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논문 : 표면처리 ; Mo기판에서 Si의 화학증착에 관한 연구
윤진국 ( Jin Kook Yoon ),정병성 ( Byoung Seong Jeong ),고흥석 ( Hung Suk Ko ),김재수 ( Jae Soo Kim ),최종술 ( Chong Sool Choi ) 대한금속재료학회 ( 구 대한금속학회 ) 1998 대한금속·재료학회지 Vol.36 No.7
Under deposition conditions limited by gas transport, the chemical vapor deposition of silicon on molybdenum substrate was investigated in the temperature range of 1173K and 1473K using hot-wall horizontal reactor and SiCl4-H2 gas mixtures. The deposition amount of silicon increased proportionally to the square root of total flow rate of reactants in which the outer layer of molybdenum substrate was pure silicon at 1173K, but to the quarter of that in which that was MoSi2 at 1473K. The deposition rate of silicon obeyed linear law at pure silicon but parabolic law at MoSi2. This suggested that the deposition rate of silicon was dependent on the concentration of silicon on substrate surface because the gaseous diffusion flux of reactants through a boundary layer was a function of that. This phenomenon was confirmed by the results obtained at 1298K that the deposition rate of silicon obeyed parabolic law below 4.3 hrs and changed linear law over 4.3 hrs.
논문 : 기계적 활성화된 분말로부터 펄스전류활성 연소합성에 의한 나노구조 Al2O3-MgSiO3-SiO2복합재료 제조 및 기계적 특성
손인진 ( In Jin Shon ),강현수 ( Hyun Su Kang ),도정만 ( Jung Mann Doh ),윤진국 ( Jin Kook Yoon ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.7
Nanopowders of MgO, Al2O3 and SiO2 were made by high-energy ball milling. The fast sintering of nanostructured Al2O3-MgSiO3-SiO2 composites was investigated from mechanically activated powders of MgO, Al2O3 and SiO2 by a pulsed-current activated sintering process. Nanocrystalline materials have received much attention as advanced engineering materials with improved physical and mechanical properties; in particular greater strength, hardness, excellent ductility and toughness. Highly dense nanostructured Al2O3-MgSiO3-SiO2 composites were produced with simultaneous application of 80 MPa and pulsed output current of 2800A within 2 minutes. The sintering behavior, grain size and mechanical properties of Al2O3-MgSiO3-SiO2 composites were investigated.
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.
기계화학적 합성과 나노구조 CoZr-ZrO<sub>2</sub> 복합재료 소결
손인진 ( In-jin Shon ),윤진국 ( Jin-kook Yoon ),홍경태 ( Kyung-tae Hong ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.9
Abstract: Since their development in the 1970s ZrO<sub>2</sub> ceramics have been shown to be promising alternative materials for total hip arthroplasty (THA) and total knee arthroplasty (TKA). However, ZrO<sub>2</sub> is so brittle that in vivo failure can result from fracture of the ceramic femoral head and fracture of the ceramic acetabular liner due to the low toughness of the ceramics. To improve its fracture toughness, the approach commonly utilized has been the addition of a second phase to form a composite and produce nanostructured materials. The purpose of this study was to produce a mechanical synthesis of CoZr and ZrO<sub>2</sub> nanopowders from CoO and Zr powders, and fabricate dense nanocrystalline 2CoZr-ZrO<sub>2</sub> composites within two minutes using this pulsed current activated sintering method. Their mechanical properties, biocompatibility and microstructure were then evaluated. Nanopowders of CoZr and ZrO<sub>2</sub> were synthesized mechanochemically according to the reaction (2 CoO + 3 Zr → 2CoZr + ZrO<sub>2</sub>) from CoO and Zr powders by high-energy ball milling. The synthesized powders were consolidated by the pulsed current activated sintering method within two minutes under 80Mpa pressure. CoZr and ZrO<sub>2</sub> composite was sintered by the rapid heating of the nanophase. The hardness and fracture toughness of the 2 CoZr-ZrO<sub>2</sub> composite in this study were better than the hardness of monolithic CoZr and the fracture toughness of a monolithic ZrO<sub>2</sub>. Additionally, the 2 CoZr-ZrO<sub>2</sub> composite exhibited good biocompatibility. (Received January 18, 2017; Accepted February 18, 2017)
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.
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.
손인진 ( In Jin Shon ),조형곤 ( Hyoung Gon Jo ),김병수 ( Byung Su Kim ),윤진국 ( Jin Kook Yoon ),홍경태 ( Kyung Tae Hong ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.7
For the formation of cemented Tic composite, Co or Ni is added as a binder. However, the high cost and low hardness of Co or Ni as binder and the low corrosion resistance of Tic-Co and Tic-Ni composite have generated interest to find alternative binder materials. It has been reported that FeAl show higher oxidation resistance and hardness as well as low cost compared to Co or Ni. Highly dense nanocrysatlline Tic and Tic-FelAl with a relative desity of up to 100% were obtained within 2 min by PCAS(pulsed current activated sintering) under the condition of 80MPa and up to 1300. The effect of FeAl addition of FeAl on the consolidation, the microstructure and the mechanical properties (hardness and fracture toughness) of TiC were investigated. The fracture toughness of TiC greatly increases without great decrease of the hardness by addition of FeAl. Not only fracture toughness but also hardness values of TiC-10vol.%FeAl were higher than those of TiC-10vol.%Fe, TiC-10vol.%Ni and TiC-10vol.%Co.
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.