scholarly journals THE REFINING OF TITANIUM BY CRUCIBLELESS ZONE MELTING METHOD

2021 ◽  
pp. 70-76
Author(s):  
O.E. Kozhevnikov ◽  
M.M. Pylypenko ◽  
A.P. Shcherban ◽  
О.А. Datsenko ◽  
V.M. Pelykh ◽  
...  
Keyword(s):  
Electron Beam ◽  
Base Metal ◽  
Total Content ◽  
Distribution Coefficients ◽  
Zone Melting ◽  
Melting Method ◽  
Interstitial Impurities ◽  
Impurity Elements ◽  
Effective Distribution

The physical substantiation of titanium refining by crucibleless electron beam zone melting (ZM) method in vacuum was presented. Calculations of the equilibrium, limiting and effective distribution coefficients for impurity elements in the base metal were carried out. The refining of titanium was studied experimentally, and samples with a purity of 99.92 wt.% were received. The total content of impurities was reduced by a factor of 1.5 (from 0.12 to 0.08 wt.%). The concentration of interstitial impurities was significantly reduced (oxygen – by 1.3; carbon – by 2; nitrogen – by 2.5 times). The structure and microhardness were investigated.

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

scholarly journals Preparation of Bulky Zr-Based Amorphous Alloys by a Zone Melting Method

1994 ◽  
Vol 35 (12) ◽  
pp. 923-926 ◽  
Author(s):  
Akihisa Inoue ◽  
Yoshihiko Yokoyama ◽  
Yoshiyuki Shinohara ◽  
Tsuyoshi Masumoto
Keyword(s):  
Amorphous Alloys ◽  
Zone Melting ◽  
Melting Method

Thermoelectric Properties of n-type (Bi2Se3)x(Bi2Te3)1-x Crystals Prepared by Zone Melting

2008 ◽  
Vol 368-372 ◽  
pp. 547-549
Author(s):  
Jun Jiang ◽  
Ya Li Li ◽  
Gao Jie Xu ◽  
Ping Cui ◽  
Li Dong Chen
Keyword(s):  
Thermal Conductivity ◽  
Electrical Conductivity ◽  
Seebeck Coefficient ◽  
Carrier Concentration ◽  
Thermoelectric Properties ◽  
Figure Of Merit ◽  
Zone Melting ◽  
Chemical Compositions ◽  
Melting Method ◽  
Temperature Range

In the present study, n-type (Bi2Se3)x(Bi2Te3)1-x crystals with various chemical compositions were fabricated by the zone melting method. Thermoelectric properties, including Seebeck coefficient (α), electrical conductivity (σ) and thermal conductivity (κ), were measured in the temperature range of 300-500 K. The influence of the variations of Bi2Te3 and Bi2Se3 content on thermoelectric properties was studied. The increase of Bi2Se3 content (x) caused an increase in carrier concentration and thus an increase of σ and a decrease of α. The maximum figure of merit (ZT = α2σT/κ) of 0.87 was obtained at about 325 K for the composition of 93%Bi2Te3-7%Bi2Se3 with doping TeI4.

scholarly journals Research Progress in Preparation and Purification of Rare Earth Metals

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1376
Author(s):  
Hang Liu ◽  
Yao Zhang ◽  
Yikun Luan ◽  
Huimin Yu ◽  
Dianzhong Li
Keyword(s):  
Rare Earth ◽  
High Purity ◽  
Rare Earth Metals ◽  
Melting Zone ◽  
Thermal Reduction ◽  
Zone Melting ◽  
Research Progress ◽  
Molten Salt Electrolysis ◽  
Interstitial Impurities ◽  
Metallic Impurities

The purity of rare earth metals is one of the most important factors to research and develop high technique materials. However, high purity rare earth metals are not easily achieved. This review summarizes the preparation and purification methods of rare earth metals. First, the preparation principle and process of molten salt electrolysis and metal thermal reduction are introduced. The main sources of metallic impurities and interstitial impurities in rare earth metals as well as the action mechanism of reducing the concentration of different impurities are analyzed and summarized. Then, the purification principle and process of vacuum distillation, arc melting, zone melting, and solid state electromigration are also discussed. Furthermore, the removal effect and function rule of metallic impurities and interstitial impurities in rare earth metals are outlined. Finally, the crucial issues in the development of high purity rare earth metals are put forward, and the development direction of high purity rare earth metals in future are pointed out on this basis.

Approach to reduce the residual strain in bulk InGaAs crystals grown by the multi-component zone melting method

2007 ◽  
Vol 4 (4) ◽  
pp. 1415-1418
Author(s):  
M. S. Rahman ◽  
M. R. Islam ◽  
M. S. Alam ◽  
M. Yamada
Keyword(s):  
Residual Strain ◽  
Zone Melting ◽  
Melting Method
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