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Atmospheric plasma spray 공정으로 제조된 Y<sub>2</sub>O<sub>3</sub> 코팅층의 미세조직 및 기계적 특성에 미치는 분사 각도의 영향
황유진,김경욱,이호영,권식철,이기안,Hwang, Yu-Jin,Kim, Kyoung-Wook,Lee, Ho-Young,Kwon, Sik-Chol,Lee, Kee Ahn 한국분말재료학회 (*구 분말야금학회) 2021 한국분말재료학회지 (KPMI) Vol.28 No.4
The effects of different spray angles (90°, 85°, 80°) on the microstructure and mechanical properties of a Y<sub>2</sub>O<sub>3</sub> coating layer prepared using the atmospheric plasma spray (APS) process were studied. The powders employed in this study had a spherical shape and included a cubic Y<sub>2</sub>O<sub>3</sub> phase. The APS coating layer exhibited the same phase as the powders. Thickness values of the coating layers were 90°: 203.7 ± 8.5 ㎛, 85°: 196.4 ± 9.6 ㎛, and 80°: 208.8 ± 10.2 ㎛, and it was confirmed that the effect of the spray angle on the thickness was insignificant. The porosities were measured as 90°: 3.9 ± 0.85%, 85°: 11.4 ± 2.3%, and 80°: 12.7 ± 0.5%, and the surface roughness values were 90°: 5.9 ± 0.3 ㎛, 85°: 8.5 ± 1.1 ㎛, and 80°: 8.5 ± 0.4 ㎛. As the spray angle decreased, the porosity increased, but the surface roughness did not show a significant difference. Vickers hardness measurements revealed values of 90°: 369.2 ± 22.3, 85°: 315.8 ± 31.4, and 80°: 267.1 ± 45.1 HV. It was found that under the condition of a 90° angle with the lowest porosity exhibited the best hardness value. Based on the aforementioned results, an improved method for the APS Y<sub>2</sub>O<sub>3</sub> coating layer was also discussed.
Naphthalene Trisulfonic Acid가 니켈 전착층의 표면 특성에 미치는 영향
이주열(Joo-Yul Lee),김만(Man Kim),권식철(Sik-Chol Kwon),김정환(Jung-Hwan Kim),김인곤(In-gon Kim) 한국표면공학회 2006 한국표면공학회지 Vol.39 No.1
The effects of an organic additive, naphthalene trisulfonic acid (NTSA), contained in the nickel sulfamate bath on the surface properties of the electrodeposited nickel layer were investigated through electrochemical technique, x-ray diffraction analysis, and microscopic observation. The addition of NTSA facilitated the oxidation process of electrodeposited nickel layer during anodic scan and also increased the hardness and internal stress of the nickel film as the applied current density became higher. It seems that NTSA modulated the deposit structure during electrodeposition and so induced higher distribution of (110) orientation with respect to (200). With the increase of the NTSA in the bath, nickel layer was formed in small grain size, which resulted in enhanced surface evenness and brightness.
연속전주공정을 이용한 전자파 차폐용 정밀니켈메쉬 제조 신공정
이주열(Joo-Yul Lee),김만(Man Kim),권식철(Sik-Chol Kwon),Nguyen Viet Hue,김인곤(In-gon Kim) 한국표면공학회 2005 한국표면공학회지 Vol.38 No.6
Novel continuous electroforming process equipped with a rotating patterned mandrel, soluble/insoluble anode and multiple stage of rolling wheels was proposed to produce precision nickel mesh, which is known as a very efficient electromagnetic interference (EMI) shielding material. Continuously electroformed nickel deposits showed a tendency to form small-sized particles as the plating solution temperature increased and mandrel rotation speeded up and the applied current density decreased. Along the honeycomb patterns of mandrel, nickel was accurately electrodeposited on the surface of rotating mandrel, but quite different visual/structural characteristics were measured on both sides.