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RISS 인기검색어
- 검색키워드
- 저자 : 韓咸潤 (검색결과 11 건)
- 무료
- 기관 내 무료
- 유료
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韓咸潤 서울産業大學校 1985 논문집 Vol.21 No.1
In order to clearify the physical properties of amorphous ?? alloy, the electrical properties, the magnetic properties and the thermal stability has been investigated systematically with various apparatus. The results are as follows ; 1) The electrical resistivity of amorphous ?? alloy is about ?? and it is about twice of crystallized one. 2) The saturation magnetization of amorphous ?? alloy is about 113 emu/gr. 3) The crystallization in amorphous ?? alloy proceeds in 2-stage, and the transformation temperature of amorphous ?? alloy is 730k and 808k respectively. 4) The crystallization activation energy of amorphous ?? alloy is about 272 KJ/mole and 360 KJ/mole respectively.
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非晶質 Fe Si P 合金의 電氣 및 磁氣的 特性에 關한 硏究
韓咸潤 서울産業大學校 1987 논문집 Vol.26 No.1
This study aims to develop materials for iron cores of a transformer. Investigation has been conducted of electric and magnetic properties of amorphous materials in an attempt to obtain various basic data needed for making the iron cores by adding phosphorous, the amorphous materials, to Fe-Si alloy and thus producing amorphous ?? through the method of centrifugal rapid cooling. And the following results have been obtained: 1. In this experimental materials, the possible range of making amorphous is ?? at %, the density decreases according as x increases, and the value ranges from 7.19 to 7.25 gr/cc. 2. Saturation magnetization of amorphous ?? and magnetic moment per Fe atom increases according as x increases, and the values range respectively from 158.5 to 171 emu/gr and from 2.04 to 2.1μB. 3. Curie temperature and crystallization temperature range respectively from 570 to 610 k and from 680 to 700 k. 4. At the room temperature, the electrical resistivity of this materials increases according as x increases, and the value ranges from 133 to 140 μΩcm.
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韓咸潤 서울産業大學校 1989 논문집 Vol.29 No.1
For experimental study of magnetization mechanism of amorphous Fe-Si-P-(B) alloys perpared by single roller quenching method, temperature dependence of saturation magnetization was investigated by using V.S.M. From the result, composition dependence of Curie temperature and magnetic moment per Fe atom were discussed. It is 0.25, 0.49 and 1.22, respectively that donor electron is transfered from metalloid Si, B and P to 3d hole of Fe atom. It agrees with molecular field theory that Curie temperature and magnetic moment increase with increasing B and Si content at the same Fe content. But it is unique phenomenon that Curie temperature decreases with increasing Fe content at the same Si content for amorphous Fe-Si-P ternary alloys.
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韓咸潤 서울産業大學校 1984 논문집 Vol.20 No.1
Thermal stability of the amorphous Fe? Ni? B? alloys has been studied systematicallly through the differential thermal analysis, the X-ray diffraction and the change of the electrical resistance to temperature and time variations. ⑴ Crystallization temperature is about 690 K at 2 K/min heating rate ⑵ Crystallization phases are(f.c.c. a=3.578Å),Ni(f.c.c. a=3.518Å),Ni₃B (orthorhombic a=4.391Å,b=5.217Å, c=6.620Å) ⑶ Crystallization process follows Johnson-Mehl-Avrami equation and the crystallization activation energy is about 64.6 ㎉/㏖
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304형 스텐레스鋼으로부터 非磁性 스텐레스鋼의 製造에 關한 硏究
김대수,한함윤 서울産業大學校 1993 논문집 Vol.38 No.1
Optimum conditions for the manufacturing of nonmagnetic stainless steel from 304 type stainless scrap and preventing Martensitic transformation during the subsequent cold working process were investigated. The composition of the value of Ni-and Crequivalent be 17.1% and 17.5%, respectively. The amount of δ-ferrite in the specimen of non-magnetic stainless steel thus obtained was measured to be no more than 0.005%, and subsequently, magnetic permeability was determined to be less than 1.003, which is sufficient for the application on the electron-gun material.
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非晶質 Co Si B 合金의 比抵抗 및 Hall 效果에 關한 硏究
韓咸潤 서울産業大學校 1982 논문집 Vol.17 No.1
The electrical resistivity and Hall effect of amorphous ?? prepared by a rapid quenching method have been investigated in the temperature range of 300°K∼1100°K and the applied magnetic fields up to 17 kOe. It turned out as follows; 1) The electrical resistivity at room temperature is ?? and the temperature coefficient of resistivity is ??. 2) The crystallization temeprature is 705°K. 3) The ordinary Hall coefficient, the spontaneous Hall coefficient and the spontaneous Hall conductivity are ??, ?? and ??, respectively.
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김대수,한함윤 서울産業大學校 1993 논문집 Vol.37 No.1
The magnetic properties of Fe-based ultra-fine particles(UFP) were investigated varying the parameters such as gas pressure, arc current, and composition of the alloy. The optimum experimental conditions for the best quality UFP were determined to be 150-200 Torr of Ar and the arc currents of 20-30 Amp. The highest coercivety was obtained to be about 920 Oe with the alloy composition of Fe60Co40. From the particle-size measurement from both X-ray diffraction and Transmission Electrn Microscopy it has been seen that Fe-based UFT aggregates consisted of mainly particles with single magnetic domains. And the coercivity in the UFP is thought to be derived from the shape anisotropy like chain-like structure of the UFP aggregate.
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한함윤,류경근,김성태,金大洙 서울産業大學校 1995 논문집 Vol.41 No.1
Differential equations, describing the temperature profile within the toroidal-shaped ferromagnetic material when it was exposed to the external magnetic field which is sinusoidally varying w. r. t. time through the coil surrounding the material, were derived based on the incorporation of Maxwell equations with the equation of heat conduction in solid in cylindrical coordinates. From the numerical calculation of the equations derived the rate of heat generation inside the material and the temperature distribution within the material could be determined. It is found that the temperature profile has a maximum at critical tical frequencies which is dependent on the permeabilities.
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熱 및 破碎 履歷이 NdFeB 永久磁石의 磁氣的 特性에 미치는 影響
한함윤,김대수 서울産業大學校 1993 논문집 Vol.37 No.1
The micro-structure and magnetic properties of magnetic materials of Nd-Fe-B system has been investigated under the various conditions of heat treatment. It is found that the homogenized ingot exhibit larger grains and equilibrium magnetic phase, higher coercivity compared to the rapidly-quenched one. It also shows the fine micro-structure as well as the soft magnetic phase, which is undesirable to the permanent magnet, such as Fe and NdFe₄B₄, etc. From the series of X-ray diffraction works it is known that the sintered magnet processed from the rapidly-quenched alloy shows the higher degree of crystal orientation toward the c-axis. Sulfur addition on NdFeB alloy has the effect of increasing the residual magnetic flux density due to the enhanced alignment during the process of magnetic-field-pressing.
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