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주철의 기지조직에 (基地組織) 미치는 Mischmetal Hydride 의 첨가효과
최답천,진영철 ( Dap Chun Choi,Young Chul Jin ) 한국주조공학회 1988 한국주조공학회지 Vol.8 No.4
N/A In this study we have investigated the effects of Mm, MmH and MmH₂ on the matrix development in cast iron, The conclusive summary is as follows : The spheroidal graphite was observed when 0.5wt.% or more of mischmetal was added and the matrix was of ledeburite structure, but hull`s eye structure was not observed. On the other hand, the bulls eye structure was observed when 0.25wt.% of MmH, or 0.25wt.% to 0.5wt.% of MmH₂was added. Above limit of the additives, the matrix changed into ledeburite structure. As the hydrogen content of mischmetal compound increased from MmH, the range of additives to obtain bulls eye structure expanded. This reveals the significant effect of mischmetal hydride on matrix development in cast iron and the possibility of practical use of the additives.
DV-Xα 분자궤도법을 이용한 Li, Fe 의 첨가에 따른 TiS2 의 전자상태 계산에 관한 연구
김양수,진영철,박화수,장명철 대한금속재료학회(대한금속학회) 2000 대한금속·재료학회지 Vol.38 No.6
Discrete-variational(DV)-Xα method has been applied to investigate the electronic structures of layered compound TiS₂ intercalated with Li or Fe. The chemical bonding properties of the atoms were examined by plotting bond overlap population of electron states. The plot of density of status supported the covalent bonding properties by showing the overlap between the electronic states. There is a strong tendency of covalent bonding between Ti and S. In the presence of Li and Fe, the bond overlap population of Ti-S bonding decreases sharing the covalency with Li-S or Fe-S. The ionic character of the intercalating atom was negligible. The results of the calculation of TiS₂ indicate that DV-Xα method can be widely applied in the research area of electronic structures. It could also be used to develop a new practical material.
인공치관용 CaO ·MgO ·2SiO₂-3CaO ·P₂O-MgO ·TiO₂계 Glass-Ceramic의 결정화에 미치는 TiO₂의 영향(I)
김효성,배태성,진영철,이민호 大韓齒科器材學會 1994 대한치과재료학회지 Vol.21 No.1
Effects of TiO₂additions on the crystallization behavior of a glass with a composition of 50.0wt% CaO·MgO·2SiO₂-40.0wt% 3CaO·??-10wt% MgO·TiO₂system were investigated by ovserving the microstructure of the crystallized products. The results obtained are summarized as follows; 1. The major crystalline phases are indentified by X-ray diffraction as apatite(??), wollastonite(CaSiO₃), whitlockite[β-Ca₃(PO₄)₂], MgTiO₃and diopside[CaMg(SiO₃)₂]. 2. The glass transition temperature(??) and the softening point(??) are shifted to the lower temperature by increasing of TiO₂content. 3. The apatite and MgTiO₃crystallization are increased by increasing of TiO₂content. 4. The exothermic crystallization peak of MgTiO₃appear in the sample which contained more than 15.6wt% of TiO₂.
박종현,우기도,박영구,류재화,진영철 한국열처리공학회 1999 熱處理工學會誌 Vol.12 No.1
Graphitization of cementite in high carbon steels at subcritical temperature is reported. We have studied about the effects of Ni in these steels on graphitization. The chemical compositions of the specimens were Fe-(0.54, 0.7)%-C-1.0%Si-0.1%Mn-(0.2∼1.0)%Ni. After annealing at 650℃, 680℃ and 700℃ during various time the microstructures and hardness change were observed. In order to recover the initial hardness of high carbon steel, dissolution treatment of graphite was performed at 870℃. In case of 0.7%C steel, graphitization was accelerated rather 1.0%Ni addition steel than 0.2% and 0.54%Ni addition steels but the graphite is coarser. In case of 0.54%C-0.2%Ni steel, graphite particles were distributed relatively homogeniously and finely. Nickel addition promotes graphitization of these steels but makes graphite blocky.