Papers by Keyword: Liquid Alloys

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Authors: Iwao Katayama, Toshihiro Tanaka, Shin-ichi Akai, Kisao Yamazaki, Takamichi Iida
Abstract: Activity of tin in liquid Sn-Ag-Bi alloys was derived by EMF measurement of galvanic cell with fused salts electrolyte in the temperature range of 700 to 900K in the whole composition range. Activity of tin at 900K shows very small positive deviation from Raoult’s low for Sn-Bi alloys. Activity of ternary alloys was measured along three pseudo binary systems of Sn-(Ag,Bi) (where xAg/xBi =1/3,1/1 and 3/1). Its concentration dependence is very complex. From the iso-activity curves in the ternary system excess free energy of mixing is derived using Darken’s method for Gibbs-Duhem equation
Authors: A.A. Turchanin, M.A. Turchanin, I.A. Tomilin
Authors: Iwao Katayama, Yusuke Sendai, Dragana Zivkovic, Dragan Manasijević, Zivan Zivkovic, Hiromi Yamashita
Abstract: EMF of galvanic cell with zirconia –based solid electrolytes was measured to determine the activity of Ga in liquid Ga-Sb-Tl alloys between 946 and 1233 K along the tree pseudobinary lines of Ga-(Sb/Tl), (xSb/xTl = 1/3, 1/1 and 3/1) The cell used was: Ga,Ga2O3|(ZrO2)0.92(Y2O3) 0.08|Ga-Sb-Tl, Ga2O3. The activity of Ga (aGa ) was derived by :-3EF = RT ln aGa , where E is cell potential, F is Faraday’s constant, R is gas constant and T is cell temperature. The activity of Ga shows slight negative deviations from ideality in the section with positive deviation from ideality in the whole composition range. The activity of gallium shows slight negative deviations from Raoult’s law in the section with xSb/xTl = 3/1, moderately positive deviations in xSb/xTl =1/1 section and large positive deviations in xSb/xTl =1/3 section.
Authors: Hui Ying Tang, De Quan Shi, Yong Jun Zhao, Da Yong Li, Xu Dong Shi, Zhi Wei Gao
Abstract: In this paper, several methods for testing the filling capacity including mechanical test method, vacuum test method, electrometric method, high-speed photography method and X-ray observation method were reviewed, and they can be divided into two classes, namely traditional test method and new test method based on computer. The principles and measurement process of theses methods were summarily described. Through further analysis and comparison, their merits and limitations were indicated respectively. Also, their applications in measuring filling capacity of liquid alloys were exemplified. Finally, it is thought that the development and application of computer technology will benefit to the accuracy improvement of filling capacity.
Authors: Xiu Fang Bian, Wei Min Wang, Jing Yu Qin
Authors: R. Novakovic, Maria Luigia Muolo, E. Ricci, E. Ferrera, D. Giuranno, F. Gnecco, Alberto Passerone
Abstract: The wetting phenomena and adhesion between Ag-Cu-Zr molten alloys (where Zr is an active brazing element) and ZrB2-ceramic substrate have been investigated from theoretical and experimental point of view. The wetting phenomena of molten alloy/ceramic substrate depend on the bonding characteristics of liquid alloys and ceramics as well as the magnitude of interactive forces at the interface. Accordingly, the first step of this investigation is to determine the surface properties of Ag-Cu, Ag-Zr and Cu-Zr liquid alloys. The energetics of the bulk and the surface of liquid alloys have been analysed in the framework of statistical mechanical theory in conjunction with Quasi-Lattice Theory (QLT), through the study of the concentration dependence of various properties such as surface tension, surface composition, concentration fluctuations in the long wavelength limit and Warren-Cowley chemical short-range order parameter. Combining the Young and the Dupré equations, the obtained values of surface tension together with contact angle data have been used to calculate the work of adhesion.
Authors: Dragana Živković, Iwao Katayama, Živan Živković, Dragan Manasijević
Abstract: The results of thermodynamic investigation of some liquid alloys in Ga-Sb-Bi-Sn system, obtained by calculation according to different thermodynamic predicting methods, are presented in this paper. The research was done based on the known experimentally obtained thermodynamic properties of related binary and ternary subsystems. Calculated data on a Ga-Sb-Bi-Sn system include thermodynamic properties for liquid alloys at temperature of 900K in chosen sections of investigated quarternary system with molar ratios of Sn:Sb:Bi = 6:3:1; 8:1:1 and 6:1:3.
Authors: A.A. Turchanin, M.A. Turchanin, P.G. Agraval
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