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Dilatometric Analysis of the Sintering Behavior of Bi2Te3 Thermoelectric Powders

Han Ju-Yeon, Byun Jong Min, Lee Young-In, Choi Byung Joon, Kim Hogyoung, Oh Sung-Tag

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 3

1117--1120

The sintering behavior of p-type bismuth telluride powder is investigated by means of dilatometric analysis. The alloy powders, prepared by ball milling of melt-spun ribbons, exhibit refined and flake shape. Differential thermal analysis reveals that the endothermic peak at about 280°C corresponds to the melting of bismuth, and peaks existing between 410°C and 510°C are presumably due to the oxidation and crystallization of the powder. The shrinkage behavior of ball-milled powders was strongly dependent of heating rate by the thermal effect exerted on specimens. In the case of 2°C/min, the peak temperature for the densification is measured at 406°C, while the peak temperature at a heating rate of 20°C/min is approximately 443°C. The relative density of specimen pressureless-sintered at 500°C exhibited relatively low value, and thus further study is required in order to increase the density of sintered body.