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직접질화법에 의한 (Ti , Al)N계 복합질화물의 합성 (1)
손용운,이영기,황연,조영수,김석윤 ( Yong Un Sohn,Young Ki Lee,Yeon Hwang,Young Soo Cho,Suk Yoon Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.3
TiN and AlN are ceramic materials with mechanical and chemical properties for use in structural applications at elevated temperature. The purpose of this research is to develop the technology for the synthesis of (Ti. Al)N power, which shows simultancously the excellent properties of TiN and AlN, from the mixed powder(Ti_(0.25) Al_(0.75), Ti_(0.5) Al_(0.5) and Ti_(0.75) Al_(0.25)) by the direct nitriding method. The effects of variables such as temperature, mixing ratio of Al to Ti in raw material were investigated. The(Ti, Al)N powder can be easily synthesized from the mixed powder by the direct nitriding method. Among the mixed powdres, the rutriding behavior decreased with increasing the ratio of Al to Ti. This behavior is well explained by the nitriding mechanism presented in this research.
이영기,손용운,조영수,김용석,김석윤 ( Young Ki Lee,Yong Un Sohn,Young Soo Cho,Yong Seog Kim,Suk Yoon Kim ) 한국열처리공학회 1995 熱處理工學會誌 Vol.8 No.2
The nitridation kinetics of titanium powder were studied by isothermal and non-isothermal (dynamic) methods in high purity nitrogen under 1 atm pressure. For the comparison with nitridation, the oxidation kinetics of titanium powder were also studied in dry oxygen at 1 atm pressure. An automatic recording electrobalance was used to measure the weight gain as a function of time and temperature. For the reaction with nitrogen, the nitride was formed at over 700℃. The reaction with nitrogen followed the parabolic rate law, and the activation energy was calculated to be 31 ㎉/㏖ in the isothermal method (above 900℃). The non-stoichiometric TiNx has been synthesized by the nitridation at a proper temperature and time, followed by the homogenizing treatment above 1100℃. In comparison with the stoichiometric TiN_(1.0) and the non-stoichiometric TiNx(TiN_(0.5) and TiN_(0.65)), the hot oxidation characteristics of the former is superior to that of the latter. However, both non-stoichiometric nitrides make little difference in the hot oxidation characteristics.
이현승(Hyun-Seung Lee),이영신(Young-Shin Lee),백준호(Joon-Ho Baek),천병선(Byong-Sun Chun),김석윤(Suk-Yoon Kim),이재옥(Jae-Wook Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The wedge-type pipe joint which is adapted for pipelines can improve workability, functionability and economical aspects significantly more than existing pipe joint. The work is significantly reduced because wedge-type pipe joint can joining pipe by one ?touch action. The wedge-type pipe joint is composed of wedge-type stopper, spring and housing. The wedge-type stopper moves along the tilted surface of the housing and securely fixes the pipe. In this study, the structural contact analysis on multi-groove stopper of the wedge-type pipe joint is carried out by finite element analysis. Results of the contact analysis according to housing angle, optimized angle of housing are 9.75°.
이현승(Hyun-Seung Lee),이영신(Young-Shin Lee),백준호(Joon-Ho Baek),천병선(Byong-Sun Chun),김석윤(Suk-Yoon Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
The X-ring is a loop of elastomer with X-ring cross-section used as a mechanical seal or gasket. X-ring is designed to be seated in a groove and compressed during assembly between two or more parts, creating a seal at the interface. The seal is designed to have line contact between the x-ring and sealing faces. This study aims to detect contact stress and deformed shape of X-ring shell with various compression conditions. For this analysis, four experiments were conducted to obtain material properties of elastomer. The contact stress analysis is performed by applying material properties that obtain data through experiments. A contact stress analysis is carried out by finite element analysis. As a result of contact analysis about X-ring and O-ring with variable compression rate, the X-ring is more airtight than the O-ring. Also, X-ring keep up the double seal until compression rates are from 0% to 20%.
이현승(Hyun-Seung Lee),이영신(Young-Shin Lee),이중현(Jung-Hyun Lee),천병선(Byong-Sun Chun),백준호(Joon-Ho Baek),김석윤(Suk-Yoon Kim) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.9
The X-ring is a elastomer with X-shaped cross-section used as a mechanical seal or gasket. Such a X-ring was equipped in a groove and compressed between two or more parts, acts as a seal on the interface. This study aims to detect contact stress and deformed shape of a X?shaped ring shell under various compressive contact conditions. A contact stress analysis was carried out by finite element analysis. The effect of compression rates and thickness design variable was analyzed. X-ring kept up the double seal until a compression rate of 20 %. The maximum stresses of the X-ring was occurred at the top and bottom corner. The maximum contact stress of X-ring was rapidly increased according with the compression rate. The X-rings with thickness design variable from 1.3 mm to 1.5 mm had comparative low stress levels.
TiC 被覆한 SiC纖維(Nicalon)의 알루미늄 基地에 對한 適合性
金錫胤,南勝義,金政根 弘益大學校 1983 弘大論叢 Vol.15 No.2
The interaction between SiC fiber and coated aluminum layer of commercially available SiC fiber vacuum-deposited by aluminum was studied at temperatures between room temperature and 700℃. In order to suppress the reaction between the SiC fiber and aluminum layer, thermodynamically stale TiC was precoated on the SiC fiber by activated reactive evaporation process prior to aluminum coating and the compatibility of TiC coated SiC fiber with aluminum have been investigated. Then the interaction of the SiC fiber and the coated aluminum layer was also studied between room temperature and 700℃. The fiber coating with TiC is ecpected to be effective for fabricating a sound composite in this system. The fiber coating with TiC is expected to be effective for fabricating a sound composite in this system. The wettability between SiC fiber and liquid aluminum was improved by the TiC coating. Aluminum coated SiC fiber heated at 650℃ was black and brittle, while no black and brittle was TiC and aluminum coated SiC fiber heated at the same temperaturer. It was, therefore, concluded that the TiC pre-coating on the SiC fiber was effective in suppressing the interation of the SiC fiber and the coated aluminum layer.
Al₂O₃纖維 强化 알루미늄 複合材料에서 合金元素 添加가 界面反應에 미치는 影響
金錫胤,宋在京,金政根 弘益大學校 1986 弘大論叢 Vol.18 No.2
In the fabrication of the fiber reinforced aluminum alloy composites was made by liquid metal vacuum infiltration. Emphasis was placed on the study addition of alloying elements to matrices and interface interactions between fiber and matrices. Al₂O₃fiber well wetted in Al-Mg, Al-Li and poorly in Al-Cu-Mg alloys but pure Al and Al-Cu matrices bad wetted. The distribution of constituents at the interaction zones between reinforcements and matrices was analysed by EDS and WDS.
섬유 강화 금속복합재료의 제조와 크리프 및 피로 특성 (1)
김석윤,현창용,성홍석 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.2
The fabrication and creep chararteristics of composites reinforced with stainless steel and high carbon steel fibers haute been studied. The Ni-coating, Cu-coating and bear fibers have been tested to examine the effect of fiber surface characteristics. In order to make various fiber volume fraction composite specimen, the liquid casting method has been applied. Creep characteristics such as the rupture time and the steady state creep rate have been investigated in the range of stress with 22.47 to 72.95MPa at 537k. The rupture time is increased with V_f. The stress exponent(n) has been found to be 21.2∼114. In case of V_f 1.6, 2.88%, 100hr rupture stress(δ) was less than theoritical value calculated by the rule-of-mixture(R.0.M). On the other hand V_f 3.52%, shows δ value close to R.O.M, and coated composites were even larger than R. O. M. Severa1 intermetallic compound such as A1Ni, Al₂Cu, Al_5Fe₃and Al_(13)Fe₄in the interface were observed by TEM. These improved wettability of fiber on matrix, and creep strength due to obstruction of dislocation moving. Tested specimen shows dislocation cells at the substructure. The dislocation density decreased from interface to matrix.