Dilatometric analysis of the sintering behavior of Bi2Te3 thermoelectric powders

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

doi:10.24425/amm.2020.133227

Dilatometric analysis of the sintering behavior of Bi₂Te₃ thermoelectric powders

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

Seoul National University of Science and Technology (SNUST)

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

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^oC corresponds to the melting of bismuth, and peaks existing between 410^oC and 510^oC 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^oC/min, the peak temperature for the densification is measured at 406^oC, while the peak temperature at a heating rate of 20^oC/min is approximately 443^oC. The relative density of specimen pressureless-sintered at 500^oC exhibited relatively low value, and thus further study is required in order to increase the density of sintered body.

Original language	English
Pages (from-to)	1117-1120
Number of pages	4
Journal	Archives of Metallurgy and Materials
Volume	65
Issue number	3
DOIs	https://doi.org/10.24425/amm.2020.133227
State	Published - 2020

Keywords

BiTe
Dilatometric analysis
Microstructure
Sintering behavior

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10.24425/amm.2020.133227

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title = "Dilatometric analysis of the sintering behavior of Bi2Te3 thermoelectric powders",

abstract = "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 280oC corresponds to the melting of bismuth, and peaks existing between 410oC and 510oC 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 2oC/min, the peak temperature for the densification is measured at 406oC, while the peak temperature at a heating rate of 20oC/min is approximately 443oC. The relative density of specimen pressureless-sintered at 500oC exhibited relatively low value, and thus further study is required in order to increase the density of sintered body.",

keywords = "BiTe, Dilatometric analysis, Microstructure, Sintering behavior",

author = "Han, \{Ju Yeon\} and Byun, \{Jong Min\} and Lee, \{Young In\} and Choi, \{Byung Joon\} and Hogyoung Kim and Oh, \{Sung Tag\}",

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AU - Han, Ju Yeon

AU - Byun, Jong Min

AU - Lee, Young In

AU - Choi, Byung Joon

AU - Kim, Hogyoung

AU - Oh, Sung Tag

N1 - Publisher Copyright: © 2020. The Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial License (CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/deed.en which permits the use, redistribution of the material in any medium or format, transforming and building upon the material, provided that the article is properly cited, the use is noncommercial, and no modifications or adaptations are made.

PY - 2020

Y1 - 2020

N2 - 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 280oC corresponds to the melting of bismuth, and peaks existing between 410oC and 510oC 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 2oC/min, the peak temperature for the densification is measured at 406oC, while the peak temperature at a heating rate of 20oC/min is approximately 443oC. The relative density of specimen pressureless-sintered at 500oC exhibited relatively low value, and thus further study is required in order to increase the density of sintered body.

AB - 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 280oC corresponds to the melting of bismuth, and peaks existing between 410oC and 510oC 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 2oC/min, the peak temperature for the densification is measured at 406oC, while the peak temperature at a heating rate of 20oC/min is approximately 443oC. The relative density of specimen pressureless-sintered at 500oC exhibited relatively low value, and thus further study is required in order to increase the density of sintered body.

KW - BiTe

KW - Dilatometric analysis

KW - Microstructure

KW - Sintering behavior

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DO - 10.24425/amm.2020.133227

M3 - Article

AN - SCOPUS:85086235489

SN - 1733-3490

VL - 65

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EP - 1120

JO - Archives of Metallurgy and Materials

JF - Archives of Metallurgy and Materials

IS - 3

ER -

Dilatometric analysis of the sintering behavior of Bi₂Te₃ thermoelectric powders

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Keywords

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