• Title, Summary, Keyword: Electrodeposition (ED)

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The Study of High-functioning Electrodeposition Technology That Pearl-like Feeling Expressed for Medical Devices for Smart Health (펄감을 표현하는 스마트 헬스 의료기기용 고기능 전착기술에 관한 연구)

  • Chang, Ho-Gyeong;Lee, Il-Bong
    • Progress in Medical Physics
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    • v.26 no.4
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    • pp.273-279
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    • 2015
  • Recently, medical devices for a smart health development and dissemination are becoming increasingly frequent use of devices and their's thermal stability, durability, the external splendors are required. Industrial demand for smart health medical devices uses high-functioning electrodeposition technology that expressed pearl-like feeling is rapidly increasing. Generally, pearl powder is added to electrodeposition pigment in order to form a coating which shows pearl-like feeling. On the other hand, the electrodeposition technology for the smart health medical devices uses a new method that can express pearl-like feeling without using pearl powder. In this study, we was tried to find out the most appropriate texture formation, the right dilution recipe. We've tried various ptoportions of pigments (ED-600, ED-600S, ED-MX, ED-M). As a result, we found out that ED-600 and ED-MX (15% solid) in appropriate concentration showed the best adherence rate. By several samples tests and experiments which include washing the fixed pigment in various temperature levels ($20{\sim}40^{\circ}C$) and drying, we were able to get the best results in drying condition of $180{\pm}10^{\circ}C$ and $30{\pm}5min$. The research showed that it is mush more competitive and cost effective to use the new method that produces natural pearl-like feeling on the surface than to add pearl powder to high-functioning electrodeposition pigment, which is a method that has been used for the smart health medical devices so far.

Study on the Physical Properties by Combining Epoxy and Acryl Electrodeposition Paints (에폭시와 아크릴 전착도료의 혼용성에 따른 물성 변화 연구)

  • Jung, Sung Soo;Yi, Dong Uk;Kim, Dong Won;Kim, Myung Hwan;Kwag, Sam Tag;Moon, Myung Jun
    • Journal of the Korean institute of surface engineering
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    • v.47 no.3
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    • pp.137-146
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    • 2014
  • The important drawback of epoxy electrodeposition(ED) coatings is the lack of the weathering resistance caused by the structure of bisphenol A. To improve this yellowing phenomena, acryl ED coatings have been developed. Compared with the epoxy ED coatings, however, acryl ED coatings are relatively weak in the corrosion resistance and mechanical properties. The purpose of this study is complemented their drawbacks by mixing epoxy and acryl ED paints. The salt spray, accelerated weathering test(QUV) and cupping, bending, impact test were employed to investigate the corrosion resistance, weathering resistance, and mechanical properties of ED coatings. When the ratio of acryl to epoxy resin of ED coating is 0.33, the weathering resistances are appropriately improved in condition maintaining the corrosion resistance. It was shown that the weathering resistance for epoxy ED coating was adjusted by optimally mixing acryl ED paint.

Interfacial Properties and Microfailure Mechanisms of Electrodeposited Carbon Fiber/epoxy-PEI Composites by Microdroplet and Surface Wettability Tests (Microdroplet 시험법과 Surface Wettability 측정을 이용한 전기증착된 탄소섬유 강화 Epoxy-PEI 복합재료의 계면물성과 미세파괴 메카니즘)

  • Kim, Dae-Sik;Kong, Jin-Woo;Park, Joung-Man;Kim, Minyoung;Kim, Wonho;Park, In-Seo
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.153-157
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    • 2001
  • Interfacial properties and microfailure modes of electrodeposition (ED) treated carbon fiber reinforced polyetherimide (PEI) toughened epoxy composite were investigated using microdroplet test and the measurement of surface wettability. As PEI content increased, Interfacial shear strength (IFSS) increased due to enhanced toughness and plastic deformation of PEI. In the untreated case, IFSS increased with adding PEI content, and IFSS of pure PEI matrix showed the highest. On the other hand, for ED-treated case IFSS increased with PEI content with rather low improvement rate. The work of adhesion between fiber and matrix was not directly proportional to IFSS for both the untreated and ED-treated cases. The matrix toughness might contribute to IFSS more likely than the surface wettability. Interfacial properties of epoxy-PEI composite can be affected efficiently by both the control of matrix toughness and ED treatment.

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A study on the Interfacial Properties of Electrodeposited Single Carbon Fiber/Epoxy Composites Using Tensile and Compressive Fragmentation Tests

  • Park, Joung-Man;Kim, Jin-Won
    • Macromolecular Research
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    • v.10 no.1
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    • pp.24-33
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    • 2002
  • Interfacial and microfailure properties of carbon fiber/epoxy composites were evaluated using both tensile fragmentation and compressive Broutman tests. A monomeric and two polymeric coupling agents were applied via the electrodeposition (ED) and the dipping applications. A monomeric and a polymeric coupling agent showed significant and comparable improvements in interfacial shear strength (IFSS) compared to the untreated case under both tensile and compressive tests. Typical microfailure modes including cone-shaped fiber break, matrix cracking, and partial interlayer failure were observed under tension, whereas the diagonal slipped failure at both ends of the fractured fiber appeared under compression. Adsorption and shear displacement mechanisms at the interface were described in terms of electrical attraction and primary and secondary bonding forces.

Interfacial and Nondestructive Evaluation of Single Carbon Fiber/Epoxy Composites by Fiber Fracture Source Location using Acoustic Emission (Acoustic Emission 의 섬유파단 Source Location을 이용한 Carbon Fiber/Epoxy Composites의 계면특성 및 비파괴적 평가)

  • Kong, Jin-Woo;Kim, Jin-Won;Park, Joung-Man;Yoon, Dong-Jin
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.116-120
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    • 2001
  • Fiber fracture is one of the dominant failure phenomena to determine total mechanical properties in composites. Fiber fracture locations were measured by optical microscopic method and acoustic emission (AE) as functions of matrix toughness and surface treatment by the electrodeposition (ED), and then two methods were compared. Two AE sensors were attached on the epoxy specimen and fiber fracture signals were detected with elapsed time. The interfacial shear stress (IFSS) was measured using tensile fragmentation test and AE system. In ED-treated case, the number of the fiber fracture measured by an optical method and AE was more than that of the untreated case. The signal number measured by AE were rather smaller than the number of fragments measured by optical method, since some fiber fracture signals were lost while AE detection. However, one-to-one correspondence between the x-position location by AE and real break positions by optical method was generally established well. The fiber break source location using AE can be a valuable method to measure IFSS for semi- or nontransparent matrix composites nondestructively (NDT).

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Comparison of Electrodeposited Carbon Fibers Reinforce Epoxy Composites Using Monomeric and Polymeric Coupling Agents

  • Park, Joung-Man;Kim, Yeong-Min
    • Macromolecular Research
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    • v.8 no.4
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    • pp.153-164
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    • 2000
  • By electrodeposition (ED) using a monomeric- and two polymeric coupling agents, the interfacial shear strength (IFSS) of carbon fiber/epoxy composites was investigated by fragmentation test. ED results were compared with the dipping and the untreated cases under dry and wet conditions. Multi-fiber composites (MFC) were used for the direct comparison for the untreated and the treated cases. Various treating conditions including time, concentration and temperature were evaluated, respectively. Under dry and wet conditions ED treatment exhibited much higher IFSS improvement compared to the dipping and the untreated cases. Monomeric- and polymeric coupling agents exhibited the comparative IFSS improvement. Adsorption mechanism between coupling agents and carbon fiber was analyzed in terms of the electrolyte molecular interactions during ED process based on to the chain mobility. The microfailure modes occurring from the fiber break, matrix and interlayer cracks were correlated to IFSS.

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Interfacial Properties and Curing Behavior of Carbon Fiber/Epoxy Composites using Micromechanical Techniques and Electrical Resistivity Measurement (Micromechanical 시험법과 전기적 고유저항 측정을 이용한 탄소섬유강화복합재료의 계면 물성과 경화거동에 관한 연구)

  • 이상일;박종만
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.17-21
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    • 2000
  • Logarithmic electrical resistivity of the untreated or thin diameter carbon fiber composite increased suddenly to the infinity when the fiber fracture occurred by tensile electro-micromechanical test, whereas that of the ED or thick fiber composite increased relatively broadly up to the infinity. Electrical resistance of single-carbon fiber composite increased suddenly due to electrical disconnection by the fiber fracture in tensile electro-micromechanical test, whereas that of SFC increased stepwise due to the occurrence of the partial electrical contact with increasing the buckling or overlapping in compressive test. Electrical resistivity measurement can be very useful technique to evaluate interfacial properties and to monitor curing behavior of single-carbon fiber/epoxy composite under tensile/compressive loading.

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Interfacial Properties of Electrodeposited Carbon Fibers Reinforced Epoxy Composites Using Fragmentation Technique and Acoustic Emission

  • Yeong-Min Kim;Joung-Man Park;Ki-Won Kim;Dong-Jin Yoon
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.28-31
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    • 1999
  • Carbon fiber/epoxy composites using electrodeposited monomeric and polymeric coupling agents were compared with the dipping and the untreated cases. Treating conditions such as time, concentration and temperature were optimized. Four-fibers embedded micro-composites were prepared for fragmentation test. Interfacial properties of four-fiber composites with different surface treatments were investigated with simultaneous acoustic emission (AE) monitoring. The microfailure mechanisms occurring from fiber break, matrix and interlayer crackings were examined by AE parameters and an optical microscope. It was found that interfacial shear strength (IFSS) of electrodeposited carbon fibers was much higher than the other cases under dry and wet conditions. Well separated and different-shaped AE groups occurs for the untreated and ED treated case, respectively.

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Evaluation of Interfacial Properties on the Electrodeposited Carbon Fiber Reinforced Polyetherimide Toughened Epoxy Composites using Micromechanical Test (Micromechanical 시험법을 이용한 전기증착된 탄소섬유 강화 Polyetherimide로 강인화된 에폭시 복합재료의 계면물성 평가)

  • 박종만;김대식;공진우;김민영;김원호
    • Composites Research
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    • v.15 no.3
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    • pp.39-44
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    • 2002
  • Interfacial properties and microfailure modes or electrodeposition(ED) treated carbon fiber reinforced polyetherimide(PEI) toughened epoxy composites were investigated using microdroplet test. ED was performed to improve the interfacial shear strength(IFSS). As PEI content increased, IFSS increased due to enhanced toughness and plastic deformation of PEI. In the untreated cafe, IFSS Increased with adding PEI content, and IFSS of pure PEI matrix showed the highest. On the other hand, thor ED-treated case IFSS increased with PEI content with rather low improvement rate. In the untreated case, neat epoxy resin appeared brittle microfailure mode, whereas pure PEI matrix exhibited more likely ductile microfailure mode. In the ED-treated case, neat epoxy exhibited more ductile fracture compared to the untreated case. Interfacial properties of epoxy-PEI composite can be affected efficiently by both the control of matrix toughness and ED treatment.

Microfailure Mechanisms of Single-Fiber Composites Using Tensile/Compressive Fragmentation Techniques and Acoustic Emission (인장/압축 Fragmentation시험법과 음향방출을 이용한 단 섬유 복합재료의 미세파괴 메커니즘)

  • 김진원;박종만;윤동진
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.159-162
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    • 2000
  • Interfacial and microfailure properties of carbon fiber/epoxy matrix composites were evaluated using both tensile fragmentation and compressive Broutman tests with acoustic emission (AE). Amino-silane and maleic anhydride polymeric coupling agents were used via the dipping and electrodeposition (ED), respectively. Both coupling agents exhibited higher improvements in interfacial shear strength (IFSS) under tensile tests than compressive cases. However, ED treatment showed higher IFSS improvement than dipping case under both tensile and compressive test. The typical microfailure modes including fiber break, matrix cracking, and interlayer failure were observed during tensile test, whereas the diagonal slippage in fiber ends was observed during compressive test. For both the untreated and treated cases AE distributions were separated well under tensile testing. On the other hand, AE distributions were rather closer under compressive tests because of the difference in failure energies between tensile and compressive loading. Under both loading conditions, fiber breaks occurred around just before and after yielding point. Maximum AE voltage fur the waveform of carbon or basalt fiber breakage under tensile tests exhibited much larger than those under compressive tests.

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