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도정만 ( Jung Mann Doh ),박방주 ( Bang Ju Park ),이정일 ( Jung Ii Lee ),홍경태 ( Kyung Tae Hong ) 대한금속재료학회(구 대한금속학회) 2012 대한금속·재료학회지 Vol.50 No.11
The microstructure, chemical composition, and lead isotope ratio of the Buddhist bell of Yongmoon Mountain Sangwonsa temple, which was selected as one of the three great bells of Korea by Japanese historians, were analyzed in order to estimate the origin of the material and the time of casting. The microstructure of the temple bell was composed of a copper matrix phase with α, a face centered cubit lattice structure, a δ phase with Cu41 (Sn, Ag, Sb)11 as the chemical structural formula, dispersed lead and Cu2S particles, and locally agglomerated fine particles. Through analysis of the chemical composition of the bell, a criterion (Pb: 0-3.0 wt%, Sn: 10-15 wt%) for distinguishing the bells of the Shilla dynasty from the bells of the Koryo Chosun dynasty is proposed, Examining the lead isotope ratio of 207Pb / 206Pb and 208Pb / 206Pb of the Buddhist bell of Sangwonsa temple proved that the bell was fabricated using raw materials in South Korea, which led to the conclusion that the bell was cast in Korea and the top board of the bell has been damaged by an unknown individual. The criteria of distinguishing the bells from the Shilla dynasty from the bells of the Koryo Chosun dynasty presented for the first time in this research is expected to aid in identifying and estimating the previously unclear production years of other bells.
고주파 유도 가열에 의한 나노구조 Mg<sub>4</sub>Al<sub>2</sub>Ti<sub>9</sub>O<sub>25</sub> 합성 및 소결과 기계적 성질
강현수,도정만,윤진국,손인진,Kang, Hyun-Su,Doh, Jung-Mann,Yoon, Jin-Kook,Shon, In-Jin 한국재료학회 2014 한국재료학회지 Vol.24 No.2
Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties, including high strength, high hardness, excellent ductility and toughness. In this study, nanopowders of $Al_2O_3$, MgO and $TiO_2$ were prepared as starting materials by high energy ball milling for the simultaneous synthesis and sintering of the nanostructured compound $Mg_4Al_2Ti_9O_{25}$ by high-frequency induction heating process. The highly dense nanostructured $Mg_4Al_2Ti_9O_{25}$ compound was produced within one minute by the simultaneous application of 80MPa pressure and induced current. The sintering behavior, grain size and mechanical properties of the $Mg_4Al_2Ti_9O_{25}$ compound were evaluated.
고주파유도 가열에 의한 나노구조의 텅스텐 카바이드 급속소결과 기계적 성질
강현수 ( Hyun Su Kang ),도정만 ( Jung Mann Doh ),홍경태 ( Kyung Tae Hong ),고인용 ( In Yong Ko ),손인진 ( In Jin Shon ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.11
Extremely dense WC with a relative density of up to 99% was obtained within five minutes under a pressure of 80 MPa using the High-Frequency Induction Heated Sintering method. The average grain size of the WC was about 71 nm. The advantage of this process is not only rapid densification to obtain a neartheoretical density but also the prohibition of grain growth in nano-structured materials. The hardness and fracture toughness of the dense WC produced by HFIHS were 2660 kg·mm?2 and 7.2 MPa·m1/2, respectively.
나노구조 MgAl2O4-Mg3Al2Si3O12 복합재료 합성과 동시 소결 및 기계적 성질
강현수 ( Hyun Su Kang ),도정만 ( Jung Mann Doh ),윤진국 ( Jin Kook Yoon ),손인진 ( In Jin Shon ) 대한금속재료학회(구 대한금속학회) 2014 대한금속·재료학회지 Vol.52 No.10
Nanopowders of MgO, Al2O3 and SiO2 were made by high energy ball milling. The simultaneous synthesis and consolidation of nanostuctured MgAl2O4-Mg3Al2Si3O12 composites from milled 4MgO, 2Al2O3 and 3SiO2 powders was investigated by a high-frequency induction heating process. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition of grain growth. Highly dense nanostructured MgAl2O4-Mg3Al2Si3O12 composites were produced with a simultaneous application of 80 MPa pressure and an induced current within 1 min. The relative density and fracture toughness of the composite were 98% and 3.2 MPam1/2, respectively. The fracture toughness of the MgAl2O4-Mg3Al2Si3O12 composite was higher than that of monolithic MgAl2O4.
펄스 전류 활성 연소합성에 의한 나노구조의 2MoSi<sub>2</sub>-SIC제조 및 기계적 성질
손인진,김동기,정인균,도정만,윤진국,고인용,Shon, In-Jin,Kim, Dong-Ki,Jeong, In-Kyoon,Doh, Jung-Mann,Yoon, Jin-Kook,Ko, In-Yong 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.4
Dense nanostructured $2MoSi_{2}-SiC$ composites were synthesized by the pulsed current activated combustion synthesis (PCACS) method within 3 minutes in one step from mechanically activated powders of $Mo_{2}C$ and 5Si. Simultaneous combustion synthesis and densification were accomplished under the combined effects of a pulsed current and mechanical pressure. Highly dense $2MoSi_{2}-SiC$ with relative density of up to 96% was produced under simultaneous application of a 60 MPa pressure and the pulsed current. The average grain size of $MoSi_{2}$ and SiC were about 120 nm and 90 nm, respectively. The hardness and fracture toughness values obtained were 1350 $kg/mm^{2}$ and 4 $MPa{\cdot}m^{1/2}$, respectively.
펄스 전류 가열에 의한 나노구조 MgTiO3-MgTi2O5-MgAl2O4 복합재료 합성과 동시 소결 및 기계적 성질
두송이 ( Song Lee Du ),도정만 ( Jung Mann Doh ),윤진국 ( Jin Kook Yoon ),손인진 ( In Jin Shon ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.8
Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties. As nanomaterials possess high strength, high hardness, excellent ductility and toughness, undoubtedly, more attention has been paid for the application of nanomaterials. Nanopowders of Al2O3, MgO and TiO2 were made by high energy ball milling. The simultaneous synthesis and sintering of a nanostructured MgTiO3-MgTi2O5-MgAl2O4 composite was investigated by the pulsed current heated sintering process. A highly dense nanostructured MgTiO3-MgTi2O5-MgAl2O4 composite was produced with simultaneous application of 80 MPa pressure and pulsed current within one min. The sintering behavior, gain size and mechanical properties of MgTiO3-MgTi2O5-MgAl2O4 composite were investigated. (Received December 11, 2012)
펄스전류활성가열에의한나노구조의FeAl급속소결과기계적성질
손인진 ( In Jin Shon ),고인용 ( In Yong Ko ),윤진국 ( Jin Kook Yoon ),도정만 ( Jung Mann Doh ),조승훈 ( Seung Hoon Jo ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.7
Nanopowder of FeAl was synthesized by high energy ball milling. Using the pulsed current activated sintering method, a dense nanostuctured FeAl was consolidated within 2 minutes from mechanically synthesized powders of FeAl and horizontally milled powders of Fe+Al. The grain size and hardness of FeAl sintered from horizontally milled Fe+Al powders and high energy ball milled FeAl powder were 150 nm, 50 nm and 466 kg/mm2, 574 kg/mm2, respectively.
기계적 활성화된 분말로부터 고주파유도 가열 연소합성에 의한 나노구조 Mg2SiO4-MgAl2O4 복합재료 제조 및 기계적 특성
손인진 ( In Jin Shon ),강현수 ( Hyun Su Kang ),홍경태 ( Kyung Tae Hong ),도정만 ( Jung Mann Doh ),윤진국 ( Jin Kook Yoon ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.8
Nanopowders of MgO, Al2O3 and SiO2 were made by high energy ball milling. The rapid sintering of nanostructured MgAl2O4-Mg2SiO4 composites was investigated by a high-frequency induction heating sintering process. The advantage of this process is that it allows very quick densification to near theoretical density and inhibition of grain growth. Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties. As nanomaterials possess high strength, high hardness, excellent ductility and toughness, undoubtedly, more attention has been paid for the application of nanomaterials. Highly dense nanostructured MgAl2O4-Mg2SiO4 composites were produced with simultaneous application of 80MPa pressure and induced output current of total power capacity (15 kW) within 2min. The sintering behavior, gain size and mechanical properties of MgAl2O4-Mg2SiO4 composites were investigated.
Fe-Al과 Fe-Cr계 합금의 내 산화성에 미치는 Al과 Cr의 영향
김태완 ( Tae Wan Kim ),조승훈 ( Seung Hoon Jo ),고인용 ( In Yong Ko ),도정만 ( JUng Mann Doh ),윤진국 ( Jin Kook Yoon ),손인진 ( In Jin Shon ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.11
The effects of Cr and Al contents in Fe-Al and Fe-Cr alloys on oxidation resistance, hardness, and the thermal expansion coefficient were investigated. Fe-Al and Fe-Cr alloys above 10wt.%Al and 20wt.%Cr contents have a high oxidation resistance. The hardness of the Fe-Al and Fe-Cr alloys increased with an increase in Al and Cr contents due to solid solution or formation of an intermetallic compound. The coefficients of thermal expansion of the Fe-Al alloys were higher than those of the Fe-Cr alloys because the coefficient of thermal expansion of Al was higher than that of Fe and Cr.