PRECISION VOLUME RESISTOR.
Interim development rept. no. 3, 1 Dec 63-29 Feb 64,
INTERNATIONAL RESISTANCE CO PHILADELPHIA PA
Pagination or Media Count:
During the last period work was continued on the preparation of finely divided nickel powders for use in ceramic resistor systems. A study of the thermal decomposition of nickel formate in an autoclave at temperatures between 200C and 300C was carried out. To date, the smallest average particle size attained is 0.4 microns. Preparation methods and some electrical properties of aluminachromia-ceramic and vanadia-ceramic bodies have been investigated. In general, these systems have exhibited high voltage and temperature coefficients. Two ceramicconductor resistor systems have been prepared and partially evaluated. The first consists of Pd or PdAg powders dispersed in an alumina-glass matrix. With this system, T. C.s below 200 ppmC have been obtained in the range 2-10K omega. The second system, based on a mixture of palladium and carbon dispersed in an aluminaglass matrix has shown high negative T. C.s and relatively low resistance ranges. Author