Importance

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Abstract

A temperature sensitive thick film resistor unit for use in detecting and control systems is formed employing thick film plating technology. A final sized negative is formed from enlarged artwork and transferred to a photosensitive emulsion supported on a stainless steel screen to form a printing stencil. A fritted molecular bonding nickel paste including finely divided vitreous and nickel particles in a solvent carrier is screen printed onto an alumina substrate by a pressure printer in which the paste is forced through the screen to control the thickness of the deposited nickel paste. The deposited nickel is allowed to settle and partially heated to remove gases and organic solvents. A highly conductive film is overlaid on tab connecting ends and the unit is fired to intimately attach the nickel paste to the substrate by the formation of a chemical bond. Nickel in appropriate form for printing is a readily available material and also provides a significant and linear change in resistance per unit of temperature change.

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First Claim