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Al-Al_2O_3 입자분산 복합재료의 제조조건과 합금원소 첨가에 따른 분산성에 관한 연구
서찬열,이종욱,박영구 전북대학교 공업기술연구소 1990 工學硏究 Vol.21 No.-
Al-Al_2O_3 particulate reinforced composites were prepared by compocasting. The dispersion behaviors of Al-AL_2O_3 particles at different processing method and allying elements addition were examined by optical microscope, image analyser and X-ray diffraction. The dispersion of AL_2O_3 particles in the Al-Cu matrix alloy could not be detected however it was found to improve the dispersion by the addition of Ca, Si or Mg in Al or Al-Cu alloy. And the dispersion and recovery of Al_2O_3 particle in the ternary Al-Cu-Mg and Al-Cu-Ca matrix alloys wer better than the binary alloy. After mixing and reheating treatment the agitation was necessary to improve the dispersion. The longer the holding time of the melt before solidification, the more flotation of the agglomerates of the particles occured, and so agglomerates and shrinkage cavities in the ingot were reduced. But the dispersion of the fine particles in the rapid cooled ingot were improved. Finally, X-ray diffraction studies exhibited that Al_2siO5, MgO, MgAl_2O_4, CaO, Caal_2O_4 and Cu_2MgO_3 were formed at the interface of Al/Al_2O_3 And those product phases were though to improve the wettability of particles, also it may have played a helpful role of thier dispersion in the melts
마이크로 패턴 성형을 위한 인서트 코어 적용 µ-PIM 표준금형 개발에 관한 연구
박치열,서찬열,김용대,Park, Chi Yoel,Seo, Chan-Yoel,Kim, Yongdae 한국금형공학회 2017 한국금형공학회지 Vol.11 No.3
Increased demand for parts with micro-pattern structure made of metals, ceramics, and composites in various fields such as medical ultrasonic sensors, CT collimators, and ultra-small actuator parts. Micro powder injection molding (PIM) is a technology for manufacturing micro size, high volume, complex, precision, net-shape components from either metal or ceramic powder. In the present study, a standard mold with a variable insert core capable of producing various micro patterns was investigated. An injection molding test was performed on a standard mold using a line type micro-pattern core having an aspect ratio of 2, a slenderness ratio of 70, a pattern size of $200{\mu}m$, and a pattern spacing of $150{\mu}m$. During the filling process, the deformation of the mold with large aspect ratio and slenderness ratio was analyzed by the experiment and the numerical simulation according to the position of the gate. We proposed a mold structure that minimizes mold deformation by gate modification and enables uniform pattern filling behavior.
아크이온플레이팅 법을 이용한 대형 공구물의 TiN/TiCN/TiC 코팅층 분석
백경철,서찬열,허기복,김병일,윤동주,이경구,양현삼 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
공구수명의 향상을 위하여 많은 연구개발이 되고 있으며 그 중 대형 공구물의 기계적 성질을 높이기 위하여 PVD방법인 Arc Ion Plating법을 이용하여 표면코팅을 하였으며 TiN/TiCN/TiC의 코팅을 하여 코팅층 분석을 실시하였다. 코팅층에 따라 증착속도는 다르게 나타났으며, TiN 1.5㎛/hr, TiCN은 1.7㎛/hr, TiC는 1.5㎛/min으로 나타났으며 코팅막에 따라 경도가 TiN 1960Hv, TiCN 2274Hv, TiC 2,899Hv를 보였다. 또한 기판위에 TiN 박막을 우선 성장시킨 후, 그 표면의 TiCN을 성장시킨 경우에는 표면의 TiCN 박막은 처음의 TiN 박막의 우선 성장 방향에 크게 영향을 받으면서 성장한 결과, TiCN 단일 박막인 경우 (111), (200) 우선방위보다는 오히려 TiN 박막의 (111) 우선성장 방위로 성장하였다고 사료되었다.
마이크로 패턴 성형을 위한 인서트 코어 적용 µ-PIM 표준금형 개발에 관한 연구
박치열,서찬열,김용대 한국금형공학회 2017 한국금형공학회지 Vol.11 No.3
Increased demand for parts with micro-pattern structure made of metals, ceramics, and composites in various fields such as medical ultrasonic sensors, CT collimators, and ultra-small actuator parts. Micro powder injection molding (PIM) is a technology for manufacturing micro size, high volume, complex, precision, net-shape components from either metal or ceramic powder. In the present study, a standard mold with a variable insert core capable of producing various micro patterns was investigated. An injection molding test was performed on a standard mold using a line type micro-pattern core having an aspect ratio of 2, a slenderness ratio of 70, a pattern size of $200{\mu}m$ 수식 이미지, and a pattern spacing of $150{\mu}m$ 수식 이미지. During the filling process, the deformation of the mold with large aspect ratio and slenderness ratio was analyzed by the experiment and the numerical simulation according to the position of the gate. We proposed a mold structure that minimizes mold deformation by gate modification and enables uniform pattern filling behavior.
Al-Al_2O_3粒子强化 複合材料에 있어서 合金造成에 따른 微細組織의 變化
이종욱,서찬열,박영구 전북대학교 공업기술연구소 1991 工學硏究 Vol.22 No.-
AI-AI_2O_3 particulate reinforced composites were investigated. The effect of alloying elements was studied for their microstructural features, dispersion behaviors, reaction products at the interface, concentration lamellas of alloying elements around particles and microhardness from matrix to matrix/particle interface. AI-AI_2O_3 composites were prepared by compocasting method The results are as follows : for homogeneous dispersion of AI_@O# particles in the matrix, a certain amount of MG or CA is required. Those are 0.3 wt.% Mg or 0.! wt.% ca. in the case of AI-Cu/AI_2O_3 composite, some AI_2O_3 particles in Al-Si/Al_2O_3 composite tends to change the acicular eutectic silicons for equiaxed eutectic silicons. X-3ay diffraction studies reveal that some reaction products were formed by certain chemical reactions at the matrix/particles interfaces. The reaction products were MgAl_2O_4, CaAl_2O_4, Al_2SiO_5, CaO, MgO, caAl_4O_7, Cu_2MgO_3 and so on. those phases were thought to improve the wettability and to uniform dispersion of Al_2O_3 particles in the matrix. The concentration lamellas of alloying elements were observed around particles by EPMA. The microhardness of the matrix/particles interfaces is higher than that of matrix due to those reaction products..
Zr계 수소저장합금의 전극특성에 미치는 은 첨가의 영향
노학,정소이,최승준,최전,서찬열,박충년,Noh, Hak,Jeong, So-yi,Choi, Seung-jun,Choi, Jeon,Seo, Chan-yeol,Park, Choong-Nyeon 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.3
The effects of Ag addition to Zr-based hydrogen storage alloys ($Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.4}$, $Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.3}Cr_{0.1}$ and $Zr_{0.6}Ti_{0.4}V_{0.4}Ni_{1.2}Mn_{0.3}Fe_{0.1}$) on the electrode properties were examined. Ag-free and Ag-added Ze-based alloys were prepared by arc melting, crushed mechanically, and subjected to the electrochemical measurement. In $Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.4}$ alloy, 0.08 wt% Ag addition to the alloy improved the activation rate. Also Ag addition improved both activation property and discharge capacity in $Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.3}Cr_{0.1}$. For these Ag-added alloys, discharge capacities with the change of charge-discharge current density(10mA, 15mA and 30mA) are almost constant. Showing very high rate capability, discharge capacity of $Zr_{0.6}Ti_{0.4}V_{0.4}Ni_{1.2}Mn_{0.3}Fe_{0.1}$ alloy increased by Ag addition to the alloy. When the amount of Ag addition in $Zr_{0.7}Ti_{0.3}V_{0.4}Ni_{1.2}Mn_{0.4}$ alloy increased too much, the electrode properties became worse. Unveiling mechanism of effect of Ag addition is now progressing in our laboratory.
Ni-MH 2차 전지용 Zr 계 수소저장합금전극의 특성에 미치는 치환원소 (Co, Cr, Fe) 의 영향
최승준(Seung Jun Choi),정소이(So Yi Jung),서찬열(Chan Yeol Seo),최전(Jeon Choi),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1999 한국수소 및 신에너지학회논문집 Vol.10 No.3
Effects of alloy modification with the Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub> alloy for an electrode use have been investigated. For the alloy composition, a part of Mn was substituted by Co, Cr and Fe. The experimental results showed that Co accelerated activation of alloy, and Fe and Cr improved the discharge capacity. These results agree with P-C-T curves of each alloy. But substituting Fe for Mn showed the decrease of the discharge capacity when discharged at high rate (60㎃, about 1C rate). Considering both the discharge capacity and the high rate discharge property, Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub> alloy was found to be the best alloy among the alloys subjected to the test.
Zr계 수소저장합금의 전극특성에 미치는 은 첨가의 영향
노학(Hak Noh),정소이(So Yi Jeong),최승준(Seung Jun Choi),최전(Jeon Choi),서찬열(Chan Yeol Seo),박충년(Choong Nyeon Park) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.3
The effects of Ag addition to Zr-based hydrogen storage alloys (Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub>, Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub> and Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Fe<sub>0.1</sub>) on the electrode properties were examined. Ag-free and Ag-added Ze-based alloys were prepared by arc melting, crushed mechanically, and subjected to the electrochemical measurement. In Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub> alloy, 0.08 wt% Ag addition to the alloy improved the activation rate. Also Ag addition improved both activation property and discharge capacity in Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Cr<sub>0.1</sub>. For these Ag-added alloys, discharge capacities with the change of charge-discharge current density(10㎃, 15㎃ and 30㎃) are almost constant. Showing very high rate capability, discharge capacity of Zr<sub>0.6</sub>Ti<sub>0.4</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.3</sub>Fe<sub>0.1</sub> alloy increased by Ag addition to the alloy. When the amount of Ag addition in Zr<sub>0.7</sub>Ti<sub>0.3</sub>V<sub>0.4</sub>Ni<sub>1.2</sub>Mn<sub>0.4</sub> allay increased too much, the electrode properties became worse. Unveiling mechanism of effect of Ag addition is now progressing in our laboratory.