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THE EFFECTS OF POTASSIUM AND SODIUM CONTENTS IN THE CERAMIC SUBSTRATE ON THE LOAD LIVES OF FILM RESISTORS
FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
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Several film-resistor materials and the general requirements for the surface of the substrate are described. The insulation resistance of several substrates was measured. The effects of various substrates upon the load lives of three kinds of film resistors were investigated. It has been pointed out from the tests of the metal film resistor that the initial changes of the resistance were semipermanent on DC load and the electrochemical corrosion of the films was gradual and relatively long. This effect had much to do with the test conditions and could be slowed down by derating. The different of Na and K in the substrate showed quite different effects. This paper presents some possible methods for improving the DC aging performance of film resistors. By comparing the load lives of the newer and older substrates, it is considered to be very effective to add alkali-earth metal oxides as the flux for a ceramic substrate.
APPROVED FOR PUBLIC RELEASE