Patent ID: 6309695
Filing Date: 2001-10-30
Classification: G01K,G01L,H01C,Y10T

Abstract:
A process for the preparation of a thick film resistor useful for making strain gauge comprising:(a) cleaning an insulating substrate;(b) coating said substrate with a non-corrosive conductor thick film having a thickness of at least 10 microns;(c) drying the conductor coated substrate at a temperature of about 60-120 C. for at least 15 mins;(d) coating the prepared substrate with a resistor thick film having a thickness of at least 15 microns;(e) drying the resistor coated substrate at a temperature in the range of 60-120 C. for at least 15 mins to obtain a thick film resistor;(f) coating the prepared thick film resistor with a cyanometallic compound having a thickness in the range of 10-25 microns;(g) drying the compound coated substrate at a temperature in the range of about 60-120 C. for at least 10 mins; and(h) firing the prepared substrate to a temperature in the range of 800-900 C. for a period of 10-20 mins to obtain an improved thick film resistor useful for making strain gauge with enhanced gauge factor of from 0 to 1000.