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FABRICATION TECHNIQUE DEVELOPMENT IN - LINE THERMOELECTRIC GENERATOR MODULES
GENERAL INSTRUMENT CORP NEWARK NJ THERMOELECTRIC DIV
Three basic areas of thermoelectric generator technology were investigated in the first phase of this program bonding of positive polarity lead telluride, encapsulation of lead telluride and the heat transfer problems related to an in-line module. Bonding studies of P PbTe thermoelements indicated that further development effort is required to obtain a method giving low junction resistance and not causing stress induced cracking of the thermoelement. Of the methods studied the only promising results were with Metallic Rich Lead Telluride which, while stress induced thermoelement cracking was not observed, suffered a serious decrease in Seebeck coefficient as a function of operating time. If this problem could be overcome then this material could provide useful P thermoelements. The very limited development effort devoted to encapsulation demonstrated that the glass bonded synthetic micacement end seal encapsulant, while satisfactory in an inert atmosphere, did not provide thermoelement oxidation protection.
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