scholarly journals Thermodynamic assessment of the Al-Mo-V ternary system

2017 ◽  
Vol 53 (2) ◽  
pp. 95-106 ◽  
Author(s):  
B. Hu ◽  
B. Yao ◽  
J. Wang ◽  
J.-R. Zhao ◽  
F.-F. Min ◽  
...  
Keyword(s):  
Ternary System ◽  
Binary Systems ◽  
Thermodynamic Assessment ◽  
Experimental Information ◽  
Reaction Scheme ◽  
Experimental Phase Equilibria ◽  
Solution Models ◽  
Almost All ◽  
Kister Equation ◽  
Optimal Set

Thermodynamic assessment of the Al-Mo-V ternary system was performed by means of the CALPHAD (CALculation of PHAse Diagram) approach based on the thermodynamic descriptions of three constitutive binary systems (Al-Mo, Al-V and Mo-V) as well as the experimental phase equilibria data available in the literature. The solution phases, i.e. liquid, bcc (Mo, V) and fcc (Al), were described using the substitutional solution models with the Redlich-Kister equation. The binary phases in the Al-Mo and Al-V systems with the solubilities of the third element were modeled using the sublattice models. An optimal set of thermodynamic parameters for the Al-Mo-V system was obtained. Six isothermal sections at 1200, 1000, 750, 715, 675 and 630?C and liquidus projection with isotherm were calculated. The reaction scheme for the entire Al-Mo-V system was also constructed. Comparisons between the calculated and measured phase diagrams indicated that almost all the reliable experimental information was satisfactorily accounted for by the present modeling.

Thermodynamic Calculation of Bi-Au-Lu, Nd Ternary Systems

2016 ◽  
Vol 850 ◽  
pp. 444-451
Author(s):  
Shu Liang Wang ◽  
Lu Jiang Zhou ◽  
Jia Lian Li ◽  
Xiao Hong Wang ◽  
Yuan Hua Lin ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Intermetallic Compounds ◽  
Binary Systems ◽  
Ternary Systems ◽  
Free Energies ◽  
Gibbs Energies ◽  
Solution Models ◽  
New Type ◽  
Free Solder ◽  
Kister Equation

With available melting point and hardness, the Bi-based filler alloy is considered as one choice of high-temperature Pb-free solder. Phase diagram can play an important role in the design of new type of Pb-free solder.In the present work, the thermodynamic assessments of the Au-Nd and the Au-Lu binary systems have been carried out by the Calculation of Phase Diagram (CALPHAD) method based on the available experimental data. The Gibbs free energies of the solution phases were described by subregular solution models with the Redlich-Kister equation, and those of the intermetallic compounds were described by sublattice models. A set of self-consistent and reasonable thermodynamic parameters is obtained for the binary systems, which describes the Gibbs energies of the solution phases and the intermetallic compounds phases. Additionally, combined the reported Bi-Au, Bi-Lu and Bi-Nd binary systems, the thermodynamic database of the Bi-Au-Lu and the Bi-Au-Nd ternary systems have been developed, which will provide important thermodynamic information for the phase equilibria of the multicomponent Bi-based alloy systems.

Thermodynamic Assessment of the Na-Cu and Na-K Binary Systems

2018 ◽  
Vol 284 ◽  
pp. 575-580
Author(s):  
E.A. Trofimov ◽  
O.V. Samoilova ◽  
E.R. Vakhitova
Keyword(s):  
Experimental Data ◽  
Software Package ◽  
Binary Systems ◽  
Thermodynamic Assessment ◽  
Nuclear Reactors ◽  
Nuclear Industry ◽  
Liquid Sodium ◽  
Factsage Software ◽  
Kister Equation ◽  
Sodium And Potassium

The Na–Cu and Na–K systems present a big interest for the study due to the use of liquid sodium and melt of sodium and potassium in the nuclear industry as a coolant in nuclear reactors. In the present work, thermodynamic modeling of phase equilibria in the Na–Cu and Na–K systems is carried out, based on the available published experimental data. This modeling was done using the “FactSage” software package (version 7.0). The set of Redlich–Kister equation parameters was obtained, that allows to describe the dependence of Gibbs energy from composition and temperature for solutions that can be formed in the studied systems. Phase diagrams (T–x diagrams) of the investigated systems were calculated.

Thermodynamic assessment of B–Zr and Si–Zr binary systems

2009 ◽  
Vol 468 (1-2) ◽  
pp. 209-216 ◽  
Author(s):  
H.M. Chen ◽  
F. Zheng ◽  
H.S. Liu ◽  
L.B. Liu ◽  
Z.P. Jin
Keyword(s):  
Binary Systems ◽  
Thermodynamic Assessment

Cure Modification Effected by 2-Iminothiophthalimides in the Vulcanization of NR Accelerated by Thiocarbamyl Sulfenamides and Dibenzothiazyl Disulfide

1987 ◽  
Vol 60 (5) ◽  
pp. 803-821 ◽  
Author(s):  
Prasanta Kumar Das ◽  
Rabindra Nath Datta ◽  
Dipak Kumar Basu
Keyword(s):  
Tensile Strength ◽  
Binary Systems ◽  
Cure Rate ◽  
Physical Data ◽  
Enhanced Activity ◽  
Torque Values ◽  
Almost All

Abstract Studies have been made on the effect of N-oxydiethylene thiophthalimide (ODTP) and N-cyclopentamethylene thiophthalimide (CPTP) as retarders in the vulcanization of NR. N-oxydiethylenethiocarbmyl-N′-cyclopentamethylene sulfenamide (OTCS) and N-oxydiethylene thiocarbamyl-N′-oxydiethylene sulfenamide (OTOS) have been used separately with MBTS to form the binary systems of accelerators. Retardation exhibited by the combinations OTCS-MBTS-ODTP and OTOS-MBTS-CPTP is noteworthy. In these systems, both CBDS and OBDS are formed. The enhanced activity with regard to torque, scorch, modulus, tensile strength, etc. is believed to be due to the presence of CBDS and OBDS. Probable reactions for the formation of various compounds responsible for acceleration and retardation of vulcanization of NR have been explored. It has been observed that ODTP and CPTP provide better cure-retardation than CTP and in almost all the cases, the cure rate and torque values of the resulting vulcanizates are increased. In the case of filled vulcanizates containing HAF, it seems that the nature of the reaction is of the same kind as observed in the case of gum stocks but differs only in degree. The physical data of the vulcanizates containing HAF also indicate that both ODTP and CPTP excel CTP in many respects.

scholarly journals Two-phase equilibrium in binary and ternary systems II. The system methane-ethylene III. The system methane-ethane-ethylene

1940 ◽  
Vol 176 (964) ◽  
pp. 140-152 ◽  
Keyword(s):  
Phase Equilibrium ◽  
Ternary System ◽  
Binary Systems ◽  
Ternary Systems ◽  
Two Phase ◽  
Composition Diagram ◽  
Wide Range ◽  
Binary And Ternary Systems

The liquid-vapour equilibrium of the system methane-ethylene has been determined at 0, -42 , -78, -88 and -104° C over a wide range of pressures and the results are shown on a pressure-composition-temperature diagram and by a series of pressure-composition curves. The liquid-vapour equilibrium of the ternary system methane-ethane-ethylene has been determined at -104, -78 and 0° C. Values for the two binary systems methane-ethane and methane-ethylene and for the ternary system methane-ethane-ethylene are shown on a composite pressure-composition diagram.

scholarly journals Rates of reactions catalysed by a dimeric enzyme. Effects of the reaction scheme and the kinetic parameters on co-operativity

1991 ◽  
Vol 280 (1) ◽  
pp. 131-137 ◽  
Author(s):  
H Ishikawa ◽  
H Ogino ◽  
H Oshida
Keyword(s):  
Substrate Inhibition ◽  
Reaction Scheme ◽  
Rate Equations ◽  
Kinetic Behaviour ◽  
Hill Coefficients ◽  
S Curve ◽  
Almost All ◽  
The Hill ◽  
Rate Behaviour ◽  
Reaction Schemes

For the reaction S in equilibrium P catalysed by a dimeric enzyme, the reaction schemes are considered on the basis of the KNF model. For each of the ten possible schemes, the rate equation is derived on the basis of the combined steady-state and rapid-equilibrium assumptions. The curves of the plots of initial velocity v versus the substrate concentration [S] and the Hill coefficients h calculated from the rate equations depend strongly on the reaction scheme and the parameter X1. This parameter is defined by log (KS2/KS1) and is a measure of the relative affinities of the first and second protomers for the substrate. When X1 less than 0, v-[S] curves for some schemes exhibit negative co-operativity (h less than 1.0) and v-[S] curves for other schemes are similar to that of the Michaelis-Menten scheme, indicating that, even if there is interaction between the distinct protomers, sigmoidal rate behaviour is not necessarily observed. When X1 greater than 0, all the reaction schemes except one, which shows substrate-inhibition kinetic behaviour, exhibit sigmoidal kinetic behaviour (h greater than 1.0), and at the limit of X1 much greater than 0 the Hill coefficients attain the maximum possible value of 2.0. Furthermore, we have found that, even if X1 = 0, the v-[S] curve for almost all the schemes considered in the present work does not necessarily agree with that for the Michaelis-Menten scheme. This means that the deviation of the v-[S] curve from a hyperbola can be observed even if there is no interaction between the distinct protomers.

scholarly journals The Addition of N-Butanol in Ethanol-Isooctane Mixture to Reduce Vapor Pressure of Oxygenated-Gasoline Blend

2017 ◽  
Vol 17 (3) ◽  
pp. 500 ◽  
Author(s):  
Rendra Panca Anugraha ◽  
Zul Akbar Andi Picunang ◽  
Annas Wiguno ◽  
Rizky Tetrisyanda ◽  
Kuswandi Kuswandi ◽  
...  
Keyword(s):  
Experimental Data ◽  
Ternary System ◽  
Vapor Pressure ◽  
Binary Systems ◽  
Experimental Results ◽  
Ideal Solution ◽  
Positive Deviation ◽  
Relative Deviation ◽  
Wilson Model ◽  
Binary Parameter

In this work, vapor pressure of binary systems for isooctane + ethanol, isooctane + n-butanol and ethanol + n-butanol and ternary system for isooctane + ethanol + n-butanol were measured in the temperature range from 313.15 to 318.15 K using the inclined ebulliometer. The experimental results showed that the existence of n-butanol in isooctane decreases the vapor pressure of mixture, while increasing n-butanol fraction in ternary isooctane-ethanol-n-butanol mixture decreased vapor pressure of mixture. Experimental data for binary systems studied were correlated with Wilson, NRTL and UNIQUAC models with average relative deviation (ARD) of 3.5%. The optimized binary parameter pairs obtained in this work were used to estimate the ternary system. The Wilson model gave the best performance for estimation of ternary system with ARD of 5.4%. All systems studied showed non-ideal solution with positive deviation from Raoult’s law.

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