SOLID STATE THERMOSTATIC SWITCHES.
Final rept. 1 Feb-30 Sep 64.
HORIZONS INC CLEVELAND OHIO
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Thermostatic switches involving the resistance change upon melting of hydrated inorganic salts have been developed. Switches composed of a combination of either hydrated potassium fluoride or cobalt bromide together with a desiccant and nucleating agent have a switching temperature of 41C while a similar switch, in which the inorganic salt is hydrated cobalt chloride, has a switching temperature of 51C. A resistance change of several megohms to several hundred ohms occurs over a temperature increment of 2C at the switching temperature. These switches are capable of being recycled several dozen times and of being subjected to overtemperatures to 100C. Experimental work was performed in order to optimize the highly nonlinear resistance effect in doped ferroelectric materials as a thermostatic solid-state switch. The results were unsatisfactory for thermostatic switch applications in that the maximum temperature coefficient of resistance obtained was 10 percent per degree centigrade. Author
- Electrical and Electronic Equipment
- Solid State Physics