Au as an acceptor in thermoelectric Bi1Sb3Te6 alloy prepared by mechanical alloying and pulse discharge sintering process

2004 ◽  
Vol 96 (7) ◽  
pp. 3852-3856 ◽  
Author(s):  
Changho Lee ◽  
Yong-Ho Park ◽  
Hitoshi Hashimoto
Keyword(s):  
Mechanical Alloying ◽  
Pulse Discharge ◽  
Sintering Process

Thermoelectric Properties of Bi2Te3-Sb2Te3 Compounds Prepared by Ma-Pulse Discharge Sintering Process

1999 ◽  
Vol 581 ◽  
Author(s):  
R.E. Park ◽  
Y.H. Park ◽  
T. Abe
Keyword(s):  
Thermal Conductivity ◽  
Electrical Resistivity ◽  
Mechanical Alloying ◽  
Figure Of Merit ◽  
Room Temperature ◽  
Pulse Discharge ◽  
Sintering Process ◽  
Mechanically Alloyed ◽  
Fine Grain ◽  
Process Effects

ABSTRACTThe Bi2Te3-Sb2Te3 compounds with the composition of useful thermoelectric cooling materials were prepared by mechanical alloying-pulse discharge sintering process. Effects of the process on the Seebeck coefficient, electrical resistivity and thermal conductivity were investigated. Temperature dependence of the Hall coefficient was also observed in the temperature range 80 - 325 K.The figure of merit, Z, was found to be about 4.0 × 10−1K−1 at room temperature in the 25%Bi2Te3-75%Sb2Te3 composition sintered at 618K using grain refined mechanically alloyed powders which had the size of under 32 μm. The value of Z was remarkably improved with a decrease of the thermal conductivity shown in the fine grain compacts fabricated by mechanical alloying-pulse discharge sintering process.

scholarly journals Synthesis of TiAl from Sponge Ti and Chip Al through a Mechanical Alloying-Pulse Discharge Sintering Process

2000 ◽  
Vol 41 (5) ◽  
pp. 551-554 ◽  
Author(s):  
Qian Wang ◽  
Zhengming Sun ◽  
Hitoshi Hashimoto ◽  
Shuji Tada ◽  
Yong-ho Park ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Pulse Discharge ◽  
Sintering Process

Investigation of Microstructure and Property of Fe3Al/Al2O3 Composites

2010 ◽  
Vol 150-151 ◽  
pp. 1409-1412 ◽  
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Sintering Process ◽  
Composite Powders ◽  
Al2o3 Composite ◽  
Al2o3 Phase ◽  
The Mean ◽  
Xrd Patterns ◽  
Al2o3 Matrix

The Fe3Al/Al2O3 composites were fabricated by pressureless sintering process. The Fe3Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment, then the Fe3Al powders and Al2O3 powders were mixed and the Fe3Al/Al2O3 composite powders were prepared, so the Fe3Al/Al2O3 composites were fabricated by sintering process at 1700oC for 2h. The phase composition and microstructure of Fe3Al intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition, microstructure and mechanical properties of the Fe3Al/Al2O3 composites sintered bulks were investigated. The XRD patterns results showed that there existed Fe3Al phase and Al2O3 phase in the sintered composites. The Fe3Al/Al2O3 composites sintered bulks exhibited the homogenous and compact microstructure, the Fe3Al particles were homogenously distributed in the Al2O3 matrix, the mean particles size of Fe3Al intermetallics was about 3-5μm. The Fe3Al/Al2O3 composites exhibited more homogenous and compact microstructure with the increase of Fe3Al content in the Al2O3 matrix. The density and relative density of the Fe3Al/Al2O3 composites increased gradually with the increase of Fe3Al content. The fracture strength and fracture toughness of the Fe3Al/Al2O3 composites increased gradually with the increase of Fe3Al content. The elastic modulus and hardness (HRA) of the Fe3Al/Al2O3 composites decreased gradually with the increase of Fe3Al content.

scholarly journals Mechanical Properties and Microstructure of W-6Ni-4Co Alloy by a Two-Step Sintering Process

Metals ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 680 ◽  
Author(s):  
Hongfeng Dong ◽  
Peiyou Li ◽  
Taotao Ai ◽  
Wenhu Li
Keyword(s):  
Mechanical Properties ◽  
Mechanical Alloying ◽  
Solid Phase ◽  
Particle Sizes ◽  
Sintering Process ◽  
Dwelling Time ◽  
Milled Powders

The mechanical properties and microstructure of W-6Ni-4Co alloy through solid phase sintering and two-step sintering process were investigated. The results demonstrated that the particle sizes of W-6Ni-4Co alloy milled powders increased firstly and decreased later during a mechanical alloying process. The shape of alloy milled powders affected that of grains in alloy by solid phase sintering. The shape of W-rich particles in the alloys changed from stripes to network, to polygonal and to subsphaeroidal finally during two-step sintering process. The mechanical properties could be attributed to the densification and microstructure of alloys, and increased during two-step sintering with short dwelling time.

scholarly journals Development of Rod Shape TiAl Intermetallics by Mechanical Alloying Followed by Pulse Discharge Sintering Method

1999 ◽  
Vol 40 (9) ◽  
pp. 957-960 ◽  
Author(s):  
Z. H. Shan ◽  
Z. M. Sun ◽  
Hitoshi Hashimoto ◽  
Y. H. Park ◽  
Toshihiko Abe
Keyword(s):  
Mechanical Alloying ◽  
Pulse Discharge ◽  
Tial Intermetallics ◽  
Sintering Method

Study on the Preparation Technique and Magnetostriction of Sinter Tb0.7Pr0.3Fe1.80 Alloy

2012 ◽  
Vol 189 ◽  
pp. 152-156
Author(s):  
H.Y. Yin ◽  
X. Liu ◽  
R. Wang ◽  
Jin Jun Liu ◽  
R.R. Lin ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Laves Phase ◽  
Type Structure ◽  
Preparation Technique ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Standard Strain ◽  
X Ray ◽  
Magnetoelastic Properties ◽  
Composite Samples

Mechanical alloying (MA) and subsequent solid sintering process was used to prepare the Pr-containing pseudobinary Tb0.7Pr0.3Fe1.80alloys. The structural and magnetoelastic properties were in comparative investigated by means of x-ray diffraction and a standard strain technique for sinter and composite samples. The high Pr-content (Tb,Pr)Fe2Laves phase with MgCu2-type structure for the composition Tb0.7Pr0.3Fe1.80 were synthesized by MA plus annealing at 500 °C.

Investigation of Microstructure and Property of the Fe3Al/Al2O3 Composites Fabricated by Mechanical Alloying Process and Plasma Active Sintering Process

2011 ◽  
Vol 194-196 ◽  
pp. 1689-1692
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Mechanical Property ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Sintering Process ◽  
Composite Powders ◽  
Al Content ◽  
The Mean ◽  
Xrd Patterns ◽  
Microstructure And Mechanical Property

The Fe3Al/Al2O3composites were fabricated by plasma active sintering process. The Fe3Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment, then the Fe3Al powders and Al2O3powders were mixed and the Fe3Al/Al2O3composite powders were prepared, so the Fe3Al/Al2O3composites were fabricated by plasma active sintering process at 1200°C for 5min under the pressure of 30MPa. The phase composition and microstructure of the Fe3Al intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition, microstructure and mechanical property of the Fe3Al/Al2O3composites sintered bulks were investigated. The XRD patterns results showed that there existed Fe3Al phase and Al2O3phase in the sintered composites. The Fe3Al/Al2O3composites sintered bulks exhibited the homogenous and compact microstructure, the Fe3Al particles were homogenously distributed in the Al2O3matrix. The mean particles size of Fe3Al intermetallics was about 2-3μm and mean particles sizes of Al2O3was about 2-3μm. The density and relative density of the Fe3Al/Al2O3composites increased gradually with the increase of Fe3Al content. The fracture strength and fracture toughness of the Fe3Al/Al2O3composites increased gradually with the increase of Fe3Al content. The elastic modulus and hardness(HRA) of Fe3Al/Al2O3composites decreased gradually with the increase of Fe3Al content.

Preparation of Fe2VAl Thermoelectric Module by RF Sputtering

2007 ◽  
Vol 539-543 ◽  
pp. 3285-3289 ◽  
Author(s):  
Akihiro Matsumoto ◽  
Masashi Mikami ◽  
Keizo Kobayashi ◽  
Kimihiro Ozaki ◽  
Toshiyuki Nishio
Keyword(s):  
Film Thickness ◽  
Mechanical Alloying ◽  
Aluminum Content ◽  
Pulse Current ◽  
Rf Sputtering ◽  
Thermoelectric Module ◽  
Electric Force ◽  
Sintering Process ◽  
The One ◽  
Deposited Film

An attempt to prepare Fe2VAl deposited film and the thermoelectric module using RF sputtering has been made. Sputtering target has been prepared using mechanical alloying of metallic powders and the subsequent pulse current sintering process. The obtained deposited film has had a lack of aluminum content compared to the composition of the starting material. Controlling of aluminum content for the preparation of Fe2VAl sputtering target has made it possible to obtain the desired material composition. The film has had the experimental thermoelectric force being similar to the one estimated from the measured thermoelectric data of the materials. Fe2VAl thermoelectric module of eight pairs with a film thickness of 4 μm has had an electric force of 31mV and 5.6μW.

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