POWER DEFENSE THERMOELECTRIC MODULE
Interim rept. 3 July 1961-2 Nov 1962
TYCO LABS INC WALTHAM MA
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Efforts concerned optimizing the power-to-weight ratio of a lead telluride thermoelectric generator by developing bonding techniques and material preparation processes. A technique which utilizes a SnTe braze, was developed for bonding P and N-type PbTe to pure Fe electrodes. Contact resistances fall in the range of 5 - 15 micro-ohm per sq. cm. A bonding technique involving the interdiffusion of Fe and N-type PbTe at 850 C was developed. Contact resistances fall in the range 10 - 20 micro ohm per sq. cm. N-type PbTe directionally solidified under the influence of ultrasonic oscillations was found to possess mechanical properties superior to presently available material. Bonded and unbonded PbTe were found to be capable of sustaining, without any visible damage, a temperature gradient of 510 C for over 250 hours.
- Electric Power Production and Distribution