination areas comprising a layer of glass having embedded therein particles of a metal selected from the group consisting of molybdenum, tungsten, tantalum and titanium, the metal particles being present in the termination areas in the amount of 45% to 85% by volume, and a resistance material layer on said surface of the substrate between and contacting said termination areas.
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22. A method of making an electrical device wherein a vitreous enamel termination composition is applied to a substrate comprising the steps of
preparing a vitreous enamel termination composition comprising a glass frit and finely divided conductive particles selected from the group consisting of molybdenum, tungsten, tantalum and titanium, the metal particles of the termination composition being present in the amount to 45% to 85% by volume, applying a layer of the composition to an insulating substrate, firing the coated substrate in a non oxidizing atmosphere at a temperature sufficient to form an adherent vitreous composite, and cooling the coated substrate to form a termination thereon having a glass matrix with conductive particles dispersed therein.
Specification