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- 저자 : Hinoki, T. (검색결과 6 건)
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Process development for porous Si-based ceramics by a decarburization method
박이현,Tatsuya Hinoki,Akira Kohyama 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.3
Recently, there has been an increasing interest in the applications of porous SiC ceramics as functional materials. A number of manufacturing approaches have been applied to fabricate porous SiC including polymer pyrolysis, oxidation bonding, and reaction bonding. However, these processes are complicated and conventional porous SiC shows insufficient physical and chemical stability under a high temperature environment. Therefore, from the view point of safety and stability, it is necessary to develop an uncomplicated manufacturing method for high performance porous SiC ceramics. In this study, SiC nano-powder and carbon particles have been used as starting material and pore former, respectively. Mixed powders were hot-pressed under a pressure of 20 MPa at 1900℃ for 1 h. Carbon powder which was added to the sintered body was burned out by a decarburization process in air at 700℃. The porosity was measured by the Archimedes method with an immersion medium of water and an image analysis method. The microstructure was examined by scanning electron microscopy. Mechanical properties were investigated using three-point bend test. It was established that the critical additive amount of carbon particles for porous SiC ceramics was about 20 vol.%, through the microstructure and thermogravimetric analysis during the decarburization process. The porosity of the porous SiC ceramics could be controlled with a high degree of accuracy, from the relationship between the added amount of carbon particles and porosity. The flexural strength of the porous SiC ceramics with 50% pores, where spherical pores were introduced, was about 170MPa. These porous SiC ceramics exhibited a substantially high strength in comparison with other conventionally processed porous SiC ceramics, due to their robust microstructures consisting of spherical pores.
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Kenji Shimomura,Hinoki Oikawa,Takumi Kayukawa,Satoshi Asamizu,Nobuhiro Suzuki,Shunsuke Yajima,Motohiro Tomizawa 한국응용곤충학회 2019 Journal of Asia-Pacific Entomology Vol.22 No.3
Plant-derived compounds such as essential oils (EOs) are sources of protection for stored products. In some cases, inactive ingredients that co-occur with EOs may render them more toxic or less desirable. Thus, there has been a shift away from extract-based crude mixtures to single repellent substances. The repellency activity of the capsaicin agonist, vanillyl butyl ether (VBE), which is a thermal-sense compound affecting the transient receptor potential vanilloid (TRPV) 1 channel of mammals, was investigated for control of the red flour beetle, Tribolium castaneum. The repellency activity of VBE was dose-dependent and almost comparative to DEET in an area preference test. To clarify the mode of action, RNA interference (RNAi) was used for transcriptional knockdown of two TRPV channels, Nanchung (TcNan) or Inactive (TcIav). Reduction of each of the transcript levels led to a significant decrease in VBE repellency activity, but no significant decrease in DEET repellency. These results suggested that the repellency activity of VBE was mediated by the TRPV channels, and capsaicin agonists might serve as an alternative to EOs for the protection of stored products.
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Yoon, Han Ki,Jung, Hun Chea,Hinoki, T.,Kohyama, A. 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.5
SiC/SiC복합재료는 뛰어난 고온특성, 내산화성 및 크립(Creep)에 대한 저항성이 우수하고 또한 중성자에 의한 조사 손상이 다른 세라믹스에 비해서 적게 받는다는 장점으로 인하여 핵융합로의 블랑켓(Blanket), 제1벽(First-wall) 및 다이버터(Di-vertor)등의 후보재료로 적용이 기대되고 있다. SiC/SiC복합재료 제조시 가장 큰 문제점은 높은 소결온도와 압력으로 인하여 탄화규소 섬유가 손상되어 복합재료의 특성이 저하되는 것이므로 이들 재료의 전단강도 특성 평가는 매우 중요하다, 본 연구에서는 SiC제조특성과 소결온도에 대한 전단강도 특성의 평가한다. In this study, joining methods with SiC powder as the joining adhesives were studied in order to avoid the residual stresses coming from CTE (Coefficient of Thermal Expansion) mismatch between substrate and joining layer. The shear strength and microstructure of joined material between SiC substrates are investigated. The commercial Hexoloy-SA (Saint-Gobain Ceramics, USA) used in this work as substrate material. The fine ${\beta}$-SiC nano-powder which the average particle size is below 30 nm, $Al_2O_3$, $Y_2O_3$, and $SiO_2$ were used as joining adhesives. The specimens were joined with 20MPa and $1400-1900^{\circ}C$ by hot pressing in argon atmosphere. The shear test was performed to investigate the bonding strength. The cross-section of the joint was characterized by using an optical microscope and scanning electron microscopy (SEM).
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SiC-SiC세라믹스 동종재 접합재의 전단강도 특성 평가
윤한기(Han Ki Yoon),정헌채(Hun Chea Jung),T.Hinoki,A.Kohyama 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.5
SiC-SiC복합재료는 뛰어난 고온특성, 내산화성 및 크립(creep)에 대한 저항성이 우수하고 또한 중성자에 의한 조사 손상이 다른 세라믹스에 비해서 적게 받는다는 장점으로 인하여 핵융합로의 블랑켓(blanket), 제1벽(first-wall) 및 다이버터(di-vertor) 등의 후보재료로 적용이 기대되고 있다. SiC-SiC복합재료 특성이 저하되는 것이므로 이들 재료의 전단강도 특성 평가는 매우 중요하다. 본 연구에서는 SiC제조특성과 소결온도에 대한 전단강도 특성의 평가한다. In this study, joining methods with SiC powder as the joining adhesives were studied in order to avoid the residual stresses coming from CTE (Coefficient of Thermal Expansion) mismatch between substrate and joining layer. The shear strength and microstructure of joined material between Sic substrates are investigated. The commercial Hexoloy-SA (Saint-Gobain Ceramics, USA) used in this work as substrate material. The fine β-SiC nano-powder which the average particle size is below 30 nm, Al₂O₃, Y₂O₃, and SiO₂ were used as joining adhesives. The specimens were joined with 20MPa and 1400-1900℃ by hot pressing in argon atmosphere. The shear test was performed to investigate the bonding strength. The cross-section of the joint was characterized by using an optical microscope and scanning electron microscopy(SEM).
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윤한기(Han Ki Yoon),정헌채(Hun Chea Jung),T. Hinoki,A. Kohyama 대한기계학회 2014 大韓機械學會論文集A Vol.38 No.5
SiC/SiC복합재료는 뛰어난 고온특성, 내산화성 및 크립(Creep)에 대한 저항성이 우수하고 또한 중성자에 의한 조사 손상이 다른 세라믹스에 비해서 적게 받는다는 장점으로 인하여 핵융합로의 블랑켓(Blanket), 제1벽(First-wall) 및 다이버터(Di-vertor)등의 후보재료로 적용이 기대되고 있다. SiC/SiC복합재료 제조시 가장 큰 문제점은 높은 소결온도와 압력으로 인하여 탄화규소 섬유가 손상되어 복합재료의 특성이 저하되는 것이므로 이들 재료의 전단강도 특성 평가는 매우 중요하다, 본 연구에서는 SiC제조특성과 소결온도에 대한 전단강도 특성의 평가한다. In this study, joining methods with SiC powder as the joining adhesives were studied in order to avoid the residual stresses coming from CTE (Coefficient of Thermal Expansion) mismatch between substrate and joining layer. The shear strength and microstructure of joined material between SiC substrates are investigated. The commercial Hexoloy-SA (Saint-Gobain Ceramics, USA) used in this work as substrate material. The fine β-SiC nano-powder which the average particle size is below 30 nm, Al2O3, Y2O3, and SiO2 were used as joining adhesives. The specimens were joined with 20MPa and 1400-1900oC by hot pressing in argon atmosphere. The shear test was performed to investigate the bonding strength. The cross-section of the joint was characterized by using an optical microscope and scanning electron microscopy (SEM).
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