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Simplified and Cost-Effective Sintering Processes for Creep Resistant Ni-10wt.% Cr MCFC Anodes
Lee, Dokyol,Jung, Dohwon,Lee, Insung,Byun, Kyungrae,Lim, Heechun 대한금속재료학회 2003 METALS AND MATERIALS International Vol.9 No.6
Two sintering processes were designed for Ni-10wt.%Cr anodes. One included a full oxidation and reduction, referred to as FR hereafter, and the other included a reduction only, referred to as R hereafter. The processes were designed to replace the existing partial oxidation and reduction process, referred to as PR hereafter, which is known to be rather complicated and expensive. The morphologies and creep behaviors of the anodes were also investigated. The anode sintered through a FR process, with an oxidation time of 0.5 hr, showed almost as fine oxide dispersion and high creep resistance as that sintered through a PR process. The creep strain was 3.1 % (porosity 60 %) after a 100 hr creep test, with no micropores observed in the anode. Conversely, the anode sintered through an R process showed a morphology of coarse oxide dispersion with large Cr₂O₃ particles. Accordingly, the creep resistance of the anode was not as high as that of the anode sintered through the PR or FR processes.
Effect of Reinforcing Materials on Properties of Molten Carbonate Fuel Cell Matrices
Moon, Young-Joon,Lee, Dokyol The Korean Ceramic Society 1996 The Korean journal of ceramics Vol.2 No.3
The molten carbonate fuel cell matrices, which are usually made of high surface, fine particle size ${\gamma}-LiAlO_2$ are reinforced with coarse particles of the same material and alumina fibers. An the effects of reinforcing materials on pore characteristics, sintering properties and mechanical properties of the matrices are examined.Among the matrices examined, the highest mechanical reinforcement has been achieved in the one containing 10 wt.% coarse particles and 20 wt.% alumina fibers.
CVD 방법으로 제조된 SnO2/Si 와 SnO2 (: Sb)/Si 이성접합의 전기적 성질
문탁진,최인훈,유세웅,이덕열 대한금속재료학회(대한금속학회) 1988 대한금속·재료학회지 Vol.26 No.4
The semiconducting SnO₂and SnO₂( : Sb) films were deposited on n-type silicon wafer substrates by chemical vapor deposition and the electrical properties of these hetero junctions have been investigated. Dibutyl tin diacetate and antimony pentachloride were used af the source materials respectively for tin and for antimony. The tin oxide films, undoped or antimony-doped, turned out to be n-type semiconductors and their forbidden band gap was estimated as 3.9 eV. The current-voltage characteristics of both SnO₂/Si and SnO₂( Sb)/Si heterojunctions represent good rectification with a threshold voltage of 0.55V. The barrier of the junction with a height of 0.78 eV was found in the Si side as in the case of metal-semiconductor Schottky barrier juntions. The deplection layer width of these junctions was estimated at zero bias as 7320Å. The ideality factor for undoped tin oxide films was 3.1 and reduced to 2.5 for Sb-doped films. The energy band diagram of SnO₂( : Sb)/Si heterojunctions has bean suggested from he results of these electrical pro perties.
중온형 고체산화물 연료전지Bi<sub>x</sub>Ce<sub>l-x</sub>O<sub>2-x/2</sub> 전해질의 제조 및 특성평가
한주형,이인성,이덕열,Han, Ju-Hyeng,Lee, In-Sung,Lee, Dokyol 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.12
[ $Bi_xCe_{l-x}O_{2-x/2}$ ](BD C : Bismuth Doped Ceria) powders with x = 0.1, 0.2, and 0.3 were synthesized using the Glycine Nitrate Process (GNP). They were then calcined at $500^{\circ}C$ for 2 hand sintered in a pellet or rod form at 900, 1000 or $1100^{\circ}C$ for 4 h for characterization as the alternative electrolyte material for intermediate temperature solid oxide fuel cells. The BDC powder consisted of a single phase of $CeO_2-Bi_2O_3$ solid solution in the as-synthesized state as well as in the as-calcined state with a mean powder size of 4.5nm in the former state and 6.5 - 10.1nm in the latter. On the contrary, the second phase of $\alpha-Bi_2O_3$ was observed to have been formed in the sinter with its amount increasing roughly with increasing temperature or $Bi_2O_3$ content. The BOC powder was superior in sinterability to other alternative electrolyte materials such as GDC, ScSZ, and LSGM with the minimum sintering temperature for a relative density of $95\%$ or larger as low as $1100^{\circ}C$. The ionic conductivity of BOC increased with $Bi_2O_3$ content and the maximum value of 0.119 S/cm was obtained at $800^{\circ}C$ for $Bi_{0.3}Ce_{0.7}O_{1.85}$.