scholarly journals Mechanical and Thermoelectric Properties of Bulk AlSb Synthesized by Controlled Melting, Pulverizing and Subsequent Vacuum Hot Pressing

2019 ◽  
Vol 9 (8) ◽  
pp. 1609 ◽  
Author(s):  
A. K. M. Ashiquzzaman Shawon ◽  
Soon-Chul Ur
Keyword(s):  
Mechanical Properties ◽  
Intermetallic Compound ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Single Phase ◽  
Aluminum Antimonide ◽  
Simple Method ◽  
Group Iii ◽  
Indirect Band Gap ◽  
First Time

Aluminum antimonide is a semiconductor of the Group III-V order. With a wide indirect band gap, AlSb is one of the least discovered of this family of semiconductors. Bulk synthesis of AlSb has been reported on numerous occasions, but obtaining a single phase has always proven to be extremely difficult. This work reports a simple method for the synthesis of single-phase AlSb. Subsequently, consolidation was done into a near single-phase highly dense semiconductor in a form usable for thermoelectric applications. Further, the thermoelectric properties of this system are accounted for the first time. In addition, the mechanical properties of the intermetallic compound are briefly discussed for a possibility of further use.

scholarly journals One-step ultra-rapid fabrication and thermoelectric properties of Cu2Se bulk thermoelectric material

RSC Advances ◽  
2019 ◽  
Vol 9 (19) ◽  
pp. 10508-10519 ◽  
Author(s):  
Tiezheng Hu ◽  
Yonggao Yan ◽  
Si Wang ◽  
Xianli Su ◽  
Wei Liu ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermoelectric Properties ◽  
Single Phase ◽  
Temperature Synthesis ◽  
High Temperature Synthesis ◽  
Thermoelectric Energy ◽  
Rapid Fabrication ◽  
One Step ◽  
First Time

Cu2Se is a promising material for thermoelectric energy conversion. Fully dense single-phase bulk Cu2Se was prepared by the combination of self-propagating high-temperature synthesis with in situ quick pressing for the first time.

Microstructure Control of Co3AlC-Base Heat Resistant Alloys Using Optical Floating Zone Melting

2005 ◽  
Vol 475-479 ◽  
pp. 833-836 ◽  
Author(s):  
Yoshisato Kimura ◽  
Kiichi Sakai ◽  
Shinya Teramoto ◽  
Yoshinao Mishima
Keyword(s):  
Mechanical Properties ◽  
Single Phase ◽  
Zone Melting ◽  
Floating Zone ◽  
Compression Tests ◽  
Microstructure Control ◽  
Two Phase ◽  
Elevated Temperature Strength ◽  
Heat Resistant ◽  
First Time

Aiming for further improvement of mechanical properties of Co3AlC-based heat resistant alloys, microstructure control was conducted using optical floating zone (OFZ) melting. Unidirectional solidification was performed to align Co3AlC/a(Co) two-phase eutectic microstructure. Co3AlC single phase poly-crystal alloys were successfully fabricated for the first time by taking advantage of OFZ. Mechanical properties were evaluated for selected alloys by compression tests at ambient temperature, 1073 K and 1273 K. Excellent elevated temperature strength is achieved in Co3AlC single phase alloys and ductility is sufficiently improved in Co3AlC/a(Co) two-phase alloys.

Thermoelectric Properties of Nanostructured CoSb3 Synthesized by Mechanical Alloying

2007 ◽  
Vol 534-536 ◽  
pp. 1425-1428
Author(s):  
Soon Chul Ur ◽  
Joon Chul Kwon ◽  
Moon Kwan Choi ◽  
Soon Young Kweon ◽  
Tae Whan Hong ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Mechanical Alloying ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Figure Of Merit ◽  
Single Phase ◽  
Phonon Scattering ◽  
Stoichiometric Composition ◽  
Processing Route ◽  
Vacuum Hot Pressing

Undoped CoSb3 powders were synthesized by mechanical alloying of elemental powders using a nominal stoichiometric composition. Nanostructured, single-phase skutterudite CoSb3 was successfully produced by vacuum hot pressing using as-milled powders without subsequent annealing. Phase transformations during synthesis were investigated using XRD, and microstructure was observed using SEM and TEM. Thermoelectric properties in terms of Seebeck coefficient, electrical conductivity, thermal conductivity and figure of merit were systematically measured and compared with the results of analogous studies. Lattice thermal conductivity was reduced owing to increasing phonon scattering in nanostructured CoSb3, leading to enhancement in the thermoelectric figure of merit. Mechanical Alloying associated with vacuum hot pressing technique offers an alternative potential processing route for the production of skutterudites.

Optimizing the Mechanical Properties of Wood Plastic Composites Using Fiber-Glass

2011 ◽  
Author(s):  
Mahdi Ashrafi ◽  
Masoud Olia ◽  
Ashkan Vaziri ◽  
Hamid Nayeb-Hashemi
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Volume Fraction ◽  
Short Fiber ◽  
Unidirectional Composite ◽  
Fiber Glass ◽  
Simple Method ◽  
Wood Plastic Composites ◽  
Wood Volume ◽  
Plastic Composites

Wood plastic composites (WPC) are widely used in the industry due to its durability, low cost, and anti-moisture properties in comparison with the natural wood. Recently, WPC are also being considered in musical instrument industry. In this research, we have produced flout shaped WPC samples using African black wood powder and Phenolic resin in a hot compression molding set-up. Initial WPC composites were produced by systematically changing the wood volume fraction. The results showed cracks developed in composites with more than 70% wood. This was related to formation of gas in the system during manufacturing and lack of fluidity in the system to flush the gases. Based on these results the optimum temperature, pressure and wood volume fraction for developing WPC in a form of a flute is developed. A series of experimental procedures were performed to improve mechanical properties of WPC samples by studying the effect short fiber-glass addition to the wood matrix prior to hot pressing. The results showed that the addition of short fiber did not improve the strength of WPC but rather than it reduced its strength compared to unreinforced composite. This was attributed to lack of bonding between short fibers and wood matrix. In contrast encapsulated wood particle composite in an E-glass/epoxy composite sheet before hot pressing showed the mechanical properties of wood composite are enhanced. A two layer unidirectional composite was sufficient for producing flute with desirable mechanical properties. On the basis of the experimental results, a very simple method to enhance the load-bearing capability of WPC which may allow producing reinforced WPC in the form of flout shape is developed.

Fabrication of Homogeneous Bulk Nanocrystalline Ni-W Alloys by an Electroforming Process

2007 ◽  
Vol 26-28 ◽  
pp. 691-694 ◽  
Author(s):  
Akari Fujii ◽  
Yoshihisa Kimoto ◽  
Shin Wakayama ◽  
Yorinobu Takigawa ◽  
Tokuteru Uesugi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Concentration Gradient ◽  
Single Phase ◽  
Concentration Profiles ◽  
Electroforming Process ◽  
Bulk Nanocrystalline ◽  
Micrometer Scale ◽  
First Time

Many studies have been conducted on mechanical properties in nanocrystalline Ni-W alloys. However, since these results are obtained in the specimens whose thickness is less than 100 μm and whose homogeneity is not strictly controlled, an inherent potential of the nanocrystalline Ni-W alloy may be hidden. Therefore, it is necessary to fabricate the bulk Ni-W alloy with sufficient thickness and homogeneity. In the present study, we develop novel electroforming process and fabricate the homogeneous nanocrystalline Ni-W alloys. The homogeneities of W-concentration in micrometer scale are confirmed by the W-concentration profiles obtained by the linear analyses of the energy dispersed spectroscopy (EDS). The single-phase nanocrystalline bulk Ni-W alloy with the thickness above 2 mm and minimized W-concentration gradient and fluctuation is featured for the first time.

Synthesis of single-phase Cr7C3 bulk with phenolic resin addition by hot pressing and its mechanical properties

2017 ◽  
Vol 4 (8) ◽  
pp. 086504
Author(s):  
Lei Zhang ◽  
Zhifu Huang ◽  
Li Chang ◽  
Baochao Zheng ◽  
Zhiwei Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hot Pressing ◽  
Single Phase ◽  
Phenolic Resin

Thermoelectric Properties of Fe-Doped CoSb3 Prepared by Encapsulated Induction Melting and Hot Pressing

2007 ◽  
Vol 534-536 ◽  
pp. 1557-1560 ◽  
Author(s):  
Kwan Ho Park ◽  
Jung Il Lee ◽  
Soon Chul Ur ◽  
Il Ho Kim
Keyword(s):  
Heat Treatment ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Single Phase ◽  
Electron Acceptors ◽  
Subsequent Heat Treatment ◽  
Optimum Composition ◽  
Induction Melting

The encapsulated induction melting and hot pressing were employed to prepare the Fedoped CoSb3 skutterudites and their thermoelectric properties were investigated. Single phase δ- CoSb3 was successfully obtained by the subsequent heat treatment at 773K for 24 hours. Iron atoms acted as electron acceptors by substituting cobalt atoms. Thermoelectric properties were remarkably improved by the appropriate doping. Co0.7Fe0.3Sb3 was found as an optimum composition for best thermoelectric properties in this work.

Thermoelectric Properties of Ni-Doped CoSb3 Prepared by Encapsulated Induction Melting and Hot Pressing

2007 ◽  
Vol 534-536 ◽  
pp. 1561-1564 ◽  
Author(s):  
Mi Jung Kim ◽  
Jung Il Lee ◽  
Soon Chul Ur ◽  
Il Ho Kim
Keyword(s):  
Heat Treatment ◽  
Thermoelectric Properties ◽  
Hot Pressing ◽  
Single Phase ◽  
Subsequent Heat Treatment ◽  
Electron Donors ◽  
Induction Melting ◽  
Doping Effects

Ni-doped CoSb3 was prepared by the encapsulated induction melting and hot pressing, and its doping effects on the thermoelectric properties were investigated. Single phase δ-CoSb3 was successfully obtained by the subsequent heat treatment at 773K for 24 hours. Nickel atoms acted as electron donors by substituting cobalt atoms. Thermoelectric properties were remarkably improved by the appropriate doping.

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