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Electrochemical Performance of Al-Si/C Nano-Composites Fabricated by Arc-Discharge Method
Kelimu Tulugan,윤한기,박원조 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.3
The microstructures and cyclic voltammograms of Al-Si/C nano-composites were investigated as the anode of lithium ion batteries. Al-Si nanoparticles were prepared by the arc-discharge method. Al-Si/C nanoparticles were obtained by coated Al-Si nanoparticles with the precursor of glucose (C6H12O6) as carbon source. It was indicated that the post carbon coating treatment can reduce Al2O3 film on Al-Si particles, and new phase Al4C3 formed in the process can activate the inactivated materials of electrode in a certain extent.
Tensile Property and Residual Stresses in Dissimilar Aluminiums Friction Stir Welding
Kelimu Tulugan,WonJun Lee,HanKi Yoon,WonJo Park,SunChul Huh 대한조선학회 2012 대한조선학회 학술대회자료집 Vol.2012 No.5
Friction stir welding has the advantage that many of the welding parameters, e.g. tool design, rotation speed and travelling speed, can be controlled in a precise manner, thus controlling the energy input into the system. Therefore, the micro-structure of the welding aluminium were tested, the residual stresses induced by the friction stir welding process conducted with 500rpm and 100mm/min was also measured. The stresses in the test specimen peaked at -9Mpa and had the conventional "M" profile.
Kelimu Tulugan,Han-Ki Yoon,Won-Jo Park 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.3
The microstructures and cyclic voltammograms of Al-Si/C nano-composites were investigated as the anode of lithium ion batteries. Al-Si nanoparticles were prepared by the arc-discharge method. Al-Si/C nanoparticles were obtained by coated Al-Si nanoparticles with the precursor of glucose (C6H12O6) as carbon source. It was indicated that the post carbon coating treatment can reduce Al2O3 film on Al-Si particles, and new phase Al4C3 formed in the process can activate the inactivated materials of electrode in a certain extent.
저압함침법을 이용한 Ni 과 Ni-Cr으로 강화된 AC8A 복합재료의 마모특성
Kelimu Tulugan,황규완,박원조 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.2
Ni and Ni-Cr reinforced Al alloy (AC8A) composites were fabricated by low pressure infiltration process. Porous Ni was applied as preform. Ni reinforced AC8A composites were fabricated under 0.3 MPa at 650, 700 and 750 degrees centigrade, respectively, while Ni-Cr reinforced AC8A composites were fabricated under low pressure limited to the maximum of 0.5 Mpa at 750, 800 and 850 degrees centigrade, respectively. Microstructure and phase composition of the composites were evaluated by optical microscope, X-Ray diffraction (XRD), electro-probe micro analyzer (EMPA). Intermetallic compounds Al3Ni and CrSi were observed in the composites. The results indicate that the grain size has been increasing with the increase of the infiltration temperatures. However, the wear resistance of Ni/AC8A and Ni-Cr AC8A peaked at 650 degree centigrade and 800 degrees centigrade, respectively. In addition, based on the wear characteristics and wear surfaces, Ni-Cr/AC8A composites have a better wear resistance than Ni/AC8A composites and AC8A.
Tensile Property and Residual Stresses in Dissimilar Aluminiums Friction Stir Welding
Kelimu Tulugan,WonJun Lee,HanKi Yoon,SunChul Huh,WonJo Park 한국해양환경·에너지학회 2012 한국해양환경공학회 학술대회논문집 Vol.2012 No.5
Friction stir welding has the advantage that many of the welding parameters, eg. tool design, rotation speed and travelling speed, can be contralled in a precise manner, thus controlling the energy input into the system. Therefore, the micro-structure of the welding aluminium were tested, the residual stresses induced by the friction stir welding process conducted with 500rpm and 100mm/min was also measured. The stresses in the test specimen peaked at -9Mpa and had the conventional "M" profile.
Wear behavior of Ni and Ni-Cr enhanced AC8A composites by low pressure infiltration process
Kelimu Tulugan,황규완,박원조 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.2
Ni and Ni-Cr reinforced Al alloy (AC8A) composites were fabricated by low pressure infiltration process. Porous Ni was applied as preform. Ni reinforced AC8A composites were fabricated under 0.3 MPa at 650, 700 and 750 degrees centigrade, respectively, while Ni-Cr reinforced AC8A composites were fabricated under low pressure limited to the maximum of 0.5 Mpa at 750, 800 and 850 degrees centigrade, respectively. Microstructure and phase composition of the composites were evaluated by optical microscope, X-Ray diffraction (XRD), electro-probe micro analyzer (EMPA). Intermetallic compounds Al3Ni and CrSi were observed in the composites. The results indicate that the grain size has been increasing with the increase of the infiltration temperatures. However, the wear resistance of Ni/AC8A and Ni-Cr AC8A peaked at 650 degree centigrade and 800 degrees centigrade, respectively. In addition, based on the wear characteristics and wear surfaces, Ni-Cr/AC8A composites have a better wear resistance than Ni/AC8A composites and AC8A.