Abstract
Evaporated nickel chromium films on glass and alumina substrates have been examined to ascertain their suitability for use as the resistance element of a variable resistor. Films on glass were found to have a life of the order of 10,000 cycles when worn by a light sliding contact; any electric current in the moving contact damaged the film reducing the life further. Films deposited on recrystallized alumina had better properties. A loading of the sliding contact of 1 mA at 45 V open circuit voltage produced no detectable electrical damage and under these conditions films withstood up to 10 6 cycles with little damage. It is proposed that the good wear resistant properties of nichrome films deposited on alumina result from strong adhesion of the film to a relatively unyielding substrate. The nature of the contact resistance is discussed.
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