Correlation of Nonuniformities of the Seebeck Coefficient’s Distribution and the Strain-Stress State in Extruded Thermoelectric Material

2019 ◽  
Vol 822 ◽  
pp. 291-297
Author(s):  
Arseniy A. Rulimov ◽  
Daria D. Kuzavkova ◽  
Sergey A. Nemov ◽  
Alexandr Maksimovich Zolotov
Keyword(s):  
Stress State ◽  
Seebeck Coefficient ◽  
Thermoelectric Material ◽  
Software Package ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Molding Machine ◽  
Accumulated Strain ◽  
Strain Stress ◽  
P Type

In this work, p-type thermoelectric material was produced by hot extrusion of pre-synthesized in injection molding machine Bi0.5Sb1.5Te3 solid solution. During the research radial distribution of the Seebeck coefficient was confirmed and described in material’s cross section using thermal measuring probe. Such nonuniformity of the Seebeck coefficient is correlated with the strain-stress state of extrudate specifically with the distribution of accumulated strain intensity, which was obtained by mathematical modeling of extrusion process using the software package DEFORM.

scholarly journals Paper 1: “Cement as a Thermoelectric Material,” [J. Mater. Res. 15, 2844-2848 (2000)] And Paper 2: “Rectifying and Thermocouple Junctions Based on Portland Cement,” J. Mater. Res. 16, 1989-1993 (2001)]

2004 ◽  
Vol 19 (4) ◽  
pp. 1294-1294 ◽  
Author(s):  
Sihai Wen ◽  
D.D.L. Chung
Keyword(s):  
Portland Cement ◽  
Seebeck Coefficient ◽  
Thermoelectric Power ◽  
Carbon Fibers ◽  
Thermoelectric Material ◽  
Steel Fibers ◽  
Cement Pastes ◽  
The Absolute ◽  
P Type ◽  
Wrong Sign

In the two papers listed above, the conversion of the Seebeck coefficient (relative to copper) to the absolute thermoelectric power was done by using the wrong sign of the absolute thermoelectric power of copper (2.34 μV/°C). The corrected tables are shown below for both papers. The correction means that plain cement paste is slightly p-type rather than slightly n-type. In addition, it means that cement pastes with carbon fibers are more p-type and those with steel fibers are less n-type than reported. Note in Table III of Paper 2 that all cement pastes are p-type except for paste (ii). Note in Table IV of Paper 2 that all cement junctions are pn-junctions (rather than some being nn+-junctions).

Temperature Evolution and Optimization of Hot Extrusion Process for Al-Zn-Mg-Cu Aluminium Alloy Based on FEM Simulation

2012 ◽  
Vol 166-169 ◽  
pp. 896-901
Author(s):  
Lei Xu ◽  
Guang Ze Dai ◽  
Xing Min Huang ◽  
Jun Wen Zhao ◽  
Jing Han ◽  
...  
Keyword(s):  
Stress State ◽  
Fem Simulation ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Maximum Temperature ◽  
Tension Stress ◽  
Incipient Melting ◽  
Extrusion Speed ◽  
Cu Alloy ◽  
The Right

Hot extrusion process of Al-Zn-Mg-Cu alloy billet had been simulated under different temperature of billet and container. It was proposed that due to large deformation and friction, maximum temperature of the billet occurs on the skin near extrusion export and is under three direction tension stress state, where surface is likely to crack if temperature surpassed the incipient melting point. The right temperature of the billet and container is 425°C~450°C and 400°C respectively with the constant extrusion speed 0.8mm/s

Study of thin-sheet lap welding joint strain-stress state

2020 ◽  
pp. 295-300
Author(s):  
K.Yu. Trukhanov ◽  
V.V. Bulychev ◽  
M.I. Shatalov
Keyword(s):  
Stress State ◽  
Software Package ◽  
Welded Joint ◽  
Thin Sheet ◽  
Lap Joint ◽  
Ansys Software ◽  
Welding Joint ◽  
Lap Welding ◽  
Strain Stress ◽  
Joint Parameters

The results of steel sheet lap joint strain-stress state are presented. Welding joint parameters requirements are analyzed. The effect of 2 mm welded joint parameters and shape on the strain-stress state using ANSYS software package is studied.

Influence of Extrusion Temperature on the Thermoelectric Properties of p-Type Ag Added (Bi0.25Sb0.75)2Te3 Alloys Prepared by MA-PDS

2007 ◽  
Vol 336-338 ◽  
pp. 846-849
Author(s):  
Wang Kee Min ◽  
Chang Ho Lee ◽  
Yong Ho Park ◽  
Ik Min Park
Keyword(s):  
Thermoelectric Properties ◽  
Power Factor ◽  
Raw Materials ◽  
Pulse Discharge ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Extrusion Temperature ◽  
Mechanically Alloyed ◽  
P Type ◽  
Sintering Method

The direct extrusion process using the powder as raw materials was applied to prepare the thermoelectric materials. The mechanically alloyed powders of Ag added (Bi0.25Sb0.75)2Te3 were extruded by pulse discharge sintering method in the temperature range of 345°C ~ 425°C. High quality products were obtained by hot-extrusion method and their texture and thermoelectric properties were measured. The intensity of (110) plane increased with extrusion temperature up to 385°C and altered in the range of above 405°Cwhich coincided with the variation of power factor. The measured Power factor ranged from 3.5 ~ 4.0 × 10-3 W/K2·m. The figure of merit (Z) of the material extruded at 385°C was 3.1 × 10-3 /K, the highest value among the prepared materials.

Estimating Seebeck Coefficient of a p-Type High Temperature Thermoelectric Material Using Bee Algorithm Multi-layer Perception

2017 ◽  
Vol 46 (8) ◽  
pp. 4931-4938 ◽  
Author(s):  
Fatih Uysal ◽  
Enes Kilinc ◽  
Huseyin Kurt ◽  
Erdal Celik ◽  
Muharrem Dugenci ◽  
...  
Keyword(s):  
High Temperature ◽  
Seebeck Coefficient ◽  
Thermoelectric Material ◽  
Bee Algorithm ◽  
P Type

scholarly journals Regularities of Structure Formation in 30 mm Rods of Thermoelectric Material during Hot Extrusion

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7059
Author(s):  
Mikhail G. Lavrentev ◽  
Vladimir T. Bublik ◽  
Filipp O. Milovich ◽  
Viktoriya P. Panchenko ◽  
Yuri N. Parkhomenko ◽  
...  
Keyword(s):  
Thermoelectric Material ◽  
Figure Of Merit ◽  
Hot Extrusion ◽  
X Ray Diffraction ◽  
Extrusion Rate ◽  
Fine Grained ◽  
Axial Texture ◽  
Fine Grained Structure ◽  
P Type ◽  
Homogeneous Strain

In this study, Ingots of (Bi, Sb)2Te3 thermoelectric material with p-type conductivity have been obtained by hot extrusion. The main regularities of hot extrusion of 30 mm rods have been analyzed with the aid of a mathematical simulation on the basis of the joint use of elastic-plastic body approximations. The phase composition, texture and microstructure of the (Bi, Sb)2Te3 solid solutions have been studied using X-ray diffraction and scanning electron microscopy. The thermoelectric properties have been studied using the Harman method. We show that extrusion through a 30 mm diameter die produces a homogeneous strain. The extruded specimens exhibit a fine-grained structure and a clear axial texture in which the cleavage planes are parallel to the extrusion axis. The quantity of defects in the grains of the (Bi, Sb)2Te3 thermoelectric material decreases with an increase in the extrusion rate. An increase in the extrusion temperature leads to a decrease in the Seebeck coefficient and an increase in the electrical conductivity. The specimens extruded at 450 °C and a 0.5 mm/min extrusion rate have the highest thermoelectric figure of merit (Z = 3.2 × 10−3 K−1).

Analysis and optimization of hot extrusion process on strenx steel 900

2021 ◽  
Author(s):  
A. Damodar Reddy ◽  
P.N. Karthikeyan ◽  
S. Krishnaraj ◽  
Adarsh Ajayan ◽  
K. Sunil Kumar Reddy ◽  
...  
Keyword(s):  
Hot Extrusion ◽  
Extrusion Process

Interfacial reactions between pure Cu, Ni, and Ni–Cu alloys and p-type Bi2Te3 bulk thermoelectric material

2021 ◽  
Author(s):  
Masanori Tashiro ◽  
Sohei Sukenaga ◽  
Koichi Ikemoto ◽  
Kozo Shinoda ◽  
Tsuyoshi Kajitani ◽  
...  
Keyword(s):  
Thermoelectric Material ◽  
Interfacial Reactions ◽  
Cu Alloys ◽  
P Type ◽  
Pure Cu

Electronic Transport Properties of Hot-Pressed B6Si

1987 ◽  
Vol 97 ◽  
Author(s):  
C. Wood ◽  
D. Emin ◽  
R. S. Feigelson ◽  
I. D. R. Mackinnon
Keyword(s):  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Transport Properties ◽  
Electronic Transport ◽  
Hall Mobility ◽  
Anomalous Behavior ◽  
Nominal Composition ◽  
Electronic Transport Properties ◽  
Increasing Temperature ◽  
P Type

ABSTRACTMeasurements of the electrical conductivity, Seebeck coefficient and Hall mobility from -300 K to -1300 K have been carried out on multiphase hotpressed samples of the nominal composition B6Si. In all samples the conductivity and the p-type Seebeck coefficient both increase smoothly with increasing temperature. By themselves, these facts suggest small-polaronic hopping between inequivalent sites. The measured Hall mobilities are always low, but vary in sign. A possible explanation is offered for this anomalous behavior.

scholarly journals Friction-Induced Recycling Process for User-Specific Semi-Finished Product Production

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 663
Author(s):  
Thomas Borgert ◽  
Werner Homberg
Keyword(s):  
High Efficiency ◽  
Research Work ◽  
Hot Extrusion ◽  
Extrusion Process ◽  
Efficient Production ◽  
Secondary Aluminum ◽  
Shape Accuracy ◽  
Aluminum Chips ◽  
Spinning Process ◽  
Complex Parts

Modern forming processes often allow today the efficient production of complex parts. In order to increase the sustainability of forming processes it would be favorable if the forming of workpieces becomes possible using production waste. At the Chair of Forming and Machining Technology of the Paderborn University (LUF) research is presently conducted with the overall goal to produce workpieces directly from secondary aluminum (e.g., powder and chips). Therefore, friction-based forming processes like friction spinning (or cognate processes) are used due to their high efficiency. As a pre-step, the production of semi-finished parts was the subject of accorded research work at the LUF. Therefore, a friction-based hot extrusion process was used for the full recycling or rework of aluminum chips into profiles. Investigations of the recycled semi-finished products show that they are comparable to conventionally produced semi-finished products in terms of dimensional stability and shape accuracy. An analysis of the mechanical properties of hardness and tensile strength shows that a final product with good and homogeneously distributed properties can be produced. Furthermore, significant correlations to the friction spinning process could be found that are useful for the above-mentioned direct part production from secondary aluminum.

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