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장충근,김기원,권혁무 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.2
Studies on the X-ray stress measurement have been made in various kinds of nitrided iron specimens. The relation between the hardness measured mechanically and the stress measured by X-rays is Considered. The main results observed are: (1) Nitrided pure iron has the tendency of increaing residual stress with, the increasing time duration of nitriding, (2) Carbon steel has the tendency of decreasing residual stress with the increasing time duration of nitriding treatment. (3) Both of the above cases showed the same results that the hardness increases with the time duration of nitriding treatment.
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철-탄소 합금에서 r'- phase의 성장에 미치는 탄소의 영향
장충근,오헌진,오희필 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.2
To obtain the diffusion coefficient of nitrogen in Fe-C alloys, the 0-3% C-Fe alloy was nitrided by the liquid drop nitriding method in the temperature range of 650 C- 850 C. The main results observed are: (1) The frequency factor Do of nitrogen in 0-3%C-Fe alloy; Do(mC) = 1.17 exp[-1.08(mC)]㎠/sec (2) The activation energy Q of nitrogen in the alloy; Q(mC)= 27.2 exp [30.7(mC)]Kcal/mole (3) And finally, the diffusion coefficient of nitrogen in 0-3%C-Fe alloy is D_(N)= Do(mC) exp[-Q(mC)/RT] ㎠/sec
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장충근,권혁무 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.2
The effect of carbon and silicon on the hardness of nitrided iron at the temperature range of 650℃- 850℃ was investigated, In the case of carbon added iron, the peak hardnesses and surface hardness were increased but the thickness of nitrided layer was decresed than the nitrided pure iron, In the case of silicon added iron, the internal hardness and surface hardness were decreased than the carbon added iron.
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철-질소 2원계에서 r´-phase의성장에 관한 연구(Ⅱ)
장충근,김수영 충남대학교 자연과학연구소 1983 忠南科學硏究誌 Vol.10 No.2
In order to observe the effect of adding silicon and carbon in to the prepared Fe-Si and Fe-C alloyed specimens which were nitrided by using a nitrogen gas agent in the temperature range of 650-850℃. The effect of silicon and carbon on the frequency factor, activation energy and surface hardness of the specimens were also investigated. The relationships between the activation energy and the amount of silicon and carbon were obtained as Q(msi)=27.2 exp 23.92(msi) Kcal/mole Q(mc)=27.2 exp 30.70(mc) Kcal/mole The surface hardness of the specimens increased sharply by nitriding, but it decreased slightly when nitrided for a considerably long time, while the internal hardness increased.
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CdTe 감마선 검출소자의 Schottky Contact에 관한 연구
장충근,윤만영,유중열,김영전,황선태 충남대학교 자연과학연구소 1989 忠南科學硏究誌 Vol.16 No.1
To obtain the elementary data about CdTe Schottky diode, we made Schottky Contact by electroless deposition method after growing the CdTe single crystal which has zinc blend structure with CdTe powder(4N). From the result of the experiments on the Schottky diode, we found that the reverse current in N-type Schottky diode is less than that in P-type but barrier is higher in N-type. And as the deposition time(reaction time) of Schottky Contact becomes longer or the reaction temperature higher, the barrier height and contact resistance are decreased.
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鐵-珪素 合金에서 r'-phase의 成長에 미치는 珪素의 影響
張忠根 충남대학교 자연과학연구소 1979 學術硏究誌 Vol.6 No.1
To obtain the diffusion coefficient of nitrogen in Fe-Si. alloys, the 0-5%Si-Fe alloy was nitrided by the liquid drop nitriding method in the temperature range of 650 C-800 C. The main results observed are : (1) The diffusion coefficient of nitrogen in pure iron is D_(N)= 1.02 x 10^(2) exp [(-27,200)/RT]. (2) The frequency factor D_(0) of nitrogen in 0-5%Si-Fe alloy; D_(0) (mSi) = 1.17 exp [2.65 (mSi)]. (3) The activation energy Q of nitrogen in the alloy; Q(mSi) = 27.21 exp [23.92 (mSi)]. (4) And finally, the diffusion coefficient of nitrogen in 0-5%Si-Fe alloy is D_(N)= D_(0) (mSi) exp [-Q(mSi)/RT].
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張忠根,金基元 충남대학교 자연과학연구소 1975 學術硏究誌 Vol.2 No.2
Transformation characteristics have been investigated in liquid nitrided iron by measuring electrical resistivity. Preliminary microstructure studies have also been made for the Fe-N compound and diffusion layer. An anomalous resistivity peak was observed at about 25 μ and 30 μ of the nitrogen compound and diffusion layers to the nitrogen-martensitic transformation. In the case of the magnetic transformation of nitrogen austenite, the resistivity peak was observed in the various nitrogen compounds and diffusion layers.
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강자성체 박막(Co-Ni)의 자기-저항효과에 관한 연구(II)
장충근,유중렬,남선우,손대락,Chang, C.J.,Yoo, J.Y.,Nam, S.W.,Son, D.R. 한국센서학회 1994 센서학회지 Vol.3 No.1
Grid type 70Ni-30Co thin films on slide glass at $250^{\circ}C$ has been fabricated to develope. From fabricated sensors using above process, we investigated the relation of temperature, resistivity, line width to magnetoresistance and we obtained the following results after observation of coercive force, saturated magnetization, maxium usable sensitivity, delay time, slew rate, white noise, resolution of the sensors. We confirmed that the $600{\AA}$ thin film at $250^{\circ}C$ formed crystalized magnetic anisotropy spontaneously and the sensor using the thin film had capability of detecting magnetic field with sensitivity of 230 nT. In these devices, the magnetoresistance change was increased linearly in ${\pm}10$ Oe range, and the magnetoresistance effect was increased when the ratio between line width and length was increased. When the devices was soldered using indium, the temperature-resistivity coefficient showed $8{\times}10^{-3}/deg$ and increased during the specific properties as magnetic field sensor were weakened. In this studies, the coercive forces of the films were about 5.1 A/cm and saturated magnetizations were 0.64 T, and the delay time in these devises was $5{\mu}s$ and slew rate showed 0.39 $Oe/{\mu}s$ and white noise was -120 dB. 강자성체 자기저항 센서를 개발하기 위하여 70Ni-30Co 합금을 $10^{-6}$ Torr의 진공중에서 $250^{\circ}C$ 의 슬라이드 그라스 위에 두께 $600{\AA}$ 으로 진공 증착한 후 박막을 격자형으로 식각하고 인출선을 연결하였다. 이와 같은 과정으로 제작된 센서의 자기저항 변화율에 미치는 온도, 저항, 선폭 등의 영향을 조사하고 보자력, 포화자화, 최대유효감도, 지연시간, 회전율, 백색잡음, 분해능 등을 조사 분석한 결과, (70Ni-30Co) 합금을 기판온도 $250^{\circ}C$ 에서 두께 $600{\AA}$ 으로 진공 증착하면 결정자기 이방성이 형성되어 자기저항 소자로써의 기능이 자발적으로 구비되면서 230 nT 의 최대유효감도가 구비됨을 확인하였다. ${\pm}10$ Oe 의 자장구간에서는 직선적인 자기저항변화를 보였으며, 센서소자를 형성하는 격자선의 폭에 대한 길이의 비가 클수록 자기저항 값이 증가함을 알 수 있었다. 한편 센서 소자와 인출선을 인듐으로 연결시키면 저항온도계수가 $8{\times}10^{-3}/deg$로 증가되어 센서 본연의 저항온도계수($1{\times}10^{4}/deg$)가 매우 심하게 열화된다는 것을 알 수 있었다. 이 실험에서 제작된 강자성박막(70Ni-30Co)의 특성은 보자력이 5.1 A/cm이고 포화자화가 0.64T 이었는데, 이 박막으로 제작한 자기저항 센서의 지연시간은 $5{\mu}s$이었고 회전율(slew rate)은 0.39 $Oe/{\mu}s$ 이었으며 백색잡음은 -120 dB 정도이었다.
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장충근 세계기독교통일신령협회 2003 統一世界 Vol.- No.12
2차대전 이후 승전국을 중심하고 이루어진 유엔은 기독교 국가이면서 장자국인 미국이 책임지고 참부모님을 당시에 모셨다면 섭리는 많이 단축되었을 것이다. 그러나 영적인 기독교를 대표한 한국에서 받아들이지 못하므로 준비하셨던 기대가 무너져 이렇게 긴 세월동안 탕감노정을 거쳐서 참부모님이 승리하신 터전 위에 2001년 1월 13일. 하나님 왕권수립 승리와 더불어 천일국을 선포하셨다. 그리고 그 터전 위에 이제 평화유엔을 선포하시어 섭리의 획을 긋는 순간이 되었다.
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