http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
알루미늄 PEO 코팅의 결정상에 미치는 공정 조건에 대한 연구 I. Unipolar 펄스와 코팅시간
김배연,함재호,이득용,김용남,전민석,김기윤,최지원,김성엽,김광엽,Kim, Bae-Yeon,Ham, Jae-Ho,Lee, Deuk Yong,Kim, Yong-Nam,Jeon, Min-Seok,Kim, Kiyoon,Choi, Ji-Won,Kim, Sung Youp,Kim, Kwang Youp 한국결정성장학회 2014 韓國結晶成長學會誌 Vol.24 No.2
전해질로 $Na_2SiO_3$을 사용하여 A1050 알루미늄 판재를 pulse 폭 $ 2000{\mu}sec$, impulse 420 V, 400 ${\mu}$sec의 unipolar pulse로 플라즈마 전해 산화 코팅(plasma electrolytic oxidation coating)을 하여 산화 피막을 2, 5, 15, 30분에 따라 형성시킨 다음 산화피막을 분석하였다. 표면에 형성된 산화물의 결정상은 ${\alpha}-alumina$와 ${\gamma}-Alumina$로서 시간에 따른 변화는 없었다. 반응 초반에는 ${\gamma}-Alumina$가 많이 생성되었지만 시간이 갈수록 ${\gamma}-Alumina$의 양에는 변화 없이 ${\alpha}-alumina$가 많이 생겨남을 알 수 있었다. 이런 결과는 micro plasma에 의해서 ${\gamma}-Alumina$가 우선 생성되고, 이후 계속되는 micro plasma의 열에 의해서 ${\alpha}-alumina$로의 전이가 일어나기 때문으로 판단된다. Crystallographic phases of Plasma electrolytic oxidized Al alloy, A1050, were investigated. The electrolyte of PEO was $Na_2Si_2O_3$ and KOH. Unipolar pulse, $ 2000{\mu}sec$ with $400{\mu}sec+420V$ impulse, were applied for 2 min, 5 min, 15 min, and 30 min. ${\gamma}-Alumina$, as well as ${\alpha}-alumina$, was main crystal phase. ${\gamma}-Alumina$ was appeared in the beginning, then the amount of ${\alpha}-alumina$ was increased with time, but the amount of ${\gamma}-Alumina$ remained constant without any increasing. So, it is concluded that plasma gas produce ${\gamma}-Alumina$ at the first, and then ${\gamma}-Alumina$ transform ${\alpha}-alumina$ finally. During the transformation, high temperature of micro plasma gives transformation energy.
플라즈마 전해 산화 코팅에 있어서 알루미늄 합금 모재 성분의 물리적, 결정학적 영향 I. PEO 층의 물성
김배연,이득용,김용남,전민석,송준광,김성엽,김광엽,Kim, Bae-Yeon,Lee, Deuk-Yong,Kim, Yong-Nam,Jeon, Min-Seok,Song, Jun-Kwang,Kim, Sung-Youp,Kim, Kwang-Youp 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.3
Physical properties of Plasma electrolytic oxidized 8 different types of Al alloys, A-1100, A-2024, A-5052, A-6061, A-6063, A-7075, ACD-7B and ACD-12 were investigated. The electrolyte for PEO was $Na_2SiO_3$ solutions with NaOH and some alkali earthen metal salts. Porous layer near the surface of PEO coating was not found, and surface roughness Ra50 was below 2.5 ${\mu}m$. Surface roughness was affected by growth rate of plasma electrolytic oxidized layer, not by Si content in Al alloy.
Mg 합금의 PEO 공정 조건에 따른 산화피막 결정상과 내부식성에 대한 연구 II. 내부식성
김배연,김용남,전민석,함재호,Kim, Bae-Yeon,Kim, Yong-Nam,Jeon, Min-Seok,Ham, Jae-Ho 한국결정성장학회 2018 한국결정성장학회지 Vol.28 No.2
AZ31과 AZ91 Mg 합금을 Na-P 및 Na-Si 전해질을 사용하여 전해질의 농도, 인가전압, 처리시간에 따라 여러가지 조건에서 PEO 처리하여 5%의 농도를 갖는 염수분무법으로 내부식성 연구를 하였다. 일반적으로 산화피막 코팅 두께가 증가하면 내부식성이 증가하였다. 코팅두께보다 산화피막 표면의 기공크기가 커지면 장기 내부식성은 나빠지는 경향을 보인다. 산화피막의 전체적인 산화물 결정상이 증가할수록, 또 MgO 결정상 대신 $Mg_2SiO_4$ 상과 같은 다른 결정상이 증가할수록 내부식성이 월등히 증가하는 것을 알 수 있었다. Mg alloys AZ31 and AZ91 were Plasma-Electrolytic-Oxidized in Na-P and Na-Si system electrolyte at various concentration, applied voltage and time. Thickness and surface roughness of PEO coating were examined. Salt spraying test were carried out to compare their corrosion resistances. Generally, corrosion resistances rate were increased as thickness and crystallinity increasing. Size of pore being larger, long term corrosion resistance decreased. It is turned out that $Mg_2SiO_4$ and other crystalline phase rather than MgO might be increase corrosion resistance dramatically.
알루미늄 PEO 코팅의 결정상에 미치는 공정 조건에 대한 연구 II. Bipolar 펄스와 전해액
김배연,함재호,이득용,김용남,전민석,김기윤,최지원,김성엽,김광엽,Kim, Bae-Yeon,Ham, Jae-Ho,Lee, Deuk Yong,Kim, Yong-Nam,Jeon, Min-Seok,Kim, Kiyoon,Choi, Ji-Won,Kim, Sung Youp,Kim, Kwang Youp 한국결정성장학회 2014 한국결정성장학회지 Vol.24 No.2
A1100, A5052, A6061, A6063, A7075 규격의 시판 알루미늄 합금 판재를 $Na_2SiO_3$와 $Na_2P_2O_7$ 전해질에서 pulse폭 $2000{\mu}sec$, + impulse 420 V, $400{\mu}sec$, -impulse $300{\mu}sec$의 bipolar pulse로 플라즈마 전해 산화 코팅(plasma electrolytic oxidation coating)한 산화피막의 결정상을 분석하였다. 표면에 형성된 산화물의 결정상은 ${\alpha}-alumina$, ${\gamma}-alumina$, ${\eta}-alumina$, $Al_{4.95}Si_{1.05}O_{9.52}$, 그리고 $(Al_{0.9}Cr_{0.1})_2O_3$가 관찰되었다. Bipolar pulse에 의해서 전해액의 성분인 Si가 산화피막에 포함되며, 포함된 Si는 결정상을 형성하기도 하지만 유리상을 형성시킨다. 이때 합금의 Mg 성분은 유리상의 양을 증가시킨다. Micro plasma에 의해서 용융된 표면은 유리상이 먼저 형성되고 이후 계속된 micro plasma의 열에 의하여 새로운 결정상으로 전이가 일어나는 과정을 거치며, 이에 따라 기존에 보고된 결정상이외에도 다양한 결정상이 형성될 수 있음을 추측할 수 있다. Crystallographic phases of Plasma electrolytic oxidized Al alloy, A1100, A5052, A6061, A6063, A7075, were investigated. Two types of electrolyte $Na_2Si_2O_3$ and Na2P2O7 were also compared. Bipolar pulse, $2000{\mu}sec$ with $400{\mu}sec+420V$ impulse and $300{\mu}sec$ - impulse were applied for 20 min. ${\alpha}-alumina$, ${\gamma}-alumina$, ${\eta}-alumina$, $Al_{4.95}Si_{1.05}O_{9.52}$, and $(Al_{0.9}Cr_{0.1})_2O_3$ were mainly observed. Si, component of electrolyte, were moved into the PEO layer by bipolar pulse. Glassy phase was also observed at the surface of $Na_2Si_2O_3$ electrolyte treated PEO layer, and increased with the Mg content of Al alloy. It is concluded that at first glassy phase was formed by the micro plasma, and the high temperature of plasma turns glassy phase to several crystalline phases. And we could expect that many other crystalline phase could be formed by PEO process.
Mg 합금의 PEO 공정 조건에 따른 산화피막 결정상과 내부식성에 대한 연구 I. 결정상
김배연,김용남,전민석,함재호,Kim, Bae-Yeon,Kim, Yong-Nam,Jeon, Min-Seok,Ham, Jae-Ho 한국결정성장학회 2018 한국결정성장학회지 Vol.28 No.2
내부식성이 약해서 응용이 제한되고 있는 Mg 합금 AZ31과 AZ91의 내부식성을 향상시키기 위하여 Na-P 및 Na-Si 전해액을 사용하여 공정조건에 따라 PEO 처리를 하여 표면 피막의 결정상과 morphology를 관찰하였다. PEO 처리한 표면 산화피막에서 가장 흔히 발견되는 결정상은 MgO이며 비정질상의 존재도 알 수 있었다. 전해액에서부터 비롯된 Na, P 및 Si 성분이 산화피막의 형성에 첨가되어 $Na_{3.59}Mg_{2.71}(PO_4)_3$ 상과 $Mg_2SiO_4$ 결정상이 관찰되었다. 산화표면은 PEO 처리 전압, 전해질 농도, 처리 시간에 따라서 기공율이 감소하다가, 이후 기공율과 기공의 크기가 증가하는 경향을 관찰할 수 있었다. To increase corrosion resistance of Mg alloy, AZ31 and AZ91 were PEO treated with different applied voltage and time conditions. We used Na-P and Na-Si system electrolyte. Crystalline phase and morphology were investigated. MgO was Most common crystal phase and vitreous phase could be found. Crystalline phase of $Na_{3.59}Mg_{2.71}(PO_4)_3$ and $Mg_2SiO_4$ also could be found. Porosity of oxidized surface tends to decrease with increasing PEO applied voltage, treat time and concentration of electrolyte, after then, size of pore increased and total number of pore decreased, distinctly.
플라즈마 전해 산화 코팅에 있어서 인산염 전해액과 모재 성분 변화가 Al 산화피막 물성에 미치는 영향 I. PEO층의 물성
김배연,김정곤,이득용,전민석,김용남,김성엽,김광엽,Kim, Bae-Yeon,Kim, Jeong-Gon,Lee, Deuk-Yong,Jeon, Min-Seok,Kim, Yong-Nam,Kim, Sung-Youp,Kim, Kwang-Youp 한국세라믹학회 2012 한국세라믹학회지 Vol.49 No.3
Physical properties of plasma electrolytic oxidized layers of 8 different kinds of Al alloys, A-1100, A-2024, A-5052, A-6061, A-6063, A-7075, ACD-7B and ACD-12 were investigated. The electrolyte for plasma electrolytic oxidation was mixture of distilled water, $Na_2P_2O_7$, KOH and some metal salts. Growth rate of oxide layer was slower in $Na_2P_2O_7$ electrolyte system than in $Na_2SiO_3$ system, and Ra50 surface roughness of oxidized layer was below $1.2{\mu}m$. Surface hardness in $Na_2P_2O_7$ electrolyte system is higher than in $Na_2SiO_3$ system, and roughness was lower in $Na_2P_2O_7$ electrolyte system than in $Na_2SiO_3$ system.
Screen Printable MoSi<sub>2</sub> 도전성 Paste를 이용한 세라믹 면상 발열체 제조
김배연,한동빈,정철원,Kim, Bae-Yeon,Han, Dong-Bin,Jeong, Cheol-Weon 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.4
Screen printable $MoSi_2$ paste and its ceramic sheet heater were investigated. $MoSi_2$ powder without $Mo_5Si_3$ second phase, which causes so-called pest phenomena, was synthesized by SHS technique. Over glaze was also developed for preventing pest phenomenon. The maximum temperature of $MoSi_2$ ceramic heater was over $500^{\circ}C$. After several heat up and cooling cycle, the $MoSi_2$ heater reveals pest phenomenon. Conductive $MoSi_2$ paste could be used in electronic ceramics, i.e., MLCC, LTCC, HTCC, and etc.
Al1050 합금에 Plasma Electrolytic Oxidation으로 형성된 산화피막 분석
김배연,이득용,김용남,전민석,유완식,김광엽,Kim, Bae-Yeon,Lee, Deuk-Yong,Kim, Yong-Nam,Jeon, Min-Seok,You, Whan-Sik,Kim, Kwang-Youp 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.3
The crystal structure of surface coatings on Al1050 alloy by PEO (Plasma Electrolytic Oxidation), were investigated. The electrolyte for PEO was Na-Si-P system solution. The main crystalline phase were $\gamma$-alumina and $\alpha$-alumina. Crystallinity was increased with applied voltage and applied time. The dominant crystalline phase were affected not only chemical composition of Al alloy substrate and electrolyte, but also the +/- ratio of applied voltage.
Characteristics of Piezoelectric Polymeric PVDF Sensor by Impact Testing
Sojeong Kim(김소정),Ji-Yeon Shin(신지연),Yonghyeon Yun(윤용현),Deuk Yong Lee(이득용),Dong-Ho Yang(양동호),Bae-Yeon Kim(김배연),Yo-Seung Song(송요승) 한국고분자학회 2019 폴리머 Vol.43 No.5
근거리 전기방사법을 이용하여 유량속도 139 nL/min, 전기장 세기 12 kV/cm, 콜렉터 속도 500 mm/s로 18 wt% 폴리(비닐리덴 플루오라이드)(PVDF) 섬유를 제조하였다. PVDF 섬유 모듈은 폴리(에틸렌 테레프탈레이트) 필름 위에 위치하였다. 모듈은 0.5 mm 간격으로 섬유 20줄로 구성되어 있다. 압전성과 진동 센서특성은 Al 외팔보를 이용한 충격실험을 통해 조사하였다. PVDF 센서와 lead zirconate titanate(PZT) 센서는 Al 외팔보 양면 끝에서 5 mm 위치에 에폭시를 이용 부착하였다. PVDF 센서의 전압특성은 PZT 센서보다 200배 정도 작았지만 출력 특성파형은 유사하였다. 파장 측정 결과, 두 센서 모두 Al 외팔보의 고유 파장에서 관찰되었다. The 18 wt% poly(vinylidene fluoride) (PVDF) fibers were near-field electrospun at a flow rate of 139 nL/min, an electric field of 12 kV/cm, and a collector speed of 500 mm/s. A PVDF fiber array consisting of 20 fibers was adhered to the flexible PET film. A PVDF and a lead zirconate titanate (PZT) sensors were attached at a distance of 5 mm from the clamped end of the Al cantilever. The vibration sensing capabilities of sensors were examined by measuring the potential generated by the sensors during impact testing. Although the voltage of PVDF sensor was 200 times smaller than that of PZT sensor, the waveforms of the sensor output were similar. Both sensors were determined to be sensitive to variations in the level of dynamic strain due to the inherent piezoelectricity. The spectral results of both sensors exhibited the same signal generated by natural frequency of cantilever.
Effect of Silane Treatment on Mechanical Properties of Polymer-infiltrated Ceramic Dental Materials
Ji-Yeon Shin(신지연),Deuk Yong Lee(이득용),Yo-Seung Song(송요승),Bae-Yeon Kim(김배연) 한국고분자학회 2018 폴리머 Vol.42 No.6
1~20 wt% 실란 처리한 다공성 세라믹 전성형체에 단량체를 침투하고 중합반응을 거쳐 고분자 침투 세라믹(PIC)을 제조하여 실란 농도별 PIC 기계적 물성을 조사하였다. 최적의 경도(99.5 Hv), 강도(271±10 ㎫), 파괴인성(3.74±0.11 ㎫·m<SUP>1/2</SUP>)이 14 wt% 실란 처리한 PIC에서 관찰되었다. 하지만, 실란 농도가 15% 이상이 되면 기계적 물성은 감소하였다. 파괴거동은 실란 농도가 증가함에 따라 입계파괴에서 입내파괴로 변화하였다. 대부분의 균열 에너지는 세라믹 입자를 통과하면서 소진되었다. PIC는 실란 농도에 관계없이 세포 용해 또는 독성을 일으키지 않아 임상적으로 치과용 수복물에 적합하였다. Polymer-infiltrated ceramics (PICs) were prepared by monomer infiltration into porous ceramic preforms and subsequent polymerization by varying the silane concentration in the range of 1 to 20 wt% to investigate the effect of silane concentration on mechanical properties of the PICs. The optimized hardness, the strength and the fracture toughness of 99.5 Hv, 271±10 ㎫ and 3.74±0.11 ㎫·m<SUP>1/2</SUP> were observed for the PICs having a silane concentration of 14%. However, they started to decrease when the silane content was raised more than 15%. The fracture mode was changed from intergranular to transgranular fracture across the ceramic particles with increasing the silane content. Most of the crack energy was dissipated by passing through the ceramic particles rather than through the polymer. The PICs exhibited no evidence of causing cell lysis or toxicity regardless of silane concentration, implying that the PICs are clinically suitable for use as dental restorations.