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Preparation of Carbon Composite with High Oxidation Resistance by MoSi2 Dispersion
Goto, S.,Kodera, M.,Toda, S.,Fujimori, H.,Ioku, K. The Korean Ceramic Society 1999 The Korean journal of ceramics Vol.5 No.2
Carbon composites with $MoSi_2$ dispersion were prepared by hot-pressing at $1700^{\circ}C$ under 30 MPa for 1 h using polysilazance as binding material. The composites consisted of C, $Mo_{4.8}Si_3C_{0.6}$ and SiC. Bulk density and porosity of the carbon composites with 10 vol% $MoSi_2$ was 1.8g.$\textrm{cm}^{-3}$ and 34%, respectively. This composite was oxidized about 0.05mm from the surface of the carbon composite after oxidation test at $1500^{\circ}C$ for 10h in air. Formation of the $SiO_2$ glass layer was observed by SEM. When this composite suffered damage in the coating layer, it had hardly farther oxidation because of its self-repairing property. The composite prepared in this study indicated good oxidation resistance.
INVESTIGATION ON FERROMAGNETIC Mn₁-XCOXPt₃ ORDERED ALLOYS
T.Kaneko,H. Fujimori,H.Yoshida,K.Watanabe,S.Abe,M.Matsumoto,T.Yoshida,T.Kanomata 한국자기학회 1995 韓國磁氣學會誌 Vol.5 No.5
The magnetization of Mn_(1-X)Co_XPt₃ ordered alloys was measured at various temperatures and the pressure effect on Tc for X=0.25, 0.5 and 0.6 was examined. The X dependence of Tc determined by Arott plot has a minimum near X=0.6. The field-cooling effect measurement for X=0.5 shows a reentrant spin glass behavior. It is found that there is a concentration showing no pressure dependence of Tc between X=0.25 and 0.5. These magnetic properties are discussed with a rigid band model.
Fabrication of Deep-Sub-Millimeter-Thick Compacts Using Spark Plasma Sintering
Ohashi T.,Tanaka T.,Oshiro K.,Fujimori H.,Kurisu H.,Matsuura M.,Yamamoto S. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Nd-Fe-B type powder was sintered using spark plasma sintering method. Fabricated compact sintered at the temperature of , is found to be a composite magnet with Nd-Fe-Co-B and . The compact sintered at shows slightly low coercivity and large remanent magnetization comparing to the compact sintered at due to the formation of phase, resulting in the large maximum energy product. Maximum energy product tends to decrease with decreasing thickness of sintered compacts below 0.5 mm in thickness.
Co-Cu 과립박막의 거대자기저항 현상에 대한 조성의존성과 열처리의 영향
주승기,박주욱,고이홍의,관원귀언,등삼계안 대한금속재료학회(대한금속학회) 1994 대한금속·재료학회지 Vol.32 No.11
The composition and the annealing effect on the giant magnetoresistance of Co-Cu granular films fabricated by RF sputtering were investigated by TEM and NMR analysis. The maximum MR of 17% at 4.2K could be obtained at cobalt composition of 20 at%. From the TEM and NMR analysis, it has been found that the size of cobalt particles and the composition profile near the interfaces of cobalt particles are almost invariable with increase of cobalt concentration, while the interparticle distance decreases. Therefore, it could be concluded that the interparticle distance was mainly responsible for the existence of the maximum MR with respect to the cobalt composition in this system. According to the analysis of NMR spectrum, annealing of the films sharpened the composition profile of the interface between the cobalt particles and the copper matrix, which resulted in enhancement of the GMR values.