Resistors Screen Printed on Ceramic-Coated Steel Substrates

Steel substrates covered with ceramic insulating coating were tested for their ability to be used in thick film technology. The first intermediate ground coating was prepared by means of a special glass powder applied to the steel sheet and was fired at temperatures up to 960°C. The final coating was produced by screen printing or by some other method from a dielectric composition and fired at 800°C960°C. Various conductor and resistor compositions were screen printed on the substrates mentioned above and fired up to the required temperatures (650°C-860°C). By the above method, resistors with a relatively low temperature coefficient of resistance and a suitable long-term stability were achieved. Ceramic-coated steel substrates, unlike enameled substrates, make possible the application of resistor compositions designed for use on ceramic substrates.