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고재황,이동복,Ko J. H,Lee D. B 한국재료학회 2004 한국재료학회지 Vol.14 No.4
The oxide scales formed on Ni-18W(at.%) coating that was electrodeposited on steel were investigated using XRD, SEM and TEM. The oxide scales consisted mainly of an outer NiO layer, and an inner thick ($NiWO_4$+NiO) mixed layer. The unoxidized coating below the oxide scale was rich in Ni and depleted in W, owing to the consumption of Wand the resultant Ni enrichment. The oxidation resistance of Ni-18W coating was poorer than that of the TiN coating, due to the formation of nonprotective NiWO$_4$. During oxidation, Ni and the substrate element of Fe diffused outward, while oxygen inward, according to the concentration gradients.
고재황,이동복,Ko J. H,Lee D. B 한국재료학회 2004 한국재료학회지 Vol.14 No.2
High velocity oxy-fuel sprayed NiCoCrAlY coatings were oxidized between 1000 and $1200^{\circ}C$ in air, and the oxide scales were examined by XRD, SEM/EDS, and EPMA. The unoxidized coatings consisted mainly of ${\gamma}$'$-Ni_3$Al, with some ${\gamma}$-Ni. The major oxide formed on the coatings was $\alpha$ $-Al_2$$O_3$. Additionally, (CoCr$_2$$O_4$, $CoAl_2$$O_4$) spinels and $Al_{5}$ $Y_3$$O_{12}$ coexisted. NiO was not found, despite of high amount of Ni in the coating. Below the oxide layer, internally formed $Al_2$$O_3$ existed.
HVOF 용사된 NiCoCrAlIr 코팅의 산화막 관찰
고재황,이정혁,이동복 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.4
High velocity oxy-fuel sprayed 34Co-32Ni-22Cr-10Al-0.4Ir coatings were oxidized between 1000 and 1200℃ in air, and the oxide scales were investigated by XRD, SEM/EDS, and EPMA. The unoxidized coatings consisted mainly of γ-Ni_(3)Al, with some y-Ni and a meager amount of Cr_(2)O_(3). The major oxide formed on the coatings was α-Al_(2)O_(3). Additionally, spinels of CoCr_(2)O_(4) and CoAl_(2)O_(4) coexisted. Neither Ni- nor Ir-xoides were detected by XRD owing to thermodynamic nobility that resist oxidation or their small amount in the oxide scale. Iridium seemed to deter the formation of sound oxide scales. (Received November 17, 2003)
고재황(J. H. Ko),이동복(D. B. Lee) 한국표면공학회 2004 한국표면공학회지 Vol.37 No.6
Ti₃SiC₂ material was synthesized via the powder metallurgical route, and oxidation tested between 900 and l200℃ in air for up to 100 hr. The oxidation of Ti₃SiC₂ material resulted in the formation of TiO₂ and SiO₂, accompanying the evolution of CO or CO₂ gases from the initial stage of oxidation. The oxidation resistance of Ti₃SiC₂ mainly owes the protectiveness of highly stoichiometric SiO₂. During the initial stage of oxidation, the dominant reaction was the inward transport of oxygen into the matrix. As the oxidation progressed, an outer TiO₂ layer and an inner (TiO₂ + SiO₂) mixed layer formed. Between these layers and inside the oxide scale, numerous fine voids formed. Numerous, fine oxide grains formed at 900℃ developed into the outer coarse TiO₂ grains and an inner fine (TiO₂ + SiO₂) mixed grains at the higher temperatures. The oxidation resistance of Ti₃SiC₂ progressively deteriorated as the oxidation temperature increased, forming thick scales above 1000℃. The outer coarse TiO₂ grains formed above 1100℃ grew rapidly mainly along (211).
김태화,고재황,이동복,Kim T. H.,Ko J. H.,Lee D. B. 한국재료학회 2005 한국재료학회지 Vol.15 No.1
Stainless steel fibers with a diameter of $17\;{\mu}m$ and 630 nm were produced from stainless steel wires by the drawing/annealing/exfolitation process. The suitable sheath material to draw the core stainless steel wires to fibers was the Cu coating. The low melting metal of Zn was not a suitable sheath coating. Also, an attempt was made to produce $20\;{\mu}m{\Phi}Ti$ fibers from the core titanium wires. The main obstacles in producing Ti fibers were their resistance to deformation owing to the Ti's hop structure, and high reactivity of Ti with the exfolitation solution.