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( Sangyul Kim ),( Haruo Matsumura ),( Masaru Tanaka ) 한국폐기물자원순환학회(구 한국폐기물학회) 2015 한국폐기물자원순환학회 3RINCs초록집 Vol.2015 No.-
For the construction of a recycling-oriented society, utilization of kitchen waste, which accounts for more than 30% in Municipal Solid Waste (MSW), is important. However, incineration is the main treatment of MSW even for kitchen waste in Japan. This study examined a liquid fertilizer recycling system in the eastern region of Tottori Prefecture to promote the use of waste biomass such as kitchen waste and food waste. The results of this study showed voluntary participation of residents in separation, sealing the lid of the kitchen collection container with rubber, regular communication with users of liquid fertilizer to exchange information, and sequential contracts with businesses on the collection and treatment of food waste as well as sales of vegetables harvested in liquid fertilize were effective.
Kim, YoungSu,Kim, GwangSeok,Lee, SangYul American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.10
<P>In this study, CrZrN films were synthesized by unbalanced magnetron sputtering (UBM) under various N2 partial pressures and their characteristics such as crystalline structure, surface morphology, microstructure and mechanical properties as a function of the N2 partial pressures were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), nanoindentation, wear tests, and corrosion tests. Results revealed that, with increasing the N2 partial pressure from 0.05 to 0.21 Pa, the nitrogen content of the films increased from approximately 40.9 to 53.7 at%, the deposition rate decreased from approximately 100 to 59 nm/min and the surface roughness (Rms value) was increased from approximately 0.57 to 1.79 nm. The Cr37.3-Zr9.0-N53.7 film has the highest hardness, elastic modulus, and plastic deformation resistance of 36 GPa, 380 GPa, and 0.41, respectively. The Cr37.3-Zr9.0-N53.7 film also has the lowest friction coefficient and wear rate of 0.19 and 3.01 (10(-6)m3/Nm) at room temperature. In addition, the potentiodynamic test results showed the corrosion resistance of the CrZrN films became increased significantly and their corrosion current density (i(corr)), corrosion potentials (Ecorr) and corrosion rate decreased with increasing N2 partial pressure.</P>
SungMin Kim,EunYoung Kim,DongJun Kim,JoungHyun La,SangYul Lee 한국표면공학회 2012 한국표면공학회지 Vol.45 No.6
CrN/AlN multilayer coatings with various bilayer periods in the range of 1.8 to 7.4 nm were synthesized using a closed-field unbalanced magnetron sputtering method. Their crystalline structure, chemical compositions and mechanical properties have been investigated with Auger electron spectroscopy, X-ray diffractometry, atomic force microscopy, nanoindentation, scratch tests. The properties of the multilayer coatings varied strongly depending upon the magnitude of the bilayer period. The multilayer coating with a bilayer period of 1.8 nm showed the maximum hardness and an elastic modulus of approximately 37.6 and 417 GPa, respectively, which was 1.54 times higher than the hardness predicted by the rule of mixture from the CrN and AlN coatings. The hardness of the multilayer coating increased as the bilayer period decreased, i.e. as the rotation speed increased. The Hall-Petch type relationship, hardness being related to (1/periodicity)?“1/2, suggested by Lehoczky was confirmed for the CrN/AlN multilayer coatings with bilayer period close to the 5-10 nm range. With decreasing bilayer period, the surface morphology of the films became rougher and the critical load of films for adhesion strength gradually decreased.
비대칭 스퍼터링에 의한 TiAIN/CrN 나노 다층 박막의 합성 및 특성 분석에 관한 연구
김광석(GwangSeok Kim),김범석(Bom Sok Kim),이상율(SangYul Lee) 한국표면공학회 2005 한국표면공학회지 Vol.38 No.6
In this work a multi-layered nanostructured TiAlN/CrN superlattice coatings was synthesized using closed-field unbalanced magnetron sputtering method and the relationships between their superlattice period (1), micro-structure, hardness and elastic modulus were investigated. In addition, wear test at 500℃ and oxidation resistance test at 900℃ were performed 10 investigate high temperature properties of these thin films. The coatings were characterized in terms of microstructure and mechanical properties by transmission electron microscopy (TEM) and nano-indentation test. Results from TEM analysis showed that superlattice periods was inversely proportional to the jig rotation speed. The maximum hardness and elastic modulus of 37 ㎬ and 375 ㎬ were observed at superalttice period of 6.1 ㎚ and 4.4 ㎚, respectively. An higher value of microhardness from TiAlN/CrN thin films than either TiAlN (30 ㎬) or CrN (26 ㎬) was noted while the elastic modulus was approximately an average of TiAlN and CrN films. These enhancement effects in superlattice films could be attributed to the resistance to dislocation glide across interface between the CrN and TiAlN layers. Much improved plastic deformation resistance (H³/E²) of 0.36 from TiAlN/CrN coatings was observed, compared with 0.15 and 0.16 from TiAlN and CrN, respectively. Also the wear resistance at 500℃ was largely increased than those of single TiAlN and CrN coatings and TiAlN/CrN coatings showed much reduced weight gain after exposure at 900℃ for 20 hours.