• Title/Summary/Keyword: Surface Treatment

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A study on the Polymer surface treatment of GF-filter bag for collection of fine Particle like carbon black (카본블랙류 미세입자 포집을 위한 유리섬유 필터백의 고분자 표면처리에 관한 연구)

  • Lee, B.;Choi, H.L.;Moon, C.K.
    • Journal of Power System Engineering
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    • v.12 no.3
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    • pp.55-59
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    • 2008
  • In this paper, we have investigated on collection efficiency of fine particle of glass fiber-filter bag according to the surface treatment. The solution consisted of polytetrafluoroethylene(teflon), graphite powder, silicon resin and water was used as a basic surface treatment agent. Tensile strength of glass filter-bag increased with up to 3hrs and then decreased with surface treatment time. Tensile strength and initial modulus of the glass fiber-filter bag treated by iodine after basic surface treatment for 3hrs were lower than those of basic surface treatment for 3hrs, however collection efficiency and fracture strain were higher than those of basic surface treatment for 3hrs. Glass fiber-filter bag with lower initial modulus and more strain will be extend the durable period and the one treated by iodine after basic surface treatment 3or 3hrs is expected high collection efficiency of fine particle. This method makes it possible to manufacture glass fiber-filter bag of the optimum condition.

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Development of An Eco-friendly Surface Treatment Process for the Design of the Al Lead Tab in Lithium-ion Batteries

  • Cheon, Jeongsuk;Kim, Jongwon
    • Journal of the Korean Chemical Society
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    • v.64 no.3
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    • pp.153-158
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    • 2020
  • With the recent popularity of mobile devices, the demand for lithium-ion batteries is increasing. In this study, the surface treatment process for the development of the Al (aluminum) lead tab for positive electrode, a key component of the pouch-type lithium-ion battery, was investigated. Anodizing and sealing processes were tested as surface treatment techniques. It was found that only a sealing process is needed to obtain sufficient adhesive strength. In the present study, an adhesive strength of 17 N/12 mm was achieved by degreasing and etching pretreatment, followed by a sealing process of 10 min duration. This adhesive strength was greater than that achievable using Cr (chromium) surface treatment. Using various surface analysis techniques, the shape and composition of the surface before and after being subjected to the surface treatment were compared and analyzed. The results of this study are expected to contribute to the development of an eco-friendly lead tab.

Optimization of Surface Treatment System for Concrete Structures to Control Chloride Penetration (콘크리트 구조물용 표면도장공법의 차염성능의 최적화에 대한 연구)

  • Lee Chang-Soo;Sung Jae-Duk;Yoon In-Seok
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.233-236
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    • 2004
  • The purpose of this paper is to evaluate performance on reducing the chloride diffusion of surface treatment systems with elapsed time, treatment thickness, treatment frequency, and the types of surface treatment - coating, penetrator, and both all. Based on this paper, the guideline to applicate surface treatment systems will be established and comprehended how effective the resistance of chloride diffusion is. The selection of surface treatment materials and thickness to acquire service life of target will be possible. It is also expected to select optimum surface treatment system groups to resist chloride diffusion effectively and to estimate increased service life as the effect of durability enhancement.

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Experimental Study on the Improvement of Surface Treatment of Mechanical Structures in Field Environment (야전 환경에서 기계구조물 표면처리 개선에 관한 실험적 연구)

  • Kim, Jongwha;Hyun, Jonghun;Kang, Seokjoong
    • Journal of the Korea Institute of Military Science and Technology
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    • v.24 no.2
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    • pp.197-203
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    • 2021
  • Mechanical structures of military equipment have been mainly applied with black oxide coating due to the limitation of surface treatment thickness. However, the mechanical structures applied by the black oxide coating treatment is constantly being corroded by calcium chloride and humidity. Since this can cause serious problems in the operation of equipment, a review to improve surface treatment and corrosion resistance is required. Therefore, in this study, surface treatment methods that can enhance corrosion resistance were selected and corrosion resistance performance was verified through experiments describing harsh field conditions. Thus, applying a proven surface treatment method to future military equipment will prevent corrosion.

Development of Surface Treatment Systems for Concrete Structures to Extend Service Life (내구수명 증진을 위한 콘크리트 구조물용 표면처리공법 개발)

  • Lee, Chang-Soo;Yoon, In-Seok;Lee, Kyu-Dong;Park, Jong-Hyuk
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.6 no.2
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    • pp.255-261
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    • 2002
  • Concrete structures stand in poor surrounding than it has ever been met before, because they are installed in severe conditions such as chloride penetration. $CO_2$ gas, water and so on. Therefore, the countermeasure to efficiently protect from the deterioration of concrete structures should be urgently considered. From this point of view, this study was aimed to develop surface treatment systems for concrete structures, which cover physical properties, long term durability and economic consideration. Developing the optimal surface treatment materials, powder type polymer or liquid type polymer was added to inorganic base materials. Three surface treatment materials which had shown best results in primary tests were selected and durability tests were fulfilled. Consequently optimum surface treatment material was developed. The surface treatment materials, which were developed through this study, can efficiently extend the service life of concrete structures. As a result, the life cycle cost should be reduced and the waste of material resources would be cut down.

A Study on Verification Method for the Performance of Surface-Treatment Agent Applied on Concrete (도포형 표면강화제 적용 콘크리트의 성능 검증법에 관한 연구)

  • 고경택;김성욱
    • Proceedings of the Korea Concrete Institute Conference
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    • pp.1025-1030
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    • 2000
  • Recently, surface-treatment agent was developed to restore performance of the deteriorated concrete and inhibiting corrosion of the reinforcing-bar. The performance of surface-treatment agent was verified and this agent has been broadly in America and European countries. However, this type agent has not been used broadly in Korea because performance of the agent isn't verify by a proper test method yet. In this study, we suggested our own test procedures and methods through extensive laboratory tests to verify the performance of concrete after applying the surface-treatment agent.

Shear bond strength of composite resin to high performance polymer PEKK according to surface treatments and bonding materials

  • Lee, Ki-Sun;Shin, Myoung-Sik;Lee, Jeong-Yol;Ryu, Jae-Jun;Shin, Sang-Wan
    • The Journal of Advanced Prosthodontics
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    • v.9 no.5
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    • pp.350-357
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    • 2017
  • PURPOSE. The object of the present study was to evaluate the shear bonding strength of composite to PEKK by applying several methods of surface treatment associated with various bonding materials. MATERIALS AND METHODS. One hundred and fifty PEKK specimens were assigned randomly to fifteen groups (n = 10) with the combination of three different surface treatments (95% sulfuric acid etching, airborne abrasion with $50{\mu}m$ alumina, and airborne abrasion with $110{\mu}m$ silica-coating alumina) and five different bonding materials (Luxatemp Glaze & Bond, Visio.link, All-Bond Universal, Single Bond Universal, and Monobond Plus with Heliobond). After surface treatment, surface roughness and contact angles were examined. Topography modifications after surface treatment were assessed with scanning electron microscopy. Resin composite was mounted on each specimen and then subjected to shear bond strength (SBS) test. SBS data were analyzed statistically using two-way ANOVA, and post-hoc Tukey's test (P<.05). RESULTS. Regardless of bonding materials, mechanical surface treatment groups yielded significantly higher shear bonding strength values than chemical surface treatment groups. Unlike other adhesives, MDP and silane containing self-etching universal adhesive (Single Bond Universal) showed an effective shear bonding strength regardless of surface treatment method. CONCLUSION. Mechanical surface treatment behaves better in terms of PEKK bonding. In addition, self-etching universal adhesive (Single Bond Universal) can be an alternative bonding material to PEKK irrespective of surface treatment method.

Control of Contact Angle by Surface Treatment using Sanning Plasma Method (주사 플라즈마 법(SPM)을 이용한 소수성 표면처리)

  • Kim, Young-Gi;Choi, Byoung-Jung;Yang, Sung-Chae
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.1
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    • pp.10-13
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    • 2010
  • The plasma processing technologies of thin film deposition and surface treatment technique have been applied to many industrial fields. This study is purposed Large-area uniformity and surface treatment on the stainless substrate. We treat surface of stainless by $CF_4$ plasma. $CF_4$ plasma is generated by using SPM(Scanning plasma method)which is kind a of CVD. Generally, SPM has been used for uniform surface treatment using a crossed electromagnetic field. The optimum discharge condition has been studied for the gas pressure, the magnetic flux density and the distance between substrate and electrodes. In result, contact angle is increased by surface treatment using $CF_4$ Plasma. Therefore we expect that SPM to control contact angle is applied to many industries.

A Study on Fatigue Strength Influence of Surface Treatment on High Strength Steel SNCM8 (고장력강 SNCM8재의 표면처리에 따른 피로강도 변화)

  • 강신현;차정환;배성인
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.697-703
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    • 1996
  • Fatigue strength of high strengthsteels are variable with many different surface treatment. It is well known that residual compressive stress retard fatigue crack growth rate(or arrest crack). High strngth steels are manufactured by following process. Heat treatment, shot peening and chromium plating process. High strength steel(HRC40 or above) which are subjected to fatigue load and dynamic load, chromium plated parts shall be peened in accordance with requirements and baked after plating. The purpose of this paper is to compare and discuss the influence of surface treatment and hydrogen embrittlement on fatigue strength of high strength steel. Therefore, fatigue test was performed to investigate influence of surface treatment. The results shows that shot peening is very effect method in creasing fatigue life and after plating, baking process is essential to prevent hydogen failure. In this paper, the experimental investigation is made to clarify the influence of shot peening conditions and baking process on fatigue strength of high strength steel.

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An Experimental Study of the Surface Treatment Effect on the Frosting/Defrosting Behavior of a Fin-Tube Heat Exchanger (휜-관 열교환기의 착.제상 거동에 대한 표면처리의 영향에 관한 실험적 연구)

  • Jhee, Sung;Lee, Kwan-Soo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.24 no.8
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    • pp.1062-1068
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    • 2000
  • The effect of heat exchanger surface treatment on the frosting/defrosting behavior in a fin-tube heat exchanger is investigated experimentally. It is found that the hydrophilic surface mainly influences on the frosting behavior, however, the hydrophobic surface gives some influence on the defrosting behavior. In view of frosting performance, surface-treated heat exchanger with either hydrophilic or hydrophobic characteristic shows a little improvement in the thermal performance than the aluminium heat exchanger with no surface treatment. The result reveals that the heat exchanger with hydrophobic surface treatment is more effective in view of the defrosting efficiency and time. The amounts of residual water on the surface-treated heat exchangers are shown to be smaller than those of the bare heat exchanger, therefore further improvements on the performance of re-operations are expected.