Abstract
A powder metallurgy process for fabricating thermoelectric materials into tubular elements by rotary swaging is described. The relationships investigated in these studies were: 1. (1) The effects of powder preparation procedure on the thermoelectric properties of the swaged and sintered material. 2. (2) The effect of sintering temperature and time on the properties. 3. (3) The effect of density of loading of the materials in the sheathing on the required reduction of area in swaging. Results of swaging studies on n-type and p-type PbTe and Bi x Ge 1− x Te are reported. Results are also reported on the measurements of electrical resistivity, Seebeck coefficient and thermal conductivity of n-type and p-type PbTe swaged annular elements. Studies have also been made on the compatibility of lead telluride with a variety of cladding materials.
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