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In situ 법에 의한 Cu-Nb3Sn 복합재료선재의 초전도특성과 이에 미치는 Ti의 영향 (1)
박현순,서수정,이은덕,안재민 ( H . S .Park,S . J . Suh,U . D . Lee,J . M . Ahn ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.1
The Cu-Nb₃Sn composites wire as a superconducting material was prepared by in situ method as follow : Cu-15wt.%Nb alloys which were melted in a high-frequency induction furnace and casted in bar were cold-worked up to the final diameter of 0.24㎜, electroplated with Sn, pre-treated in two steps and then diffused at 550∼650℃ for 24∼96hrs. The overall J_c and T_c of the specimens were measured by the four point-probe method at 10K in the magnetic field of 0 Tesla. The overall J_c of the composites wire which diffused at 550℃ after pre-treating in two steps were generally higher than those of the wire at either 600℃ or 650℃. For the specimens diffused at 550℃, the overall J_c were increased until 72hrs. of diffusion time and then decreased. However, in case of diffusion at 600℃ and 650℃, the overall J_c were gradually decreased from the beginning. The maximum overall J_c obtained in this experiment was 1.3×10⁴A/㎠, which was measured for the specimen diffused at 550 for 72hrs. When the specimens were diffused at 550℃, for 72hrs. after pre-treating, the measured critical temperature, T_c was 16.19K. Similar T_c value were obtained in other specimens regardless of diffusion time and temperature.
자기저항헤드용 Ni81Fe19 박막의 구조 및 전자기적 특성에 미치는 자장중 열처리의 영향
김용성(Y. S. Kim),이경섭(K. S. Lee),서수정(S. J. Suh),박현순(H. S. Park),김기출(K. C. Kim),송용진(Y. J. Song) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.4
The effects of annealing in magnetic field after deposition on electromagnetic properties of Ni_(81)Fe_(19) thin(400Å) films prepared by RF-magnetron sputtering were investigated in terms of microstructure and surface morphology. The coercivity of the films was decreased below 300 ℃ due to stress relief and recrystallization, while increased at 400 ℃ due to grain growth and increasing the surface roughness. And then, 4πMs was almost independent of annealing temperatures. Increasing the annealing temperature, the electrical resistivity of films was decreased from 37 μΩ㎝ to 24 μΩ㎝, the magnetoresistance was nearly a constant of about 0.6 μΩ㎝, and the MR ratio was increased from 1.5 % to 3.1 %. Therefore, It was shown that increasing the magnetoresistive ratio was mainly affected by decreasing the electrical resistivity. Considering the practical application of the films for magnetoresistive heads, optimal annealing conditions was obtained after one hour annealing at 300 ℃ in 400 Oe unidirectional magnetic field.
Hot Press 및 Die - Upset 법에 의해 제조된 Nd - Fe - B - Co 자석의 자기적 특성
이경섭(K. S. Lee),김용성(Y. S. Kim),서수정(S. J. Suh),박현순(H. S. Park),박찬(C. Park) 한국자기학회 1997 韓國磁氣學會誌 Vol.7 No.1
The effect of Co and annealing temperature on the magnetic properties, phase change and microstructure of melt-spun (Nd_(14.73)Fe_(78.67)B_(6.60))_(100-x)Co_x (X=0, 1, 2, 3) ribbons has been studied. The Co containing ribbons were found to have higher coercivity (iHc) than the ribbons without Co. Intrinsic coercivity of 20.3 kOe has been obtained by addition of 2 at%Co. This effect by Co addition is also represented in the case of hot pressed and die-upseted magnets. The maximum intrinsic coercivities of hot press and die-upset (Nd_(14.73)Fe_(78.67)B_(6.60))_(100-x)Co_x (X=0, 1, 2, 3) magnets are 16.9 kOe and 15.2 kOe when X=2.
TRIP형 복합조직강판의 기계적특성에 미치는 열처리 방법
이상훈,이영섭,김용성,박현순 ( S . H . Lee,Y. S . Lee,Y . S . Kim,H . S . Park ) 한국열처리공학회 1997 熱處理工學會誌 Vol.10 No.2
The formation processes of the retained sustenite(γ_R) in SHCP100 steel sheets were investigated in order to improve the transformation induced plasticity(TRIP) effect of γ_R. An excellent combination of elongation about 23% and high strength over 830 ㎫ was achieved by processing of intercritical annealing and isothermal holding. The mechanical properties of TRIP-aided dual phase steel was found to depend on the volume ratio of each phase and the volume fraction of γ_R. It was also noted that the proper mechanical stability of γ_R improved the mechanical properties. In this work, the best balance of strength-ductility was obtained by holding the steel at 420℃ for 500sec. after annealing at 730℃ for 300 sec.
In-situ법에 의한 Cu-Fe 복합조직의 자기적 특성에 미치는 가공 및 열처리의 영향
서수경,박현순 ( S . J . Shur,H . S . Park ) 한국열처리공학회 1989 熱處理工學會誌 Vol.2 No.2
The Cu-Fe permanent magnet were prepared in situ process, which has economic and mass productive merits in producing multifilamentary composites. The purpose of this research was to study the effect of reduction ratio and heat treatment on magnetic property. As the reduction ratio of Cu-Fe wire increased, the filament structure became finer and interfilament distances decreased and the morphology of filament cross section became ribbon shape. As Fe content increased significantly. The coercivity and squareness of Cu-55wt%Fe composite increased as a reduction ratio became higher, whereas they increased to maximum values at 0.09㎜ ø for Cu-30wt%Fe, and 0.066㎜ ø for Cu-45wt%Fe respectively, and decreased for further reduction. The magnetic properties of Cu-Fe composites can be more enhanced by intermediate heat treatment. The best magnetic properties were obtained from Cu-55 wt%Fe composite deformed to 0.054㎜ ø and annealed.
in situ법에 의한 Cu-Fe계 다섬유상복합재과제조에 관한 연구
서수정,박현순 ( S . J . Shur,H . S . Park ) 한국열처리공학회 1991 熱處理工學會誌 Vol.4 No.2
Among the many maunfactured processes of producing multifilamentary composites, in situ process is widely used owing to its simplicity and easyness of mass production. In this study, the mechanical and electromagnetic properties of Cu-Fe composite materials was investigated. The tensile strength of the Cu-Fe wires increased as the Fe content and reduction ratio were increased. The Cu-30wt%Fe composites had the best properties in terms of figure merits compared to the other Cu-Fe composites made in this study or the commercially manufactured 6/1 ACSR cables of Cu cable. The coercivity was decreased by increasing Fe content, but the squareness was increased greatly. As increasing reduction ratio, the coercivity and squareness increased up to the maximum points, and then decreased. For example, the maximum values were obtained at 0.09㎜ø for Cu-30wt%Fe composites and at 0.066㎜ø for Cu-45wt%Fe composites. The magnetic property of Cu-Fe wires produced by precipitation treatment was higher than that of Cu-Fe wires produced by thermomechanical treatment. By annealing Cu-Fe wires after drawing process, the coercivity, remanence and squareness were improved.
Al2O3 분산 Zn-Co-Cr 전기도금강판의 제조조건 및 내식성에 관한 연구
김상범,서수정,박현순 ( S . B . Kim,S . J . Suh,H . S . Park ) 한국열처리공학회 1993 熱處理工學會誌 Vol.6 No.2
An improvement in corrosion resistance of various types of Zn-coated steel sheets is thought to be possible with the addition of fine oxide powder to the coating. In this study the corrosion resistance of the Al₂O₃ dispersed Zn-Co-Cr electroplated steel sheet has been investigated and the results were as follows : The corrosion resistance of Al₂O₃dispersed Zn-Co-Cr electroplated steel sheets was improved by increasing the contents of Co and Cr ions, and also Al₂O₃powders in the bath because of the increased amount of Co, Cr and Al₂O₃in deposits. In the Al₂O₃dispersed Zn-Co-Cr electroplated steels sheet, the structure of deposits was changed from fine microstructure as observed in high Co containing deposits to coarse microstructure as in high Cr and Al₂O₃containing deposits. By cold rolling of the Al₂O₃dispersed Zn-Co-Cr electroplated steel sheets to about 2 percent, thr corrosion resistance was improved further.
Die - upset법에 의한 Pr - Fe - B자석의 자기적 성질에 관한 연구
이경섭(K. S. Lee),서수정(S. J. Suh),박현순(H. S. Park),이병규(B. G. Lee),정지연(J. Y. Jung) 한국자기학회 1993 韓國磁氣學會誌 Vol.3 No.3
Starting ingot of Pr_(15)Fe_(77)B_8 were prepared by vacuum induction melting under argon atmosphere. The ingot were induction melted in a quartz crucible and then ejected as a molten alloy throuth a 0.6 ㎜ orifice onto a rotating copper wheel. An anisotropic magnet was prepared from ribbon by hot deformation techniques. A fully dense precursor magnet first made by pressing ribbons at 680 ℃ under a pressure of 21.8 ㎏ / ㎟. A substantially oriented magnets were obtained by die-upset under various conditions. As the compression ratio increases, the Br value increases pronouncedly though iHc decreases. Also, XRD analyses show increased diffraction peak from (006). From these results, it can be known that the magnetic easy axis was formed along the compression axis. As the die-upset speed increases, iHc increases though Br decreases. The Br increases up to 750 ℃ of die-upset temperature and above this temperature decreases. The value of 4πMs of the Pr_(15)Fe_(77)B_8 alloy prepared is found to be 11.8 KG. When the alloy was compressed by 0.8 under the die-upset speed of 0.05 m/sec at 750 ℃r B, was 11.0 KG indicating that the alloy has excellent magnetic anistropy. However, this alloy has some limitation because of low iHc.
김용성(Y. S. Kim),노재철(J. C. Ro),박현순(H. S. Park),서수정(S. J. Suh),김기출(K. C. Kim),송용진(Y. J. Song) 한국자기학회 1998 韓國磁氣學會誌 Vol.8 No.4
We investigated that the fabrication and reproducing signal characteristics of tri-layered magnetoresistance (MR) element for the high density magnetic thin film heads and sensors. Magnetoresistance curve of tri-layered MR element predicted by computer modeling was saturated above external field of -15 Oe~+22 Oe, and it was shifted to linearized region as large as 4 Oe. In the case of fabricated real device, magnetoresistance curve was saturated above external field of ±15 Oe, and it was shifted to linearized region as large as 4 Oe. As shown in real device, MR response curve was in good agreement with the simulation results. As a result of experimental data of reproducing output signal in real device, it retained normal sinusoidal waveforms in 1~4 Oe external magnetic field. In this magnetic field region, the fabricated heads with tri-layered MR element can be operated with good reproduced characteristics. This will be beneficial to the use of efficient processes of manufacturing elements and the vacuum deposition techniques which control thin film properties.