Production Facilities for Multi-Turn Metal-Film Trimmer Resistors Per Signal Corps Technical Requirements Scs-127 and MIL-R-22097b (Modified)

摘要

Methods for chemical analysis of all ingredients in the metallizing bath were developed and are being incorporated in the control procedure. The experimental effort for the bath variable study was completed with the exception of wear testing. The data has not been completely evaluated, however, useful information has been obtained. Certain additional work based on the partial results is already in progress. A number of heat treatments were tried to improve wear resistance. The results were encouraging but the ability to predictably reproduce satisfactory wear resistance has not been attained. A study was initiated on the effects of heat treatment and film wear on high temperature exposure tests. Sample 'O' rings were received and evaluated as a means of improving the seal on the potentiometer. Results to date are promising but further work is needed. (Author)