http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전이금속을 첨가한 플라즈마 TiO₂ 복합 용사피막의 광전류 특성
고병천(Byung-Chun Ko),고영봉(Young-Bong Ko),박경채(Park Kyeung Chae) 한국표면공학회 2011 한국표면공학회지 Vol.44 No.3
In this study, the photocurrent characteristics of plasma sprayed TiO₂ coatings have been investigated according to additive transition metal (Fe, Mn, Nb powder) and heat treatment conditions. The plasma sprayed TiO₂ coatings by heat treatment at 400℃ and 90 min had the higher photocurrent at ultraviolet light, no photocurrent at visible light. The photocurrent of plasma sprayed TiO₂ coatings added by Fe, Mn, Nb (named by plasma sprayed TiO₂ composite coatings) was lower than that of plasma sprayed TiO₂ coatings at ultraviolet light, as was low in intensity ratio of XRD(101)/(110). and the atomic percentage of oxygen by plasma sprayed TiO₂ composite coatings was higher than that by plasma sprayed TiO₂ coatings. The photocurrent of plasma sprayed TiO₂ composite coatings in heat treatment at 400℃ and 90 min was higher than that of plasma sprayed TiO₂ coatings in same heat treatment conditions at ultraviolet and visible light, as was high in oxygen affinity by heat treatment.
윤태욱(Tae-Wook Yoon),고영봉(Young-Bong Ko),고병천(Byung-Chun Ko),박경채(Kyeung Chae Park) 한국표면공학회 2010 한국표면공학회지 Vol.43 No.5
FTMP(friction thermo-mechanical process) is an adaptation of friction stir welding, and can be used as a generic process to modify the microstructure at selective locations. In this study, in order to analyze characteristics of surface modification of ACA4 castings by FTMP, change of rotating speed(R/S) and traveling speed(T/S) of tool were applied as conditional parameter. Analysis of microstructure, hardness, surface roughness and depth of modified zone(MZ) were searched. The best condition were obtained at R/S 600 rpm and T/S 100 ㎜/min. At this time, hardness was 82 HV, the surface roughness was 0.07 ㎜ and the depth at MZ was 1.72 ㎜. Free defects microstructure and fine Si particles formation and strong forging effects were analyzed at MZ.