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김성광,Wanlin Wang,강윤배 대한금속·재료학회 2015 METALS AND MATERIALS International Vol.21 No.4
Surface tension of multicomponent liquid steel was calculated based on the concept proposed by Butler, which assumes a chemical equilibrium between a bulk phase and a surface phase of a monolayer. Requirement for the calculation of the surface tension was categorized as: 1) accurate description of partial excess Gibbs energies of solutes in the liquid steel, in particular for those of non-metallic solutes such as S, C, etc., 2) physical properties of pure components, such as surface tension and molar volume, and 3) possibility of solving a series of Butler equations for multicomponent liquid steel. In the present study, it is proposed to use the Modified Quasichemical Model in order to describe the partial excess Gibbs energies of solutes, and to use the Constrained Gibbs Energy Minimization in order to solve equilibrium between the bulk and the surface phases of the multicomponent liquid steel. Physical properties of non-stable pure components such as S, C, were treated as variables to reproduce known experimental data in binary systems. The proposed method can be easily extended into multicomponent liquid steel. Examples of the surface tension calculations are presented.
마이크로웨이브 가열을 이용한 슬래그로부터 인의 용철로의 환원이동에 관한 열역학적 고찰
이준호,김은주,김태영,강윤배,Lee, Joon-Ho,Kim, Eun-Ju,Kim, Tae-Young,Kang, Youn-Bae 한국재료학회 2010 한국재료학회지 Vol.20 No.1
Phosphorus exhibits considerable segregation in steelmaking slag. In order to recover phosphorus from slag to $K_3PO_4$ via molten iron, a carbothermic reaction using microwave heating was suggested recently. The carbothermic reduction of phosphorus from slag to molten iron using microwave heating was carried out at 2073K. However, at this temperature the thermodynamic properties of both slag and molten iron cannot be determined experimentally. Therefore, the computational approach of the so-called CALPHAD method is very useful to understand the transfer of phosphorus from slag to metal and to enhance this reaction. In the present investigation, a theoretical study of the reduction behavior of phosphorus in slag was carried out at much lower temperatures using the recently developed thermodynamic database in the FactSage program. The calculated results showed reasonable accordance with the experimental data; namely, the thermodynamic database could be applied successfully to higher temperature reactions. The current study found that higher temperature and high $SiO_2$ concentration are favorable for the recovery of phosphorus from slag.
백민규 ( Min Kyu Paek ),장정목 ( Jung Mock Jang ),강윤배 ( Youn Bae Kang ),박종진 ( Jong Jin Pak ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.2
Equilibria between Mn-Si melts and MnO-SiO2 slags were studied at 1673 K and 1773 K in MnO crucibles to accurately determine the thermodynamic property of the Mn-Si melts. The Unified Interaction Parameter Formalism (UIPF) was used to describe the thermodynamic property of the Mn-Si liquid. Using the UIPF, the experimental results obtained in the present study were thermodynamically analyzed to determine the activity coefficient of Si at infinite dilution and the 1st- and 2nd-order self-interaction parameters of Si in the Mn-Si melts.
오우석(Woo Seok Oh),김규식(Gyu Sik Kim),강윤배(Youn Bae Kang) 전력전자학회 1999 전력전자학술대회 논문집 Vol.1999 No.7
In this paper, we attempt to control the pressure between two specimens using a servo gun m the resistance spot welding process. Servo guns have some advantages over pneumatic guns in that the fast response, the precise position control, and the accurate torque control are assured by virtue of the servo motor control, To demonstrate. the practical significance of our results, we present some experimental results.