Mechanical Characterization of PbTe-based Thermoelectric Materials

2007 ◽  
Vol 1044 ◽  
Author(s):  
Fei Ren ◽  
Bradley D Hall ◽  
Jennifer E Ni ◽  
Eldon D Case ◽  
Joe Sootsman ◽  
...  
Keyword(s):  
Young’S Modulus ◽  
Thermal Loading ◽  
Powder Processing ◽  
Waste Heat ◽  
Young's Modulus ◽  
Mechanical Vibration ◽  
Testing Temperature ◽  
Type Specimens ◽  
Potential Applications ◽  
Resonant Ultrasound

AbstractPbTe-based thermoelectric (TE) materials exhibit promising thermoelectric properties and have potential applications in waste heat recovery from sources such as truck engines and shipboard engines. TE components designed for these applications will be subject to mechanical/thermal loading and vibration as a result from in-service conditions, including mechanical vibration, mechanical and/or thermal cycling, and thermal shock.In the current study, we present and discuss the mechanical properties of several PbTe-based compositions with different dopants and processing methods, including n-type and p-type specimens fabricated both by casting and by powder processing. Room temperature hardness and Young's modulus are studied by Vickers indentation and nanoindentation while fracture strength is obtained by biaxial flexure testing. Temperature dependent Young's modulus, shear modulus, and Poisson's ratio are studied via resonant ultrasound spectroscopy (RUS).

scholarly journals Novel Biobased Polyamide 410/Polyamide 6/CNT Nanocomposites

Polymers ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 986 ◽  
Author(s):  
Itziar Otaegi ◽  
Nora Aramburu ◽  
Alejandro Müller ◽  
Gonzalo Guerrica-Echevarría
Keyword(s):  
Young’S Modulus ◽  
Young's Modulus ◽  
Polyamide 6 ◽  
Multiwall Carbon Nanotube ◽  
Scanning Calorimetry ◽  
Melt Mixing ◽  
Good Dispersion ◽  
Maximum Conductivity ◽  
Twin Screw ◽  
Potential Applications

Biobased polyamide 410 (PA410)/multiwall carbon nanotube (CNT) nanocomposites (NCs) were obtained by melt-mixing in a twin screw extruder a Polyamide 6 (PA6)-based masterbatch (with 15 wt % CNT content) with neat PA410. Directly mixed PA410/CNT NCs were also obtained for comparison purposes. Transmision Electronic Microscopy (TEM) observation and conductivity measurements demonstrated that a good dispersion of CNTs was obtained, which was probably induced by the full miscibility between PA410 and PA6 (in the concentration range employed here), as ascertained by Differential Scanning Calorimetry (DSC) tests. As a result, the PA410/PA6/CNT NCs showed superior mechanical behaviour (≈10% Young’s modulus increase with a 4 wt % CNT content) than the binary PA410/CNT NCs (≈5% Young’s modulus increase with a 6 wt % CNT content), as well as superior electrical behaviour, with maximum conductivity values of approximately three orders of magnitude higher than in the binary PA410/CNT system, and lower percolation threshold values (0.65 wt % CNT content vs. 3.98 wt % CNT). The good dispersion and enhanced mechanical and electrical properties of these novel biobased nanocomposites, broadens their potential applications, such as electrical and electronics (E&E) or automotive industries.

scholarly journals The Mechanical Properties of Defective Graphyne

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 465 ◽  
Author(s):  
Shuting Lei ◽  
Qiang Cao ◽  
Xiao Geng ◽  
Yang Yang ◽  
Sheng Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Strain Rate ◽  
Young’S Modulus ◽  
Point Defects ◽  
Young's Modulus ◽  
Carbon Allotrope ◽  
Young’S Moduli ◽  
Potential Applications ◽  
Dynamics Simulations

Graphyne is a two-dimensional carbon allotrope with superior one-dimensional electronic properties to the “wonder material” graphene. In this study, via molecular dynamics simulations, we investigated the mechanical properties of α-, β-, δ-, and γ-graphynes with various type of point defects and cracks with regard to their promising applications in carbon-based electronic devices. The Young’s modulus and the tensile strength of the four kinds of graphyne were remarkably high, though still lower than graphene. Their Young’s moduli were insensitive to various types of point defects, in contrast to the tensile strength. When a crack slit was present, both the Young’s modulus and tensile strength dropped significantly. Furthermore, the Young’s modulus was hardly affected by the strain rate, indicating potential applications in some contexts where the strain rate is unstable, such as the installation of membranes.

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