Electrical resistor material, resistor made therefrom and method of making the same

A method of making electrical resistors providing selected resistivities within a wide range and with controlled temperature coefficients of resistance within .+-.2000 ppm/.degree.C. comprising the steps of

• mixing together in selected amounts a glass frit and conductive particles consisting essentially of tin oxide, the glass frit being present in the amount of 30% to 80% by volume,
• applying said mixture to a surface of a substrate,
• firing said coated substrate in an inert atmosphere to a selected temperature between approximately 850.degree. C. and 1150.degree. C. at which the glass softens but below the point at which the tin oxide melts, and
• cooling the coated substrate to form a layer of glass bonded to the substrate and having conductive particles of tin oxide embedded in and dispersed throughout the glass.

An electrical resistor of the vitreous enamel type providing a temperature coefficient of resistance within .+-.2000 ppm/.degree.C. made by

• mixing together in selected amounts a glass frit and conductive particles consisting essentially of tin oxide, the glass frit being present in the amount of 30% to 80% by volume,
• applying said mixture to a surface of a substrate,
• firing said coated substrate in an inert atmosphere to a temperature between approximately 850.degree. C. and 1150.degree. C. at which the glass softens and below the point at which the tin oxide melts, and
• cooling the coated substrate to form a layer of glass bonded to the substrate and having conductive particles of tin oxide embedded in and dispersed throughout the glass.