압전 액튜에이터의 특성 및 기술동향

엄우식,송준광,이해욱 ( Woo Sik Um,Jun Kwang Song,Hae Wook Lee ) 한국전기전자재료학회 1997 전기전자재료학회논문지 Vol.10 No.7

Thermal Decomposition Behavior and Durability Evaluation of Thermotropic Liquid Crystalline Polymers

신상미,송준광,김성훈 한국고분자학회 2009 Macromolecular Research Vol.17 No.3

The thermal decomposition behavior and degradation characteristics of four different thermotropic liquid crystalline polymers (TLCPs) were studied. The thermal decomposition behavior was determined by means of thermogravimetric analysis (TGA) at different heating rates in nitrogen and air. The order of the thermal stability was as follows: multi-aromatic polyester > hydroxybenzoic acid (HBA)/hydroxynaphthoic acid (HNA) copolyester > HNA/hydroxyl acetaniline (HAA)/terephthalic acid (TA) copolyester > HBA/Poly(ethylene terephthalate) (PET) copolyester. The activation energies of the thermal degradation were calculated by four multiple heating rate methods:Flynn-Wall, Friedman, Kissinger, and Kim-Park. The Flynn-Wall and Kim-Park methods were the most suitable methods to calculate the activation energy. Samples were exposed to an accelerated degradation test (ADT), under fixed conditions of heat (63±3 ℃), humidity (30±4%) and Xenon arc radiation (1.10 W/m2), and the changes in surface morphology and color difference with time were determined. The TLCPs decomposed, discolored and cracked upon exposure to ultraviolet radiation.

인체감지 모듈을 적용한 에너지 절감형 조명기구

이해욱,송준광,함중걸 한국조명전기설비학회 2001 조명.전기설비 Vol.15 No.5

분말 충전 성형법을 이용한 SiC-Al Alloy 복합체의 제조

박정현,송준광,백승수,염강섭,강민수 한국세라믹학회 1997 한국세라믹학회지 Vol.34 No.4

To fabricate the ceramic/metal(SiC/ Al alloy) composite, SiC preform was prepared by Pressureless Powder Packing Forming Method and 6061 Al alloy was infiltrated into the preform. Uniform compact having an average pore size of 10 ${\mu}{\textrm}{m}$ and narrow pore size distribution was prepared. Phenolic resin solution(40 wt%) was penetrated into the SiC compact, and then the compact was preheated at the temperature of 120$0^{\circ}C$. The pore size distribution and the microstructure of the preform were not changed by preheating. An uniform microstructure without any crack in the preform was obtained in SiC-Al alloy composite. The infiltration of 6061. Al alloy into the preform began at the temperature of 130$0^{\circ}C$ and the amount of infiltration increased in proportion to the infiltration temperature and the soaking time. The increasement rate of the infiltration amount decreased after 3 h. As a result of the infiltration at 140$0^{\circ}C$ for 4 h, Al alloy was well distributed in the interparticle channels and the relative density of the composite was above 98%. The strength and the fracture toughness of the composite were 303 MPa and 21.65 MPam1/2, respectively.

압전 액튜에이터의 특성 및 기술동향

엄우식,송준광,이해욱 한국전기전자재료학회 1997 電氣電子材料學會誌 Vol.10 No.7

졸-겔법으로 제조한 Al-doped ZnO 박막의 특성에 관한 연구

김용남,이승수,송준광,노태민,김정우,이희수,Kim, Yong-Nam,Lee, Seoung-Soo,Song, Jun-Kwang,Noh, Tai-Min,Kim, Jung-Woo,Lee, Hee-Soo 한국결정성장학회 2008 韓國結晶成長學會誌 Vol.18 No.1

졸-겔 공정을 이용하여 유리기판 위에 Al-doped ZnO(AZO) 박막을 제조하였고, AZO 박막의 특성에 대하여 Al 전구체 종류 및 post-annealing 온도가 미치는 영향에 대하여 고찰하였다. AZO 박막 제조용 졸은 zinc acetate, EtOH, MEA 등을 사용하여 제조하였고, Al doping 을 위한 전구체로는 aluminum nitrate 와 aluminum chloride 를 사용하였다. Sol 내의 Zn 농도는 0.5 mol/l 로 하였고, Al doping 양은 Zn 대비 1 at%로 고정하였다. 유리기판 위에 졸을 spin-coating 한 후 $550^{\circ}C$에서 2 시간 동안 열처리한 후, $N_2$와 $H_2$의 비가 9 : 1인 환원 분위기 내에서 $300^{\circ}C,\;400^{\circ}C,\;500^{\circ}C$인 온도에서 2시간 동안 post-annealing을 진행하였다. 제조된 AZO 박막의 구조적, 전기적, 광학적 특성은 XRD, FE-SEM, AFM, Hall effect measurement system 및 UV-Visible spectroscopy를 이용하여 분석하였다. Al 전구체로서 aluminum nitrate 를 사용한 경우가 aluminum chloride 를 사용하여 제조한 AZO 박막보다 우수한 광학적, 전기적 특성을 나타내었으며, post-annealing 온도가 증가함에 따라 비저항과 투과율은 감소하였다. $500^{\circ}C$에서 post-annealing한 AZO 박막의 전기비저항 값은 $2{\times}10^{-3}{\Omega}{\cdot}cm$이었고, 투과율은 $300^{\circ}C$에서 91%로 가장 높게 나타났다. AI-doped ZnO(AZO) thin films have been fabricated on glass substrate by sol-gel method, and the effect of Al precursors and post-annealing temperature on the characteristics of AZO thin films was investigated. The sol was prepared with zinc acetate, EtOH, MEA and Al precursors. In order to dope Al in ZnO, two types of aluminum nitrate and aluminum chloride were used as Al precursor. Zinc concentration was 0.5 mol/l and the content of Al precursor was 1 at% of Zn in the sol. The sol was spin-coated on glass substrate, and the coated films were annealed at 550ue for 2 hand were post-annealed at temperature ranges of $300{\sim}500^{\circ}C$ for 2 h in reducing atmosphere ($N_2/H_2$= 9/1). Structural, electrical and optical propertis of the fabricated AZO thin films were analyzed by XRD, FE-SEM, AFM, hall effect measurement system and UV-visible spectroscopy. Optical and electrical properties of AZO thin films prepared with aluminum nitrate as Al precursor were better than those of films prepared with aluminum chloride. The electrical resistivity and the optical transmittance of films decreased with increasing post-annealing temperatures. The minimum electrical resistivity of $2{\times}10^{-3}$ and the maximum optical transmittance of 91% were obtained for the AZO thin films post-annealed at $550^{\circ}C\;and\;300^{\circ}C$, respectively.

자전연소합성법으로 제조된 SiO₂ 첨가된 MoSi₂ 분말 내에서의 SiO₂의 거동 연구

나사균,전민석,송준광,한동빈,정철원,김성수,이연승,Rha, Sa-Kyun,Jeon, Min-Seok,Song, Jun-Kwang,Han, Dong-Bin,Jeong, Cheol-Weon,Kim, Sung-Soo,Lee, Youn-Seoung 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.6

In order to investigate the behavior of $SiO_2$ in the molybdenum silicide powders, crystal structure of these powders was measured by XRD, in addition, surface composition and surface phase (or chemical states) and microstructure were analysed by XPS and TEM, respectively. Mo-silicide powders containing $SiO_2$ were synthesized by SHS (Self-Propagating High-Temperature Synthesis) technique. In XRD result, according to increase of $SiO_2$ contents, the crystal structure for synthesized $MoSi_2$ powders was still typical $MoSi_2$ bct without any other phases. By XPS analysis, the surface of Mo and Si source powders was covered with $MoO_3$ and $SiO_2$, respectively, and the surface of synthesized $MoSi_2$ powder was also covered with $MoO_3$ and $SiO_2$, which were stable oxides at room temperature. However, according to increase of $SiO_2$ addition, $MoSi_2$ phase in XPS spectra decreased and $SiO_2$ phase increased relatively in synthesized $MoSi_2$ powders. From the results by XPS and XRD, we found that the existent $SiO_2$ has amorphous structure. In the microstructure, the small particulates of the synthesized products added $SiO_2$ agglomerated together to form larger clusters (from ~10 nm to ~1 ${\mu}m$). From TEM, XPS, and XRD results, we found that the out layer of agglomeration of synthesized $MoSi_2$ powder is surrounded by amorphous $SiO_2$.

층상구조 세라믹스의 내구성 및 수명예측 기술 개발

이희수 ( Hee Soo Lee ),송준광 ( Jun Kwang Song ),신현규 ( Hyun Gyu Shin ),신민철 ( Min Chul Shin ),전민석 ( Min Seok Jeon ) 대한금속재료학회 ( 구 대한금속학회 ) 2004 재료마당 Vol.17 No.5

본 연구실에서는 코팅세라믹스의 내구성 및 신뢰성 평가 기술 개발을 목표로 연구를 수행하고 있다. 이를 위해 코팅세라믹스의 기초 특성 평가. 내구성 평가기술 확립, 고장 기구 분석 및 수명 예측 기술 개발을 추진하고 있다. 현재까지 전도성코팅재료인 ITO/glass에 관해 열부하 가속수명시험을 통한 고장분석 및 수명예측이 수행되었고 세라믹 필터 및 치과재료의 기초 특성 및 내구성 평가 기술 개발이 진행되고 있으며 또한 코팅세라믹스의 접착력 평가를 위한 규격안을 제시하였다. 새로운 대체 소재로서의 코팅세라믹스 응용 확대와 성능, 내구성 및 수명에 대한 데이터 축적 및 최적의 평가기술이 요구되는 현 시점에서 수명 예측 기술은 코팅세라믹스의 상용화를 위한 신뢰성 확보에 열쇠를 제공할 것으로 판단된다. 따라서 본 연구실은 코팅세라믹스의 기초특성 확립 및 내구성 수명예측 기술 개발을 통하여, 첫째 국내 관련업체간에 정보를 공유할 수 있는 네트워크 구성, 둘째 선진외국 기관과의 유기적 기술교류 및 협력강화를 통한 국제 표준화, 셋째 기업 중심의 산·학·연 워킹그룹을 구성·운영하여 핵심 기반기술을 다수의 관련 기업 및 유관기관에 전파, 넷째 코팅세라믹스 평가기술 규격화를 통해 내구성 및 수명예측 기술 확보를 통한 국제 경쟁력 확보에 기여할 것으로 예상된다.

Corrosion behavior of carbon steel in the CO2 absorption process using AMP solutions

차진선,홍성은,신민철,송준광 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0

CO2 capture in postcombustion is currently the most advanced technology and has been applied to existing plants. In the case of diluted and low-pressure streams, absorption process using aqueous amine-based solutions is the most attractive technology. However, one of the disadvantages of this process was corrosion problems that seemed to occur in regenerators, reboiler and rich-lean heat exchangers. This study provides the effect of process parameter on the corrosion behavior of carbon steel in CO2 absorption system using AMP solutions. Corrosion was experimentally evaluated using electrochemical techniques. The test parameters were concentration of the AMP solution, solution temperature, CO2 loading and oxygen contents. The experimental results showed that the corrosion behavior was considerably sensitive to the parameters. Increased AMP concentration, AMP solution temperature, CO2 loading and oxygen content accelerated the corrosion rate. In addition, effect of corrosion inhibitor was investigated under same conditions.

CCS 핵심물질 성능평가 가이드라인 개발

전미진,전혜원,김광구,차진신,송준광 대한환경공학회 2015 대한환경공학회 학술발표논문집 Vol.2015 No.10