• Title/Summary/Keyword: Coating Films

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Characteristics on Cured Thin Film of Sol-Gel Materials Synthesized from CS/MTMS/ES (CS/MTMS/ES 졸겔코팅제 경화박막의 특성)

  • Myung, In-Hye;Kang, Dong-Pil;Ahn, Myeong-Sang;Na, Moon-Kyong;Kang, Young-Taec
    • Proceedings of the KIEE Conference
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    • 2005.07c
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    • pp.1930-1932
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    • 2005
  • Colloidal Silica(CS)/methyltrimethoxy silane(MTMS) and CS/MTMS/epoxy silane(Es) sol solutions were prepared in variation with synthesizing parameters such as kinds of CS, kinds of silane and reaction time. In order to understand its physical and chemical properties, sol-gel coating films on glass were fabricated. In the case of CS/MTMS sol, the coating films had high contact angle and more enhanced flat surface than those in the case of CS/MTMS/ES sol. Also, the coating films obtained from single CS had a better flat surface than those obtained from mixed CS. In the case of thermal stability, thermal dissociation of CS/MTMS and CS/MTMS/ES sol-gel coating films did not occur up to $550^{\circ}C$ and $440^{\circ}C$ respectively. The thickness of coating films obtained from CS/MTMS sol increased than those of CS/MTMS/ES sol. In addition, the coating films obtained from single CS were more thicker than those obtained from mixed CS.

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Study on the Frictional Behavior, Wear and Corrosion Resistance of Textured TiN Coated Layers (집합조직이 존재하는 TiN 코팅 층의 마찰, 마멸, 내부식 특성에 관한 연구)

  • 김희동;김인수;성동영;이민구
    • Transactions of Materials Processing
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    • v.12 no.4
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    • pp.394-400
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    • 2003
  • TiN coated films exhibit excellent mechanical properties such as high wear, erosion and corrosion resistances and a high thermal stability. Therefore, they are widely applied to a coating material in tools, ornaments, parts and semiconductors. However, the fracture of TiN coated films frequently occurs. The distribution of preferred orientations, i.e., texture, of TiN coated films strongly influences the fracture behavior of these films. In the present study. various TiN coating layers having different textures were prepared by the reactive ion physical vapor deposition and the texture dependence of friction coefficient, erosion and corrosion in these coating layers was investigated. The sample depicting the (115) texture parallel to the coating layer normal displayed a flatter surface than that observed from the sample having the (111) texture. The friction coefficient of TiN thin films was hardly dependent on the texture of coated samples. The samples having (115) texture displayed higher wear, erosion and corrosion resistances than the samples having (111) texture.

Preparation of Water Repellent Polyurethane Coating Films Using Perfluoroalkyl Alcohol (과불화 알코올을 이용한 발수성 폴리우레탄 코팅 필름의 제조)

  • Kim, Nam Woo;Ahn, Chi Young;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.54 no.3
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    • pp.387-393
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    • 2016
  • Fluorinated polyurethane coating solutions were synthesized from perfluoroalkyl alcohol, toluene diisocyanate, and polycarbonate diol as starting materials. Next, coating films were prepared by spin-coating the fluorinated polyurethane coating solutions on the PC substrates, followed by thermal curing at $120^{\circ}C$. The obtained fluorinated polyurethane coating films were characterized by FT-IR spectroscopy, UV-Vis spectrometer, contact angle tester and pencil hardness tester. Contact angle measurements of water on the coating films showed that the addition of perfluoroalkyl alcohol improved the water repellency and increased the contact angle from $81^{\circ}C$ to $111^{\circ}C$. However, the pencil hardness of coating films exhibited a constant grade of H, irrespective of the addition of perfluoroalkyl alcohol.

Mechanical Property Evaluation of Diamond-like Carbon Coated by PE-CVD (PE-CVD방법을 이용한 DLC 박막의 기계적특성 평가)

  • Kang Seog Ju;Yi Jin-Woo;Kim Seock Sam
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2003.11a
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    • pp.368-376
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    • 2003
  • In this research, DLC thin films are produced as several hundred nm thickness by PE-CVD method. And then these thin films are estimated tribological characteristics to find out useful possibilities as a protecting film for high-quality function and life extension at MEMs by mechanical properties observation . These are measured thickness and residual stress of DLC coating. Compared after measuring friction coefficient, adhesion force, hardness, cohesive force of coating films. As results all test, we can decide several conclusions. First, friction coefficient decreased, as the load increased. otherwise, friction coefficient increased, as thickness of coating film increased under low load$(1\~50mN)$. Secod, adhesion force increased as thickness of coating films. Third, hardness of coating film is affected by substrate coating film when it is less than thickness of 300nm and it has general hardness of DLC coating film when it is more than thickness of 500nm. Fourth, cohesive force of coating film is complexly affected by hardness, adhesion force, residual stress, etc.

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Characterization of Yttrium Doped Zinc Oxide Thin Films Fabricated by Spin-coating Method (스핀코팅법에 의해 제조되어진 Yttrium이 도핑된 ZnO 막의 특성)

  • Kim Hyun-Ju;Lee Dong-Yun;Song Jae-Sung
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.5
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    • pp.457-460
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    • 2006
  • Y doped zinc oxide (YZO) thin films were deposited on F doped $SnO_2$ (FTO) glass substrate by sol-gel method using the spin-coating system. A homogeneous and stable solution was prepared by dissolving acetate in the solution added diethanolamine as sol-gel stabilizer. YZO films were obtained after preheated on the hot-plate for 5minute before each coating; the number of coating was 3 times. After the coating of last step, annealing of YZO films performed at $450^{\circ}C$ for 30 minute. In order to confirming of a ultraviolet ray interruption and down-conversion effects, optical properties of YZO films, transmission spectrum and fluorescent spectrum were used. Also, for understanding the obtained results by experiment, the elestronic state of YZO was calculated using the density functional theory The results obtained by experiment were compared with calculated structure. The detail of electronic structure was obtained by the discrete variational Xa (DV-Xa) method, which is a sort of molecular orbital full potential method. The density of state and energy levels of dopant element were shown and discussed in association with optical properties.

Surface Properties of Re-Ir Coating Thin Film on Tungsten Carbide Surface (Tungsten Carbide 표면에 코팅된 Re-Ir 박막의 표면 특성)

  • Lee, Ho-Shik;Cheon, Min-Woo;Park, Yong-Pil
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.24 no.3
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    • pp.219-223
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    • 2011
  • Rhenium-Iridium(Re-Ir) thin films were deposited onto the tungsten carbide(WC) molding core by sputtering system. The Re-Ir films were prepared by multi-target sputtering with iridium, rhenium and chromium as the sources. Argon and nitrogen were inlet into the chamber to be the plasma and reactive gases. The Re-Ir thin films were prepared with targets having atomic percent of 3:7 and the Re-Ir thin films were formed with 240 nm thickness. The Re-Ir thin films on tungsten carbide molding core were analyzed by scanning electron microscope(SEM) and surface roughness. Also, adhesion strength and coefficient friction of Re-Ir thin film were examined. The Re-Ir coating technique has been intensive efforts in the field of coating process because the coating technique and process have been their feature, like hardness, high elasticity, abrasion resistance and mechanical stability and also have been applied widely the industrial and biomedical areas. In this report, tungsten carbide(WC) molding core was manufactures using high performance precision machining and the efforts of Re-Ir coating on the surface roughness.

Crystallization and Crack Formation in Sol-Gel PLZT Thin Films (졸-겔법에 의한 PLZT 박막의 결정화 및 균열 생성)

  • 안기철;이전국;김호기;노광수
    • Journal of the Korean Ceramic Society
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    • v.29 no.3
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    • pp.216-222
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    • 1992
  • PLZT thin films were prepared using sol-gel spin coating. The films mainly consisted of perovskite phase when heat treated at 600$^{\circ}C$ and in O2 or air atmosphere for 2 hours after 7 coating cycles. Cracks were formed when smaller than after 9 coating cycles. When ITO interlayer existed between Corning 7059 glass substrate and the film, cracks were not formed after 9 coating cycles, but cracks were formed after 11 coating cycles because of large volume change of the film contracting on the substrate during the heat treatment. In the observation of microstructure, the thin films have perovskite phase of about 2 $\mu\textrm{m}$ grain size and pyrochlore phase of 100∼200${\AA}$ grain size.

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Preparation of Hard Coating Films with High Refractive Index from Titania Nanoparticles (이산화티탄 나노입자로부터 고굴절 하드코팅 도막의 제조)

  • Kim, Nam Woo;Ahn, Chi Yong;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.53 no.6
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    • pp.762-769
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    • 2015
  • The titania ($TiO_2$) nanoparticles with a diameter 2?3 nm were synthesized by controlling hydrolysis of titanium tetraisopropoxide (TTIP) in acid solution. Organic-inorganic hybrid coating solutions were prepared by reacting the titania nanoparticles with 3-glycidoxypropyl trimethoxysilane (GPTMS) by the sol-gel method. The hard coating films with high refractive index were obtained by curing thermally at $120^{\circ}C$ after spin-coating the coating solutions on the polycarbonate (PC) sheets. The coating films showed high optical transparency of 90% in the visible range and exhibited a pencil hardness of 2H. Also, the refractive index at 633 nm wavelength of coating films enhanced from 1.502 to 1.584 as the weight content of titania nanoparticles in the coating solutions increased from 4% to 25%.

Preparation of Hard Coating Films with High Refractive Index using Organic-Inorganic Hybrid Coating Solutions (유-무기 하이브리드 코팅 용액을 이용한 고굴절 하드코팅 막의 제조)

  • Choi, Jin Joo;Kim, Nam Uoo;Ahn, Chi Yong;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.52 no.3
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    • pp.388-394
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    • 2014
  • Inorganic-organic hybrid coating solutions were synthesized using titania sol from titanium isopropoxide (TTIP) as an inorganic component and mixture of two or three types of silane coupling agents, such as methacryloxypropyl trimethoxysilane (MPTMS), aminopropyl triethoxysilane (APS), glycidoxypropyl trimethoxysilane (GPTMS) and vinyltriethoxysilane (VTES) as an organic component. The hard coating films were obtained by spin-coating on the polycarbonate sheets and curing the inorganic-organic hybrid coating solutions. The coating films made from the mixture of two types of silane coupling agents showed poor pencil hardness and adhesion, while those from the mixture of three types of silane coupling agents exhibited an improved pencil hardness of 2H~4H and adhesion of 5B. The refractive indexes of coating films were increased from 1.56 to 1.63 at 550 nm by increasing the content of titania sols from 20 to 30 g.

Effect of Types of Colloidal Silica on Properties of Hydrophilic Coating Films (콜로이드 실리카 종류가 친수성 코팅 필름의 물성에 미치는 영향)

  • Yang, Jun Ho;Song, Ki Chang
    • Korean Chemical Engineering Research
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    • v.55 no.6
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    • pp.830-836
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    • 2017
  • Hydrophilic coating solutions were prepared by reacting a silane coupling agent, GPTMS (3-glycidoxypropyl trimethoxysilane) with colloidal silica. Hydrophilic coating films were also obtained by depositing the hydrophilic coating solutions on polycarbonate substrates by spin-coating and subsequently by thermal curing at $120^{\circ}C$. During this process, the effect of average particle sizes of colloidal silica was studied on the properties of coating films. As a result, coating film, prepared from colloidal silica with average particle size of 25 nm, showed a low contact angle of $20^{\circ}$ and a good pencil hardness of H. On the other hand, coating films, prepared from colloidal silica with average particle sizes of 15 nm and 45 nm, exhibited high contact angles of $27^{\circ}$ and $36^{\circ}$ and pencil hardness of H and B, respectively.