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회귀분석법에 의한 2 성분계 열역학 및 상태도 자료의 최적화
최순돈 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.5
A straight-forward method for simultaneously optimizing thermodynamic functions and phase diagrams from experimental data of both is described. The method introduces the flags in a subprogram which allow us to calculate several thermodynamic functions. The functions may be derived from phase diagram analysis. In order to test the validity and the applicability of the present method, the Ag-Cu system is chosen because of its variety of phase boundaries including a miscibility gap. The experimental data are found to be excellently reproduced by the optimized expressions.
최순돈 嶺南大學校 工業技術硏究所 1990 연구보고 Vol.18 No.2
Thermodynamic analysis of r-loop in Cr-Fe alloy system was carried out by using the Flag Code Method. The input data used are Dench's enthalpy data and Kubaschewski's phase diagram data. The thermodynamic expressions are Legendre Polynomials. The measured data are excellently represented by the optimized equation.
FABRICATIO0N OF NASICON ELECTROLYTES
최순돈,박정우,Choi, Soon-Don,Park, Jung-Woo The Korean Sensors Society 1995 센서학회지 Vol.4 No.1
Conventional ball-milling technique was used to synthesize NASICON powders. The NASICON powders were made from three kinds of component powders : coarse($ZrO_{2}$, $Na_{3}PO_{4}$, $SiO_{2}$), fine ($ZrO_{2}$, $Na_{3}PO_{4}$, $SiO_{2}$) and fine ($ZrSiO_{4}$, $Na_{3}PO_{4}$) powders. The fine component powders were easily reacted to form the desired product at $1100^{\circ}C$ or higher, whereas incomplete reaction due to the coarse component powders occurred even at $1170^{\circ}C$. The finer the grain size of the starting powders was, the higher the bulk density of NASICON electrolyte after sintering was observed. Almost single phase NASICON electrolytes with more than 95% of the theoretical density, $3.27g/cm^{3}$, could be fabricated by sintering for $40{\sim}60$ hours at temperatures between 1150 and $1170^{\circ}C$.
NASICON 고체 전해질을 사용한 SOx 가스 감지센서
최순돈,이광범 ( Soon Don Choi,Kwang Beum Lee ) 한국센서학회 1996 센서학회지 Vol.5 No.4
A SOx sensor using NASICON electrolyte was developed for monitoring of air pollution. The following galvanic cell with Na₂SiO₃(Pt) reference electrode was assembled (수식) Na₂SiO₃ was used as an indicator electrode to protect NASICON electrolytes from chemical reaction with SO₂. The EMFs were measured after injecting SO₂ in the initial concentrations range of 5∼5 ppm at 400∼550℃. The measured and calculated potentials were in good agreement above 500℃. However, the cells were unstable below 500℃, most likely due to incomplete attainment of chemical equilibrium. Response time was within 10 min. Based on the stability and response time of this cell, the NASICON solid electrolyte with Na₂SiO₃(Pt) as the reference electrode and Na₂SO₃ (Pt)as the indicator electrode showed the possibility of a reliable, inexpensive commercial solid-state SO_x sensor.
최순돈,민봉기,최경수,박광묵,신현준 嶺南大學校 工業技術硏究所 2002 工業技術硏究所論文集 Vol.30 No.1
The plasma spray technics has known as one of the surface modification methods to improve the mechanical properties or the functional characteristics of materials. This paper has been aimed to investigate the effects of plasma sprayed conditions, such as spray distance, primary gas pressure and APL of plasma spraying ceramic(AL_2 O_3 : TiO_2= 87 : 13 w/o) coated blade. The optmum processing for ceramic coated blade are showed at primary gas pressure 80psi, spray distance 55mm, spray rate 40, APL 80kW. (APL; Arc power Level)
The Correlation of the Thermodynamic Properties and Phase Diagram of the System Cd-Pb
최순돈 대한금속재료학회(대한금속학회) 1985 대한금속·재료학회지 Vol.23 No.10
A method of correlating with precision the thermodynamic properties and phase boundaries of the cadmium-lead system is described. For the liquid phase, the Krupkowski equation is used to correlate the enthalpy data of Kleppa, the excess free energy data of Zabdyr, and the eutectic point data of Hansen and Anderko. For the fcc (Pb) phase, a quasi-regular model is used. The calculated phase diagram of the cadmium-lead system using these formalisms agrees well with the experimental diagram.
최순돈,이상기,김규호 한국전기전자재료학회 1990 電氣電子材料學會誌 Vol.3 No.4
여러가스에 대한 저항변화를 측정하기 위해 초미립 분말을 사용하여 pellet형 SnO$_{2}$ 가스센서를 제조하였다. 초미립 분말은 화학기상반응법으로 만들어졌으며 평균입경은 0.08.mu.m이었다. 냉간 성형된 소자는 사용전 공기중에서 700~850.deg.C에서 10~60분간 소성되었다. 측정된 결과는 분말의 소결성 및 열린 기공도로 설명될 수 있었다.
이성분계 실험식으로부터 Zn-Cd-Sn 합금계의 열역학 자료의 계산
최순돈 영남대학교 공업기술연구소 1989 연구보고 Vol.17 No.1
The thermodynamic properties of the liquid Zn-Cd-Sn solutions have been predicted from the binary component data by using a series of analytical expressions. The analytical expressions are developed by applying such binary empirical equations as the subreqular subreqular model and the Krupkowski equation. The geometrical methods employed for the derivation are Muggianu-, Kohler-, Colinet-, and Toop-methods. The experimental data of the Zn-Cd-Sn system measured by Ptak and Moser are found to be excellently represented by the derived expressions.