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송요승(Yo Seung Song),권현옥(Hyun Ok Kwan),조남인(Nam In Jho) Korean Society for Precision Engineering 2012 한국정밀공학회지 Vol.29 No.11
The organic linings at flue gas desulfurization systems (FGD system) in power plant have the excellent chemical properties but, lose the anticorrosive properties according to the aging with environment conditions. The properties of the organic linings depend on the manufacturing company. Therefore, the basic properties of organic linings for the preestimate of life time should be examined by conducting the aging and the bond strength test according to temperature. The pre-aging samples were compared with the post-aging samples. The temperature conditions of the aging process were 70, 150 and 200 ℃. The bond strength was calculated and the cross sections of fracture surface were examined by optical microscope and SEM. The T<sub>g</sub> was examined by DSC, DTA and TGA.
윤우생,송요승,변응선,이구현,노병호,Yun, U-Saeng,Song, Yo-Seung,Byeon, Eung-Seon,Lee, Gu-Hyeon,No, Byeong-Ho 한국기계연구원 1995 硏究論文集 Vol.25 No.-
Plasma 용사 코팅 기술은 전자산업과 정보산업의 기초인 Micro 반도체 산업의 기능성 목적으로 응용되고 있으며, 항공기 등의 첨단산업에서 디젤엔진이나 가스터빈 등 응용 범위를 점차 확대하고 있는 실정이다. 또한 첨단요소 부품에 적용하여 내마모성, 내열성, 내피로성, 내부식성 등을 부여하고 있다. 기능성 부품에 후처리하여 제품의 부가가치를 향상시킬 수 있어, Plasma 용사 코팅기술의 중요성은 날로 증대되고 있는 실정이다. 본 연구에서는 Plasma 용사 기술을 이용하여 코팅을 형성 내마모시험을 통해 국내 첨단요소 부품에 기능성 부여과 낙후된 용사 기술을 향상시키는 데 있다. Plasma spray coating technology is essential for the microsemiconductor processes based on the electronic and computer industry, and extend gradually the range of application for up-to-date industry such as diesel engine and gas turbine components. These thechonoogies may be applied to the components requiring wear-resistance, heat resistance, fatigue-resistance, and corrosion-resistance. In this research, plasma spray technology was selected for the wear resistant coatings as the most proper technique. The final goal of this study is to improve the wear resistance through establishment of coating soft-ware, and basic research for industrialization of the technology concerned.
BCl<sub>3</sub>-H<sub>2</sub>-Ar 분위기를 이용한 2단계 플라즈마 보로나이징 특성
남기석,이구현,신평우,송요승,김배연,이득용,Nam, Kee-Seok,Lee, Gu-Hyun,Shin, Pyung-Woo,Song, Yo-Seung,Kim, Bae-Yeon,Lee, Deuk-Yong 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.6
A two-step plasma-assisted boronizing process was carried out on the AISI 1045 steel substrate to reduce the pore density introduced by a conventional single plasma boronizing process. The specimens were plasma boronized for 1 h at $650^{\circ}C$ and subsequently far 7 h at $800^{\circ}C$ in an atmosphere of $BCl_3-H_2-Ar$. The boride layer thickness was parabolic in boronizing time, a high HV reading of 1540 was found up to the boride layer thickness of $25{\mu}m$. It was found that the morphology of the boride layer prepared by the two-step boronizing process was changed from a columnar to a tooth-like structure and the pores in the borided steel were eliminated completely in comparison to those synthesized by the conventional single boronizing process, implying that it is highly applicable for enhancing the dense and compact coating properties of the low-alloy steel.
은이 피복된 단심 Bi(2223) 초전도 선재에 대한 SrZrO<sub>3</sub> 코팅층의 접착강도 특성
이세종,예경환,이득용,송요승,Lee, Se-Jong,Ye, Kyung-Hwan,Lee, Deuk-Yong,Song, Yo-Seung 한국세라믹학회 2002 한국세라믹학회지 Vol.39 No.10
은이 피복된 Bi(2223) 단심 초전도 선재에 절연층으로 $SrZrO_3$ 피막을 졸-겔과 딥-코팅법으로 제조하여 $SrZrO_3$ 코팅층과 초전도 선재간 접착력 특성을 조사하였다. 실험인자로는 출발원료의 몰비, 유기화합물 첨가량, 건조온도 및 시간, 열처리 온도 및 시간이었으며 다구찌법의 망대특성과 $L_18(2^1{\times}3^7)$ 직교배열표를 이용하여 코팅층의 최적조건인 인자와 수준 조합의 최적화를 접착강도를 측정하여 분석하였다. 최적의 접착 특성을 가진 코팅조건은 Sr/Zr의 몰비가 0.3/0.7, 유기화합물 첨가량이 5wt%, 건조온도 및 시간은 160${\circ}C$ 10분, 열처리 온도 및 시간은 500${\circ}C$ 20분이었다. 분산분석 결과, 유의수준이 ${\alpha}$=0.1인 통계적으로 90% 신뢰공정이었다. Bond strength of $SrZrO_3$ resistive oxide barrier on Ag sheathed Bi(2223) tapes prepared by the sol-gel and dip-coating method was evaluated with an aid of Taguchi method and $L_18(2^1{\times}3^7)$ orthogonal arrays to determine the optimal process combination of levels of factors that best satisfy the bigger is better quality characteristic. The observed optimal condition is as follows: Sr/Zr mol ratio(0.3/0.7), amount of organic vehicle(5 wt%), drying temperature and time(160${\circ}C$, 10 min), heat treatment temperature and time(500${\circ}C$, 20 min), respectively. ANOVA analysis suggested that the influence of the factors within ${\alpha}$=0.1 was significant with a 90% confidence level.
알루미나 입도가 (Y,Nb)-TZP/${Al_2}{O_3}$ 복합체의 R-curve 거동에 미치는 영향
이득용,김대준,김배연,송요승,Lee, Deuk-Yong,Kim, Dae-Joon,Kim, Bae-Yeon,Song, Yo-Seung 한국세라믹학회 2001 한국세라믹학회지 Vol.38 No.10
5.31 mol% ${Y_2}{O_3}$-4.45 mo1% ${Nb_2}{O_5}$-90.31 mo1% $ZrO_2$에 ${Al_2}{O_3}$를 첨가한 복합체를 제조하여 알루미나 입도가 복합체의 균열 전파 저항성에 미치는 영향을 조사하였다. $ZrO_2/{Al_2}{O_3}$ 복합체에서는 R-cuve 거동이 관찰되었으며 0.2, $2.8{\mu}m$ ${Al_2}{O_3}$가 20 vol%가 첨가된 복합체의 인성값은 각각 7.9, $8.8MPam^{1/2}$이었다. 파괴인성값의 차이는 ${Al_2}{O_3}$ 입도 크기에 의존하는 $ZrO_2/{Al_2}{O_3}$ 복합체 내의 정방정 $ZrO_2$의 결정립 크기 차이에 의한 것으로 추정된다. The influence of the ${Al_2}{O_3}$ particle size on flaw tolerance of the $ZrO_2/{Al_2}{O_3}$ composites prepared by mixing 5.31 mol% ${Y_2}{O_3}$-4.45 mol% ${Nb_2}{O_5}$-90.31 mol% $ZrO_2$ and ${Al_2}{O_3}$ was investigated. The composites exhibited rising R-curve behavior and plateau fracture toughness of 7.9 and $8.8MPam^{1/2}$ for the additions of 20 vol% of 0.2 and $2.8{\mu}m$ ${Al_2}{O_3}$ particles, respectively. The difference in the fracture toughness resistance was attributed mainly to the grain size of tetragonal $ZrO_2$ phase in the composites, which scaled with the ${Al_2}{O_3}$ particle size.
외부전계 인가에 의한 조화용융조성 LiNbO<sub>3</sub> 결정의 주기적 분극반전
권순우,양우석,이형만,김우경,이한영,윤대호,송요승,Kwon, Soon-Woo,Yang, Woo-Seok,Lee, Hyung-Man,Kim, Woo-Kyung,Lee, Han-Young,Yoon, Dae-Ho,Song, Yo-Seung 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.11
When an electric field higher than a characteristic coercive field is applied to a ferroelectric such as $LiNbO_3$, the orientation of the spontaneous polarization is reversed, which causes the reversal of the sign of odd-rank tensor properties such as electro-optic and nonlinear optic coefficients. A fabrication process of insulator and periodic external field assisted poling of a z-cut $LiNbO_3$ have been optimized for a periodic $180^{\circ}$ phase inversion along z-axis. The poling jig and the poling control system, fully controlled by a computer, for high quality and reproducible PPLN fabrication have been devised. Periodically polarization reversed PPLN was adjusted based on the fabricated thickness of insulator. The poling structure of PPLN was observed under a microscope after etching PPLN samples by an etching solution ($HF:HNO_3$ = 1 : 2) for about 15 min.
전착된 나노 결정질 니켈-철 합금의 미세구조 및 물성에 대한 철의 영향
변명환(Myung-Hwan Byun),조진우(Jin-Woo Cho),송요승(Yo-Seung Song) 한국표면공학회 2005 한국표면공학회지 Vol.38 No.4
Nickel-iron nanocrystalline alloys with different compositions and grain sizes were fabricated by electro-plating for MEMS devices. The iron content of the deposits was changed by varying the nickel/iron ion ratio in the electrolyte. X-ray diffraction (XRD) analysis was applied for measuring the strength of the texture and grain size of the deposits. The nickel/iron atom ratio of the deposits was analyzed by EDS. The hardness of the alloys was evaluated by Vickers hardness indenter. The internal stress of the deposits was measured by Thin Film Stress Measurement using Stoney's formula. Surface morphology and roughness were investigated by Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM). The results of this study revealed that at a grain size of approximately 17-24 ㎚ the hardness, internal stress and roughness depend strongly on the iron content. With increasing the iron content, the hardness and internal stress of the deposits increased. An excellent correlation between the increase in the internal stress and the loss of (200) texture was found.
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.