Process for the preparation of a thick film resistor useful for making strain gauge
AssigneeCouncil of Scientific and Industrial Research Rafi Marg
InventorAwatar Singh
Life of this patent
Estimating the term…
Abstract
This invention particularly relates to a thick film resistor and a process for the preparation of said thick firm resistor useful for making strain gauge with enhanced gauge factor upto 1000. The thick film resistor of the present invention is obtained by inducing the strain sensitivity in thick film resistor after its fabrication on substrate by coating it with a formulation capable of gauge factor enhancement and subjecting it to high temperature in furnace. The usage of thick film resistor have industrial applications such as hybrid circuit and thermistors etc.
Claims10
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.
Dependencies are inferred from the claim text.