PRECISION VOLUME RESISTOR.
Interim development rept. no. 5, 1 Jun-31 Aug 64,
INTERNATIONAL RESISTANCE CO PHILADELPHIA PA
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Resistors based on palladium or palladiumsilver dispersed in a ceramic matrix have been fabricated and their ranges and temperature coefficients measured. Pre-mil screening tests were completed. Termination methods for the solid slugs were investigated. A modified electroless cu-plating process was found acceptable and gave pull strengths of approximately 15 lbs. The fact that bismuth trioxide additions to the palladium-ceramic system shifts temperature coefficient towards negative values was established. The amount used in various ranges in order to minimize T. C. is under investigation. It has been determined that the Pd-ceramic system, of all the systems studied, offers the most promise of producing a volumetric resistor capable of MIL-R-10509D characteristic. For this reason all other phases of the program have been terminated and work will be concentrated on the Pd-ceramic system for the remainder of the contract. Author