Accession Number:

AD0606704

Title:

PRECISION VOLUME RESISTOR.

Descriptive Note:

Interim development rept. no. 4, 1 Mar-31 May 64,

Corporate Author:

INTERNATIONAL RESISTANCE CO PHILADELPHIA PA

Personal Author(s):

Report Date:

1964-06-20

Pagination or Media Count:

60.0

Abstract:

Nickel powders for use as the conductive phase in dispersed metal-ceramic resistor systems have been prepared with particle sizes in the range 0.2 - 0.7 microns. Copper and coprecipitated copper-nickel powders have also been prepared and used in the fabrication of pressed resistor bodies. Test samples have been prepared using as the insulating phase cordierite, alumina and magnesia in order to investigate the effect of thermal expansion differences on resistance and temperature coefficient of resistance. Data is not yet available. Resistor bodies have been made and electrical measurements taken on compositions based on V2O3. Large negative temperature coefficients have been observed which were found to be due to the presence of V2O4. Resistors based on carbon, palladium, alumina and glass have been fabricated and range and T. C. measured. An increase in resistance with an increase in conductor content has been found to be due to a reaction between Pd, C and silica to form Pd2Si at temperatures above approximately 1000 C. New formulations which mature below 1000 C are under investigation as well as the use of glasses which do not contain silica. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE