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액상가압성형 공정을 이용한 SiC 연속섬유 강화 마그네슘 복합재료 개발
조승찬,이동현,이영환,신상민,고성민,김정환,김양도,이상관,이상복 한국복합재료학회 2020 Composites research Vol.33 No.5
In this study, the possibility of manufacturing a magnesium (Mg) composites reinforced with continuous silicon carbide (SiC) fibers was examined using a liquid pressing process. We fabricated uniformly dispersed SiC fiber- AZ91 composites using a liquid phase pressing process. Furthermore, the precipitates were controlled through heat treatment. As a continuous Mg2Si phase was formed at the interface between the SiC fiber and the AZ91 matrix alloy, the interfacial bonding strength was improved. The tensile strength at room temperature of the prepared composite was 479 MPa, showing excellent mechanical properties. 본 연구에서는 액상가압성형 공정을 이용하여 SiC 연속섬유가 강화된 마그네슘 복합재료의 제조 가능성을 검토하였다. 액상가압성형 공정을 이용하여 SiC 섬유가 균일 분산된 AZ91 복합재료를 제조하였으며 열처리를통하여 석출상을 제어하였다. SiC 섬유와 기지합금의 계면에 연속적인 Mg2Si상이 형성되면서 계면 결합력이 향상되었고, 제조된 복합재료의 상온 인장강도는 479 MPa로 우수한 기계적 특성을 나타내었다.
지하공간이용 활성화를 위한 법적 지원방안 : 관련 건축법령을 중심으로
조승찬,신만중 사단법인 한국건설법무학회 2023 건설법무 Vol.9 No.-
The utilization of underground spaces as residential, commercial, and industrial land has a high potential due to their physical availability in urban areas facing a shortage of space, as well as their economic and efficient advantages. The demand for these spaces is anticipated to rise as the need for multi-functional facilities and residential and office spaces continues to grow. Furthermore, the recent prolonged conflict in Ukraine and the devastating loss of life in Seoul resulting from a severe rainfall event in 88 years have accentuated the social imperative to utilize underground spaces for evacuation and disaster preparedness purposes. There is now a pressing requirement for underground spaces that are equipped with features such as evacuation and disaster prevention areas, residential environments conducive to daily life and work, fire safety measures, and evacuation facilities, to provide a safe and comfortable living and working environment. This study identified the key issues related to evacuation spaces, disaster preparedness facilities, multi-functional facilities, residences, and workspaces, and proposes solutions through the examination of building laws and institutional arrangements at the legal level. The aim of this thesis is to provide suggestions to enhance the utilization of underground spaces and create a desirable underground environment.
산소 플라즈마를 이용하여 원거리 플라즈마 원자층 증착법으로 형성된 하프늄 옥사이드 게이트 절연막의 특성 연구
조승찬,전형탁,김양도,Cho, Seung-Chan,Jeon, Hyeong-Tag,Kim, Yang-Do 한국재료학회 2007 한국재료학회지 Vol.17 No.5
Hafnium oxide $(HfO_2)$ films were deposited on Si(100) substrates by remote plasma-enhanced atomic layer deposition (PEALD) method at $250^{\circ}C$ using TEMAH [tetrakis(ethylmethylamino)hafnium] and $O_2$ plasma. $(HfO_2)$ films showed a relatively low carbon contamination of about 3 at %. As-deposited and annealed $(HfO_2)$ films showed amorphous and randomly oriented polycrystalline structure. respectively. The interfacial layer of $(HfO_2)$ films deposited using remote PEALD was Hf silicate and its thickness increased with increasing annealing temperature. The hysteresis of $(HfO_2)$ films became lower and the flat band voltages shifted towards the positive direction after annealing. Post-annealing process significantly changed the physical, chemical, and electrical properties of $(HfO_2)$ films. $(HfO_2)$ films deposited by remote PEALD using TEMAH and $O_2$ plasma showed generally improved film qualities compare to those of the films deposited by conventional ALD.
습식 교반 및 방전 플라즈마 소결 공정에 의한 CNT 분산 Cu 복합재료 제조
조승찬,조일국,이상복,이상관,최문희,박재홍,권한상,김양도,Cho, Seungchan,Jo, Ilguk,Lee, Sang-Bok,Lee, Sang-Kwan,Choi, Moonhee,Park, Jehong,Kwon, Hansang,Kim, Yangdo 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.2
Multi-walled carbon nanotube (MWCNT)-copper (Cu) composites are successfully fabricated by a combination of a binder-free wet mixing and spark plasma sintering (SPS) process. The SPS is performed under various conditions to investigate optimized processing conditions for minimizing the structural defects of CNTs and densifying the MWCNT-Cu composites. The electrical conductivities of MWCNT-Cu composites are slightly increased for compositions containing up to 1 vol.% CNT and remain above the value for sintered Cu up to 2 vol.% CNT. Uniformly dispersed CNTs in the Cu matrix with clean interfaces between the treated MWCNT and Cu leading to effective electrical transfer from the treated MWCNT to the Cu is believed to be the origin of the improved electrical conductivity of the treated MWCNT-Cu composites. The results indicate the possibility of exploiting CNTs as a contributing reinforcement phase for improving the electrical conductivity and mechanical properties in the Cu matrix composites.
용융가압함침 공정으로 제조된 고체적률 TiC–Inconel 718 금속복합재료의 미세조직 및 특성
조승찬,이영환,고성민,박현재,이동현,신상민,조일국,이상복,이상관 한국복합재료학회 2019 Composites research Vol.32 No.3
Titanium carbide (TiC) reinforced Inconel718 matrix composites were successfully fabricated by a novel liquid pressing infiltration process. Microstructure and mechanical properties of the fabricated 55 vol% TiC–Inconel718 composite are analyzed. The composite exhibits superior mechanical properties, such as hardness and compressive strength as compared with Inconel718. It is believed that Mo and Nb, which are alloying elements in the matrix, diffuse and solidify into the TiC reinforcement, resulting in generation of core-rim structure with excellent interfacial properties. 본 연구에서는 용융가압함침 공정을 이용하여 고체적률의 TiC 입자가 균일 분산된 Inconel718 금속복합재료를 제조하고, 미세조직 및 기계적 특성을 분석하였다. 약 55 vol%의 TiC가 균일하게 분산된 TiC/Inconel718 복합재료를 제조함으로써 Inconel718 대비 우수한 경도 및 압축강도 특성을 나타내었으며, 이는 기지에 고용된 합금원소인 Mo 및 Nb이 TiC 강화재 내부로 확산·고용되어 우수한 계면 특성을 가지는 core-rim 구조의 TiC 형성에 의한 것으로 판단된다.
원거리 플라즈마 ALD법으로 증착한 ZrN박막의 특성 연구
조승찬,황윤철,이근우,한세진,김인배,전형탁,김양도,Cho Seung Chan,Hwang Yoon Cheol,Lee Keun Woo,Han Se Jin,Kim In Bae,Jeon Hyeongtag,Kim Yangdo 한국재료학회 2005 한국재료학회지 Vol.15 No.9
The barrier characteristics of ZrN films deposited by remote plasma enhanced atomic layer deposition(PEALD) using TDEAZ and $N_2$ remote plasma have been investigated under various deposition conditions such as temperatures, plasma power and processing pressures. ZrN films showed generally improved properties as the processing temperature, pressure and plasma power increased. The optimized processing temperature, plasma power and pressure were $300^{\circ}C$, 200 Watt and 1 torr. respectively ZrN films deposited at the optimized processing conditions showed the carbon contents and resistivity of $6at.\%$ and $400{\mu}{\Omega}cm$ respectively.
용융가압함침공정을 이용한 세라믹 입자 강화 철강복합재료의 제조성 검증
조승찬 ( Seungchan Cho ),이영환 ( Yeong-hwan Lee ),고성민 ( Seongmin Ko ),박현재 ( Hyeon Jae Park ),이동현 ( Donghyun Lee ),신상민 ( Sangmin Shin ),조일국 ( Ilguk Jo ),이상관 ( Sang-kwan Lee ),이상복 ( Sang-bok Lee ) 한국복합재료학회 2018 Composites research Vol.31 No.4
본 연구에서는 용융가압함침 공정을 이용하여 TiC, TiB<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> 세라믹 입자가 분산된 SUS431 금속복합재료를 제조하고 미세조직을 분석하여 세라믹 입자에 따른 제조성에 대해 검토하였다. 젖음성이 나쁜 Al<sub>2</sub>O<sub>3</sub>의 경우 내부에 결함이 다수 존재함을 알 수 있었으며, TiB<sub>2</sub> 및 TiC 입자 강화 복합재의 경우 상대적으로 결함이 적고 강화재가 균일 분산되었음을 확인하였다. 특히, TiC-SUS431 복합재료의 경우 TiC와 Fe계 기지합금의 우수한 젖음성 및 용융가압함침공정 적용으로 우수한 계면 특성을 가지며 결함이 적고 균일한 미세조직을 가지는 것을 확인하였다. Various ceramic particulate such as TiC, TiB<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> reinforced SUS431 matrix composites were successfully fabricated by a novel liquid pressing infiltration process. Microstructures of the SUS431 composite were analyzed to determine manufacturability of composites. Al<sub>2</sub>O<sub>3</sub>-SUS431 composite had lots of defects due to poor wettability between the Al<sub>2</sub>O<sub>3</sub> and steel matrix. On the other hand, TiC was uniformly dispersed in the SUS431 matrix than TiB2 and Al<sub>2</sub>O<sub>3</sub> due to good wettability and interfacial properties.