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김동욱,차필령,Kim, Dong-Uk,Cha, Pil-Ryung 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.2
We investigate grain growth behavior of poly-crystalline Mg sheet having strong basal fiber texture using phase field model for grain growth and micro-elasticity. Strong initial basal texture was maintained when external load was not imposed, but was weaken when external biaxial strain was imposed. Elastic interaction between elastic anisotropy of Mg grain and external load is the reason why texture evolution occurs.
김동욱,변지영,차필령,Kim, Dong-Uk,Byun, Ji-Young,Cha, Pil-Ryung 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.2
We developed a 3D simulation model of microstructure evolution of vertically aligned porous structure due to phase separation during film growth. The model proves its validity by reproducing the results of previous researches which are topological features of the microstructures and effects of varied processing parameters. The model will be extended by including bulk diffusion effect and elastic effect.
수직-수평온도구배법에 의한 200 mm급 사파이어 단결정 성장의 전산모사 연구
김형중 ( Hyung Joong Kim ),차필령 ( Pil Ryung Cha ),김성균 ( Seong Gyoon Kim ),문성환 ( Sung Hwan Moon ),장계원 ( Gye Won Jang ),나복기 ( Bok Kee Na ),김준환 ( Jun Hwan Kim ),김동욱 ( Dong Uk Kim ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.1
A sapphire single crystal growth process by the Vertical-Horizontal Gradient Freezing (VHGF) method was studied by a numerical analysis technique. The heater power was controlled in order to follow the given arbitrary target heater temperature profile through the whole series of the process. Due to the influence of radiation heat transfer, the heater had spatial temperature deviation in spite of the fact that the heater power was imposed uniformly through its whole body. As a structural feature of the VHGF method, temperature at the lower part of crucible was lower than that at the upper part of crucible because it was cooler at the bottom of the furnace. Thus, the movement of the solid/liquid interface was driven in the bottom-to-top direction. (Received February 4, 2014)
저항가열 초크랄스키법에 의한 야그 단결정 성장의 전산모사 연구
유명현 ( Myeong Hyeon You ),차필령 ( Pil Ryung Cha ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.1
Yttrium Aluminum Garnet (YAG) single crystal has received much attention as the high power solid-state laser`s key component in industrial and medical applications. Various growth methods have been proposed, and currently the induction-heating Czochralski (IHCZ) growth method is mainly used to grow YAG single crystal. Due to the intrinsic properties of the IHCZ method, however, the solid/liquid interface has a downward convex shape and a sharp tip at the center, which causes a core defect and reduces productivity. To produce YAG single crystals with both excellent quality and higher yield, it is essential to control the core defects. In this study, using computer simulations we demonstrate that the resistance-heating CZ (RHCZ) method may avoid a downward convex interface and produce core defect free YAG single crystal. We studied the effects of various design parameters on the interface shape and found that there was an optimum combination of design parameter and operating conditions that produced a flat solid-liquid interface. (Received April 22, 2016; Accepted June 29, 2016)
플라즈마 화학기상증착법을 이용한다층 그래핀의 저온합성과 성장 메커니즘
윤가영 ( Kayoung Yun ),정다솔 ( Dasol Cheang ),현지연 ( Jiyeon Hyun ),노애란 ( Aeran Roh ),허선 ( Sun Heo ),( Lanxia Cheng ),( Jiyong Kim ),차필령 ( Pil Ryung Cha ),이재갑 ( Jagab Lee ),남호석 ( Ho Seok Nam ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.11
Multi-layer graphene is considered to be a potential replacement of copper wiring for LSI (large-scale integration). PECVD (plasma enhanced chemical vapor deposition) is one of the most reliable synthesis techniques to manufacture high-quality, large-scale graphene at low temperature. Compared with thermal CVD graphene, the relatively lower quality of PECVD graphene is its main drawback. In order to suggest a solution for this problem, we studied the growth mechanism of multi-layer graphene deposited onto nickel by PECVD at 400 ℃. We found that both segregation and solution-precipitation models affect the growth behavior of multi-layer graphene. To support this, we analyzed the influences of Ni-film thickness, cooling rate, and plasma energy on multi-layer graphene growth. The results from this study would be useful for optimizing graphene growth conditions for many applications.
Cu 필라 솔더 범프의 리플로우 전후 형상변화 및 모델링
김상혁 ( Sang Hyuk Kim ),신한균 ( Han Kyun Shin ),박채민 ( Chae Min Park ),김동욱 ( Dong Uk Kim ),차필령 ( Pil Ryung Cha ),이의형 ( Ui Hyoung Lee ),이효종 ( Hyo Jong Lee ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.7
A Cu pillar bump was fabricated by consecutive plating of Cu and Sn. Here, we investigated the change in shape of Sn, and the formation of intermetallic compound during the reflow process. At first, we made a cylindrical shape of Sn in various thickness and then, the Sn was changed into a truncated sphere (Sn bump) on a Cu pillar through the reflow process. When the Sn thickness was a third of the Cu pillar diameter, the reflowed bump radius had a minimum value and the bump-height change at that time had a maximum value. Such results were well understood based on the truncated sphere model.