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윤진국,손인진 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.7
Despite of many attractive properties of TiCo, TiCo in industry has been limited due to low fracture toughness and a lowhardness. The mechanical properties can be improved significantly by reinforcing TiCo with hard ceramic particles such asAl2O3 and by fabrication of nanostructured composite. Nanomaterials have received a good deal of attention recently as theypossess high strength, high hardness, excellent ductility and toughness. In recent days, nanocrystalline powders have beendeveloped by the thermochemical and thermomechanical process named as the spray conversion process (SCP), coprecipitationand high energy milling. Nano-powders of TiCo and Al2O3 were synthesized from CoTiO3 and 2Al powders byhigh energy ball milling. Nanocrystalline Al2O3 reinforced composite was consolidated by high frequency induction heatedsintering within one minute from mechanochemically synthesized powders of Al2O3 and TiCo. The relative density of thecomposite was 98%. The average hardness and fracture toughness values obtained were 1180 kg/mm2and 8.5 MPa·m1/2,respectively.
윤진국,손인진 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.8
Nanopowders of AlCr2 and Al2O3 were synthesized during high energy ball milling. Densely nanostructured AlCr2-2Al2O3composite was consolidated by high-frequency induction heated sintering within 2 min from milled powders. Highly denseAlCr2-2Al2O3 composite with relative density of up to 96% was produced under application of a 80 MPa pressure and theinduced current. The fracture toughness of a AlCr2-Al2O3 composite in this study is similar to that of previous study, whilethe hardness of a AlCr2-Al2O3 composite in this study is better than that of previous study due to the grain refinement. Thefracture toughness of AlCr2-2Al2O3 composite is higher than that of pure Al2O3. The microstructure and mechanical propertieswere investigated using FE-SEM with EDS and Vickers hardness tester.
윤진국,손인진 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.6
Nanopowders of TiO and Al were fabricated using high energy ball milling. Dense nanostuctured 3Ti-Al2O3 composite wassimultaneously synthesized and sintered by pulsed current activated heating within 2 min in one step from mechanicallyactivated powders of 3TiO and 2Al. The advantage of this process is that it allows very quick densification to near theoreticaldensity and prohibition of grain growth in nanostructured materials. Highly dense 3Ti-Al2O3 with relative density of up to99.9% was produced under simultaneous application of a 80 MPa pressure and the pulsed current. The average hardness andfracture toughness values of the composite were 1439 kg/mm2and 7 MPa • m1/2, respectively.
표준 CMOS 공정을 사용한 저 전력 싱글 폴리 EEPROM
윤진국(Jin-kook Yun),김장수(Jang-su Kim),양병도(Byung-do Yang) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.11
In this paper, a low power single poly EEPROM is implemented with a standard CMOS process. It uses the FN-tunneling method for erase and program operation to reduce the power consumption. The n-type LOMOS and stacked PMOS structure are used for high voltage operation with low breakdown voltage transistors of the standard CMOS process. A 7V operating 1Kbyte EEPROM is fabricated with a 1.8V 0.18㎛ standard CMOS process.
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.
Enhanced Properties of Nanostructured TiO2-Graphene Composites by Rapid Sintering
손인진,윤진국,홍경태 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.1
Despite of many attractive properties of TiO2, the drawback of TiO2 ceramic is low fracture toughness for widelyindustrial application. The method to improve the fracture toughness and hardness has been reported by addition ofreinforcing phase to fabricate a nanostructured composite. In this regard, graphene has been evaluated as an idealsecond phase in ceramics. Nearly full density of nanostructured TiO2-graphene composite was achieved withinone min using pulsed current activated sintering. The effect of graphene on microstructure, fracture toughness andhardness of TiO2-graphene composite was evaluated using Vickers hardness tester and field emission scanningelectron microscopy. The grain size of TiO2 in the TiO2-x vol% (x = 0, 1, 3, and 5) graphene composite was greatlyreduced with increase in addition of graphene. Both hardness and fracture toughness of TiO2-graphene compositessimultaneously increased in the addition of graphene.