Study on Viscosity of Zr-Cu Alloys Based on Viscosity Measurement and Hirai Model

2011 ◽  
Vol 704-705 ◽  
pp. 1100-1105 ◽  
Author(s):  
Jing Song Wang ◽  
Shu You Huang ◽  
Li Jun Cao ◽  
Hao Yan Sun ◽  
Jing Hua Wang ◽  
...  
Keyword(s):  
Liquidus Temperature ◽  
Arrhenius Equation ◽  
Rotating Cylinder ◽  
Viscosity Data ◽  
Vacuum Melting ◽  
Temperature Relation ◽  
Cu Alloys ◽  
Cylinder Method ◽  
Covering Slag ◽  
The Relationship

In this paper, the viscosity of molten Zr50Cu50 alloy was measured by using NaF-CaF2 covering slag protection combining rotating cylinder method firstly under non-vacuum melting condition. The curve of viscosity and temperature was acquired stably in the temperature range from 1370K to the liquidus temperature (1208K). According the Arrhenius equation form, the viscosity-temperature relation of molten Zr50Cu50 alloy can be fit as the following equation: （1208K50 alloy can be calculated by the above equation in the range of 1370 to 1208K. The viscosity values of molten Zr50Cu50 alloy calculated by Hirai model are relatively small, so the corrected Hirai model was obtained by the measured viscosity data. The viscosities of molten Zr-Cu alloys can be expressed by the following corrected Hirai model: The viscosities of typical molten Zr-Cu alloys were calculated by the above corrected model. The results showed that the viscosities of Zr-Cu alloys are larger at the respective liquidus temperature. The fundamental data were provided for researching the relationship between viscosities of molten Zr-Cu alloys and amorphous form ability.

Effects of basicity and CaF2 on the viscosity of CaF2–CaO–SiO2 slag for electroslag remelting process

2019 ◽  
Vol 116 (6) ◽  
pp. 638 ◽  
Author(s):  
Yigui Lao ◽  
Yunming Gao ◽  
Fangjie Deng ◽  
Qiang Wang ◽  
Guangqiang Li
Keyword(s):  
Rotating Cylinder ◽  
Electroslag Remelting ◽  
Experimental Conditions ◽  
Ft Ir ◽  
Cylinder Method ◽  
The Fourier Transform ◽  
The Relationship ◽  
Complex Anions ◽  
Silicate Complex ◽  
Ft Ir Spectroscopy

Effects of the basicity and the CaF2 content on viscosity of CaF2–CaO–SiO2 slag with high CaF2 content for electroslag remelting process were investigated by the rotating cylinder method in the temperature ranging from 1773 to 1533 K. The relationship between the structure and the viscosity variation of the slag was also clarified by the Fourier transform infrared (FT-IR) spectroscopy of water-quenched slags. The results show that the viscosity gradually decreases with the increase in the basicity of the slag from 1 to 3 under the present experimental conditions. It is found that the CaO does not depolymerize all silicate complex anions for the slag with the basicity of 1 at 1773 K and there are still some bridging oxygens. With the increase in the basicity to 3, the silicate complex anions are almost completely depolymerized to simple ions. As the CaF2 content increases from 40 to 80 mass%, the viscosity of the slag decreases due to the dilution of CaF2 for the concentration of the silicate complex anions in unit volume of the slag. Moreover, the effect of the temperature on the viscosity is not remarkable. The activation energy of viscous flow exhibits the decrease from 40.4 to 26.7 kJ · mol−1 with the increase in the basicity from 1 to 3, and also the decrease from 66.6 to 31.0 kJ · mol−1 with the increase in the CaF2 content from 40 to 80 mass%.

Influence of TiC0.3N0.7 on viscosity of TiO2-containing slag

2018 ◽  
Vol 115 (4) ◽  
pp. 412 ◽  
Author(s):  
Renze Xu ◽  
Jianliang Zhang ◽  
Kexin Jiao ◽  
Yanxiang Liu
Keyword(s):  
Arrhenius Equation ◽  
Volume Fraction ◽  
Relative Viscosity ◽  
Apparent Volume ◽  
Pure Liquid ◽  
Two Phase ◽  
Cylinder Method ◽  
Experimental Values ◽  
Solid Liquid ◽  
The Relationship

The influence of TiC0.3N0.7 on viscosities of CaO-SiO2-MgO-Al2O3-TiO2 slags was investigated by the rotating cylinder method in this work. From the viscosity experimental results, it was found that the viscosity of the two-phase suspension system increased with increasing the volume fraction of TiC0.3N0.7 particle and decreased with increasing the rotation speed. The viscosity increased with the temperature decreasing and the relationship between viscosity and temperature could be described by the Arrhenius equation. However, temperature has little influence on the relative viscosity which is the ratio of solid–liquid mixture viscosity to pure liquid viscosity. The modified Einstein–Roscoe equation based on the present experimental values could well estimate the viscosity of TiC0.3N0.7 containing melts. The apparent volume of TiC0.3N0.7 was calculated to be 5.0–6.0 times of its real volume.

Discussion on Relationship between Viscosities of Molten Zr-Cu Based Alloys and their Glass Forming Ability

2011 ◽  
Vol 194-196 ◽  
pp. 1242-1246
Author(s):  
Jing Song Wang ◽  
Li Jun Cao ◽  
Jing Hua Wang ◽  
Hao Yan Sun ◽  
Shu You Huang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Rotating Cylinder ◽  
Glass Forming Ability ◽  
Vacuum Condition ◽  
Glass Forming ◽  
Amorphous Sample ◽  
Cylinder Method ◽  
The Relationship

The dynamic viscosities of molten Zr55Ni5Al10Cu30 and Zr50Cu50 alloys were measured by using rotating cylinder method under non-vacuum condition. According to the lnη~1/T curves, discontinuous changes were found and the activation energy was calculated. The activation energy of molten Zr55Ni5Al10Cu30 alloy is obviously larger than that of molten Zr50Cu50 alloy. Amorphous sample of Zr55Ni5Al10Cu30 with 3mm diameter was prepared successfully under non-vacuum condition, but there are crystallization phases in Zr50Cu50 amorphous sample with 2mm diameter. The relationship between viscosities of molten Zr-Cu based alloys and their glass forming ability (GFA) was discussed, and viscosities of molten Zr-Cu based alloys play an important role on their GFA.

New Method for Measuring the Viscosity of the Molten Amorphous Alloy

2010 ◽  
Vol 146-147 ◽  
pp. 63-69
Author(s):  
Li Jun Cao ◽  
Jing Song Wang ◽  
Wei Sun ◽  
Jing Hua Wang ◽  
Hao Yan Sun
Keyword(s):  
Activation Energy ◽  
Amorphous Alloy ◽  
Rotating Cylinder ◽  
New Method ◽  
Molten Alloy ◽  
Exponential Relationship ◽  
Measurement Results ◽  
Cylinder Method ◽  
Covering Slag

A new method, covering slag technology combining rotating cylinder method, has been proposed in this paper for measuring the viscosity of the molten amorphous alloy, and the viscosity of molten Zr50Cu50 alloy was measured. Furthermore, the changes of viscous activation energy Ev were analyzed. The measurement results showed: the viscosity of molten Zr50Cu50 alloy increases with decreasing temperature in the range of 1373 to 1208K and there is an overall exponential relationship. Two discontinuous points on the curve of lnη ~1/T have been found. After analyzing the changes of viscous activation energy Ev , the microstructure of molten alloy could be changed. The viscosity of molten Zr50Cu50 alloy is three orders of magnitude higher than that of some other alloys which is closely related with the excellent GFA of Zr50Cu50 alloy.

Viscosity Evaluation of Multi-phases Flux by Rotating Cylinder Method

2009 ◽  
Vol 95 (12) ◽  
pp. 807-812 ◽  
Author(s):  
Sohei Sukenaga ◽  
Shinichiro Haruki ◽  
Yoshinori Yamaoka ◽  
Noritaka Saito ◽  
Kunihiko Nakashima
Keyword(s):  
Rotating Cylinder ◽  
Cylinder Method

scholarly journals THE TIME CURVE OF FACET DETERMINATION IN AN ULTRABAR STOCK OF DROSOPHILA MELANOGASTER

1934 ◽  
Vol 17 (4) ◽  
pp. 487-498 ◽  
Author(s):  
A. H. Hersh
Keyword(s):  
Drosophila Melanogaster ◽  
Time Course ◽  
Arrhenius Equation ◽  
Temperature Relation ◽  
Time Curve ◽  
Velocity Constant ◽  
Effective Period ◽  
Different Temperatures ◽  
Sigmoid Curve ◽  
Males And Females

By a dissection of the data obtained by Driver on the effective periods at different temperatures in males and females of an ultrabar stock of Drosophila melanogaster it has been found that a symmetrical sigmoid curve satisfactorily describes the time course of the facet-determining reaction. Consequently the differences between members of the bar series in regard to this reaction do not represent merely developmental arrests of the process at some greater or lesser distance from a common upper asymptote, but the termination of the process is approached asymptotically. The velocity constant/temperature relation shows a discontinuity in the neighborhood of 21° which may be causally related to the change in the position of the effective period from the second to the third instar. The velocity constant apparently does not conform to the well known Arrhenius equation in its relation to temperature.

Apparent Viscosity and Rheological Behavior of Aluminum-Alloy Slurry Containing Nano-Sized SiC Particles

2019 ◽  
Vol 285 ◽  
pp. 391-397
Author(s):  
Kang Lu ◽  
Shu Sen Wu ◽  
Shu Lin Lü ◽  
Chong Lin
Keyword(s):  
Aluminum Alloy ◽  
Rheological Behavior ◽  
Apparent Viscosity ◽  
Mass Fraction ◽  
Matrix Alloy ◽  
Rotating Cylinder ◽  
Viscous Force ◽  
Semi Solid ◽  
The Relationship ◽  
Cylinder Viscometer

The apparent viscosity and rheological behavior of nanoSiCP/Al-5Cu composites were studied by using a high temperature coaxial rotating cylinder viscometer. The results show that mass fraction of nanoSiCP is an important factor for apparent viscosity of the nanoSiCP/Al-5Cu composites, and there is a great enhancement of apparent viscosity of the slurry with the increase of nanoSiCp content. It can attribute to the viscous force between nanoSiCp and matrix alloy melt above the liquidus. The increased amplitude of apparent viscosity in semi-solid state is far less than those in liquid state with the increase of mass fraction of nanoSiCp. The apparent viscosities of the composites reinforced with 0.5%, 1%, 1.5% and 2% nanoSiCp at 700°C were 24.78%, 95.25%, 160.29% and 228.62% higher than that of Al-5Cu alloy, respectively. Besides, the rheological model of nanoSiCP/Al-5Cu composites was established based on the fitting curve, which can precisely describe the relationship between the apparent viscosity of nanocomposites slurry and nanoSiCp mass fraction.

scholarly journals Field Strength Vs. Temperature Relation and the Structure of Sunspots

1993 ◽  
Vol 141 ◽  
pp. 48-51
Author(s):  
S.K. Solanki ◽  
U. Walther ◽  
W. Livingston
Keyword(s):  
Field Strength ◽  
Radial Distance ◽  
Magnetic Vector ◽  
Temperature Relation ◽  
Magnetic Gradients ◽  
The Relationship

AbstractThe relationship between the magnetic vector and the temperature of a large symmetric sunspot is studied on the basis of 1.56 µm spectra. From this relation we estimate the shape of the τ = 1 surface. i.e. the Wilson depression, as a function of radial distance in the sunspot. We find that the Wilson depression is relatively small throughout the penumbra and changes by 200–500 km at the umbral boundary. We also estimate the magnitude of magnetic gradients and curvature forces.

Effect of Dense Layer Formation on Dissolution Rate of MgO-C Refractory in Molten Slag

2006 ◽  
Vol 45 ◽  
pp. 162-166 ◽  
Author(s):  
Hiroyuki Sunayama ◽  
Masayasu Kawahara
Keyword(s):  
Chemical Composition ◽  
Corrosion Rate ◽  
Corrosion Test ◽  
Molten Slag ◽  
Cylindrical Specimen ◽  
Rotating Cylinder ◽  
Dense Layer ◽  
Layer Formation ◽  
The Matrix ◽  
Cylinder Method

The corrosion test for magnesia-carbon refractory, MgO-C, with dense layer has been carried out by a rotating cylinder method at 1673 K. The specimen, which was a cylinder of 25 mm diameter and 25mm height, was rotated in molten slag at 50 rpm. The chemical composition of slag was CaO-SiO2-FeO-MgO-CaF2. The corrosion rate was determined by the variation of radius of the cylindrical specimen against corrosion time. The decrease of radius was obtained by a calculation of dissolved MgO into the slag. In addition, the diameter of the specimen was measured with a slide calipers after the corrosion test. The cylindrical specimen was heated to form a dense layer before the corrosion test. The corrosion rate of the MgO-C refractory with dense layer was slower than that of the MgO-C refractory without dense layer. The oxidized layer, where the dense layer formed, dissolved at much the same rate as the MgO brick. The dense layer probably obstructed contact between slag and carbon in the matrix, and then oxidation of C by slag did not take place. Formation of the dense layer was effective to inhibit corrosion of MgO-C refractory by molten slag.

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