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임채영(Jae-Young Leem),이철로(Cheul-Ro Lee),정광화(Kwang-Hwa Chung),노삼규(Sam-Kyu Noh),이연환(Yeon-Han Lee) 한국진공학회(ASCT) 1994 Applied Science and Convergence Technology Vol.3 No.2
박막성장을 위한 초고진공 응용시스템을 제작하고 이것의 특성을 사중극질량분석계로 측정하였다. 초고진공 시스템을 박막성장에 활용하기 위해서는 챔버 뿐만 아니라 펌프, 이온게이지, 전자총 등도 베이킹이 요구되었다. 또한 이온게이지와 전자총은 적어도 박막성장 20분 전에 탈가스를 하여야함을 알았다. 이 시스템으로 달성된 진공도는 7×10^(-11) torr이었다. An ultra high vacuum application system for growing thin film has been fabricated, and characteristics of the system have been measured by quadrupole mass spectrometer. Pumps, ion gage, electron gun as well as main chamber in order to use the system for thin film growth have to be baked. And also, Ion gage and electron gun must be degassed during at least 20 min before growing thin film. An ultra high vacuum of 7×10^(-11) torr was achieved using the system.
Lee, Cheul-Ro,Lee, In-Hwan,Lee, Oh-Yeon,Choi, Dae-Kyu,Jang, Seong-Hwan 전북대학교 공학연구원 ( 구 전북대학교 공업기술연구소 ) 2002 工學硏究 Vol.33 No.-
The characteristics of GaN/Si(111) epitaxial layers grown by MOVPE with Al_xGa_(1-x)N/AlN composite buffer layer(CBL) which are various x ranging from 0.07 to 0.15 in AlxGa_(1-x)N are investigated. The x values of Al_xGa_(1-x)N grown with various TMG flow rates as feeding TMA constantly are determined by TCXRD. The surface images of GaN/Si(111) epitaxy observed by SEM show the some cracks, which are due to thermal mismatch between GaN and Si. According to DCXRD rocking curves of GaN(0002), the crystal quality of GaN/Si(111) grown on Al_0.11Ga_0.89N/AlN CBL exhibits the best result with FWHM of 886 arcsec. PL spectrum at RT of the GaN/Si(111) epitaxy grown on the CBL shows a sharp band edge emission peak at 365 ㎚ with average FWHM of 45 meV, which is compared with the best result achieved so far for GaN/Si. Therefore, it can be concluded that the AlxGa_(1-x)N/AlN CBL having suitable Al molfraction of AlxGa(1-x)N layer plays an important role for improving the quality of GaN/Si(111) epitaxy by reducing the lattice and thermal mismatch between GaN and Si(111).
탄소강/Cr-주철 Bimetal 접합부의 강도에 관한 연구
천병선,이철로,임승택 대한금속재료학회(대한금속학회) 1986 대한금속·재료학회지 Vol.24 No.6
A carbon steel/Cr-cast iron bimetal produced by an alloy cored wire welding method showed a zigzag type fracture in the interface in tension tests. Results obtained from the interface were; σ_(UTS) = 29.75 (㎏/㎟) σ_(ys) =20.08 (㎏/㎟) E = 8.5 × 10^7(psi). The evaluated value of J_(IC) was 0.7 ㎏.f/㎜. Brittle fracture were observed only in the cant structure. Wear resistance of hardfaced metal was superior to that of base metal. The wear mechanism was mostly abrasive wear. but oxidation wear and adhesive wear were also activated partly.
천병선,이철로,류광현,임승택 대한금속재료학회(대한금속학회) 1987 대한금속·재료학회지 Vol.25 No.9
A bimetal was produced by a welding method. Its base metal was carbon steel containing 0.53 wt% C and the weld metal was pure copper containing 1 wt% Sn which was added as a deoxidizer. The yield strength and the ultimate tensile strength of the bimetal bonding were 6.8 ㎏/㎟ and 21.5 ㎏/㎟, respectively. The Charry V-notch impact absorption energy of the bimetal was 41.8 J/㎠ and the fracture was found to take place in copper near the interface indicating relatively high interface strength. The elastic-plastic fracture toughness value under static load, Jic, was 1.1 ㎏/㎜ and the mode of fracture was similar to that in the Charpy impact test, The wear resistance of the base metal was superior to that of SUS 304 stainless steel.