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티타니아 세라믹 熔射皮膜의 機械的 特性에 미치는 熔射條件의 影響에 관한 硏究
김영식,김영식,Kim, Yeong-Sik,Kim, Yeong-Sik 한국마린엔지니어링학회 1991 한국마린엔지니어링학회지 Vol.15 No.3
The purpose of this investigation is to examine the effects of spraying conditions on the mechanical properties of flame-sprayed titania ceramic coating layer. Titania ceramic was sprayed onto the mild steel substrate under the various spraying conditions. Spraying distances were 100, 150, 200, 250mm respectively and pinch air pressures were 0.2 0.3, 0.4 MPa at each spraying distance. The mechanical properties such as microhardness, adhesive strength and erosion wear resistance were tested for the specimens sprayed under the various spraying conditions above mentioned. The optimum operational conditions obtained through the experimental results were 150mm of spraying distance and 0.3 MPa of pinch air pressure.
고탄소강의 연속 건식 신선 공정에서 선재의 온도 예측 기법 개발
김영식,김동환,김병민,김민안,박용민,Kim, Yeong-Sik,Kim, Dong-Hwan,Kim, Byeong-Min,Kim, Min-An,Park, Yong-Min 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.2
Wire drawing process of the high carbon steel with a high speed is usually conducted at room temperature using a number of passes or reductions through consequently located dies. In multi-stage drawing process, temperature rise in each pass affects the mechanical properties of final product such as bend, twist and tensile strength. Also, this temperature rise during the deformation is the reason that the wire in drawing process is broken by the embrittlement due to rapid strain aging effect. This paper presents the estimation of the wire temperature for the multi-stage wire drawing process. Using the proposed calculation method of wire temperature, temperature rise at deformation zone as well as temperature drop in block considering the heat transfer between the block and wire were calculated. As these calculated wire temperatures were applied to the real industrial fields, it was known that the calculated results were in a good agreement with the measured wire temperature.
김영식,Kim, Yeong-Sik 한국과학기술단체총연합회 1995 과학과 기술 Vol.28 No.9
지난 7월25일 오후7시경 서해 백령도 부근에서 규모4.0의 지진이 발생했다. 비록 50초간의 별 피해없는 약진이었지만 백령도에서는 물론 서울을 비롯한 경기 서부북 일대에서도 건물 유리창이 흔들릴 정도의 수준이었다. 이에따라 한반도 지진발생현황을 살펴보고 우리 원전의 안전성을 점검해본다