Compressive creep behaviour of hot-pressed PbTe. (June 2017)

• Record Type: Journal Article
• Authors: Li, C.C.; Snyder, G.J.; Dunand, D.C.
• Is Part Of: Scripta materialia. Number 134(2017)
• Page Start: 71
• Page End: 74
• Publication Date: 2017-06
• Subjects: Hot-pressing -- Compressive creep test -- Thermoelectric materials -- Creep; Materials -- Periodicals; Metallurgy -- Periodicals; Metalen; Legeringen; Materiaalkunde; Metals, metalworking and machinery industries; Metals; Electronic journals; 620.11
• DOI: 10.1016/j.scriptamat.2017.02.044
• Languages: English
• ISSNs: 1359-6462

Abstract

Abstract: Creep deformation is of concern in PbTe thermoelectric modules operating for years at high homologous temperatures while being subjected to internal or external stresses. The creep strain rates of hot-pressed PbTe are measured at 400 °C; a power-law is found, with a stress exponent n = 1.7 at low stresses (2–7 MPa) and n = 4.4 at high stresses (7–35 MPa). Creep rates measured at low stresses (4–6 MPa) between 350 and 500 °C provide a creep activation energy Q = 181 ± 18 kJ/mol. The creep parameters and the good hot ductility of PbTe are compared to those for cast Bi2 Te3 reported in the literature. Graphical abstract: