• Title/Summary/Keyword: 탄소 섬유 복합 재료

Search Result 268, Processing Time 0.041 seconds

Development of Composite Bipolar Plate for Vanadium Redox Flow Battery (바나듐 레독스 흐름 전지용 복합재료 분리판 개발)

  • Lim, Jun Woo
    • Composites Research
    • /
    • v.34 no.3
    • /
    • pp.148-154
    • /
    • 2021
  • Carbon/epoxy composite bipolar plate (BP) is a BP that is likely to replace existing graphite bipolar plate of vanadium redox flow cell (VRFB) due to its high mechanical properties and productivity. Multi-functional carbon/epoxy composite BP requires graphite coating or additional surface treatment to reduce interfacial contact resistance (ICR). However, the expanded graphite coating has the disadvantage of having low durability under VRFB operating conditions, and the surface treatments incur additional costs. In this work, an excessive resin absorption method is developed, which uniformly removes the resin rich area on the surface of the BP to expose carbon fibers by applying polyester fabric. This method not only reduces ICR by exposing carbon fibers to BP surfaces, but also forms a unique ditch pattern that can effectively hold carbon felt electrodes in place. The acidic environmental durability, mechanical properties, and gas permeability of the developed carbon/epoxy composite BP are experimentally verified.

A Review of Carbon-Reinforced Carbon Nanotube Fibers Composites (탄소강화 탄소나노튜브 섬유 복합소재 연구 동향)

  • Lee, Dongju;Ryu, Seongwoo;Ku, Bon-Cheol
    • Composites Research
    • /
    • v.32 no.3
    • /
    • pp.127-133
    • /
    • 2019
  • Although carbon nanotubes(CNTs) have outstanding theoretical mechanical and electrical properties, CNT fibers(CNTFs) have not yet reached that level. Particularly, tensile strength is only about 10% or less, so studies for making up for it are being actively conducted. As a way for improving mechanical strength, methods such as synthesizing long CNT, orientation, chemical cross-linking, hydrogen bonding and polymer infiltration are being studied. In this review paper, we report preparation methods for highly conductive and strong CNTF/Carbon composites through coating and infiltration followed by carbonization of carbon precursor polymers such as polyacrylonitrile (PAN) and polydopamine (PDA) on CNTFs.

Microstructural Evaluation of $CO_2$ Oxidation Process of High Modulus Carbon Fibers by XRD Analysis (XRD를 이용한 고강성 탄소섬유의 이산화탄소 산화 중에 발생하는 구조변화 해석)

  • 노재승
    • Proceedings of the Materials Research Society of Korea Conference
    • /
    • 2003.03a
    • /
    • pp.228-228
    • /
    • 2003
  • 고강성 탄소섬유는 높은 비강도 및 고 강성 특성 때문에 탄소-탄소 복합재료의 가장 우수한 강화재로 각광을 받고 있다. 이 섬유는 미세 결정립의 높은 이방성을 나타내며, 이러한 높은 흑연화 특성은 기계적, 전기적, 전기적 그리고 화학적 특성 등을 좋게한다. 이러한 모든 방면에서의 우수한 특성 때문에 항공우주 재료분야에 의심 없이 가장 우수한 재료로 고려되고 있다. 이렇게 가벼우면서 고온강도가 요구되는 재료로써 탄소재료가 이용되면서 rocket의 nozzle이나 nosecone으로의 응용에는 고온 산화가 중요한 연구주제로 대두되어 왔다. 탄소재료의 산화반응은 결정구조 인자 및 그 배열에 가장 큰 영향을 받는다고 알려져 있는데, 출발원료 및 제조 조건에 따라 그 구조 및 배열이 현격하게 달라진다. 탄소재료의 구조 해석은 주로 TEM과 XRD를 이용해 왔다. 많은 연구자들은 오래 전부터 탄소재료 연구에 TEM에서 얻은 상이 불확실하고 문제가 있다고 보고하였고, 최근 TEM 장치의 발달과 더불어 실제 구조를 얻기가 가능함을 보여주고 있다 그러나 TEM 시편은 여전히 작고 시편으로부터 얻는 정보는 불과 nm 수준이다. 따라서 일반적으로 TEM으로 얻은 정량적인 정보는 불과 특정한 점에서의 정보이기 때문에 여전히 논란의 소지가 많다. XRD는 탄소재료의 미세구조 해석을 위하여 가장 널리 이용되는 분석기기이다.

  • PDF

Investigation of Interfacial Adhesion of Different Shapes of Nano Carbon Fillers Reinforced Glass Fiber/Epoxy Composites by Spray Coating (형상이 다른 나노입자 스프레이 코팅에 따른 탄소계 강화 유리섬유와 에폭시 수지간 계면강도 관찰)

  • Kwon, Dong-Jun;Wang, Zuo-Jia;Choi, Jin-Young;Shin, Pyeong-Su;Lee, En-Seon;Park, Joung-Man
    • Composites Research
    • /
    • v.27 no.3
    • /
    • pp.109-114
    • /
    • 2014
  • Manufacture of nancomposites has simple process for developing nanocomposites due to the increasing applications using nanofillers. This work studied nanofiller coated glass fiber for reinforcing material with good wetting and conductivity and the morphology of nanofiller coated glass fiber was analyzed by FE-SEM. The durability of reinforced glass fiber was investigated with different shapes of nanofillers using sonication rinsing method. Fatigue test was performed to evaluate the adhesion of reinforcing interface and stability of nanofiller coating layer for single fiber reinforced composites. Apparent modulus and conductivity of nanofiller coating layer were evaluated to realize multifunctional of nanocomposites. Fiber type of nanofiller was better than plate type due to better cohesion between fiber and nanofillers. At last, the stability of fiber type nanofiller of coating layer has better durability and conductivity than plate type case.

Microstructure and Electromagnetic Characteristics of MWNT-filled Plain-Weave Glass/Epoxy Composites (다중벽 탄소나노튜브가 첨가된 평직 유리섬유/에폭시 복합재료의 미세구조 및 전자기적 특성)

  • Lee, Sang-Eui;Park, Ki-Yeon;Lee, Won-Jun;Kim, Chun-Gon;Han, Jae-Hung
    • Composites Research
    • /
    • v.19 no.1
    • /
    • pp.36-42
    • /
    • 2006
  • MWNT(multi-walled carbon nanotube)-filled plain-weave glass/epoxy composites were fabricated and electromagnetic characteristics of the composites were investigated. The observation of the microstructures of the composites revealed that MWNTs are mostly distributed in matrix rich region and the interface between glass fiber yarns in warp and fill direction. The permittivity of the composites, measured in X-band (8.2-12.4 GHz) frequency range, increased with weight fraction of MWNTs and remained almost constant with frequency. The measured permittivity was used to investigate the reflection loss of radar absorbing structures (RAS) composed of MWNT-filled composites according to thickness and a RAS were constructed with 10 dB absorbing bandwidth 4.2 GHz and 3.3 mm in thickness.

Structural Analysis of Gas Pipeline Repaired by Carbon Fiber Composite Materials (탄소 섬유 복합재료로 보수된 가스 배관의 구조 해석)

  • Park, Sungho;Kim, Hansang
    • Journal of the Korean Institute of Gas
    • /
    • v.18 no.2
    • /
    • pp.62-68
    • /
    • 2014
  • Composite repair methods besides welding methods such as surfacing and sleeve welding have been used as repair of damaged gas pipelines in foreign countries. Importance of safety management of city gas pipelines have been emphasized recently and our own repair manuals and codes for repair of city gas pipelines are required. It is right time to conduct research on the composite repair methods since the composite repair was introduced rather recently compared to the welding repair methods which have been investigated for long time. In this study, as a starting point of safety assessment of gas pipeline repaird by composite materials, structural analysis of gas pipeline repaired by carbon fiber composite materials was conducted using finite element analysis(FEA) method and the results was discussed.

Prediction of Wetting and Interfacial Property of CNT Reinforced Epoxy on CF Tow Using Electrical Resistance Method (전기저항 평가법을 이용한 CNT 함유 에폭시의 탄소섬유내 젖음성 및 계면특성 예측 연구)

  • Kwon, Dong-Jun;Choi, Jin-Yeong;Shin, Pyeong-Su;Lee, Hyung-Ik;Lee, Min-Gyeong;Park, Jong-Kyoo;Park, Joung-Man
    • Composites Research
    • /
    • v.28 no.4
    • /
    • pp.232-238
    • /
    • 2015
  • As a new method to predict the degree of dispersion in carbon nanocomposites, the electrical resistance (ER) method has been evaluated. After CNT epoxy resin was dropped on CF tow, the change in electrical resistance of carbon fiber tow was measured to evaluate dispersion condition in CNT epoxy resin. Good dispersion of CNTs in carbon nanocomposite exhibited low change in ER due to wetted resin penetrated on CF tow. However, because CNT network was formed among CFs, non-uniform dispersion occurred due to nanoparticle filtering effect by CF tow. The change in ER for poor dispersion exhibited large ER signal change. The change in ER was used for the dispersion evaluation of CNT epoxy resin. Correlation between interlaminar shear strength (ILSS) and dispersion condition by ER method was established. Good CNT dispersion in nanocomposites led to good interfacial properties of fiberreinforced nanocomposites.

Measurement of Electrical Resistance Method in Characterizing the Slip ratio of Carbon fiber/Matrix at the Interface (전기저항 측정법을 이용한 탄소섬유/기지 간 계면에서의 섬유 미끌림 정도 측정방법)

  • Kwon, Dong-Jun;Wang, Zuo-Jia;Gu, Ga-Young;Park, Joung-Man
    • Composites Research
    • /
    • v.25 no.6
    • /
    • pp.205-210
    • /
    • 2012
  • The single carbon fiber tensile test was performed with electrical resistance measurement. Tensile property of single carbon fiber which accompanied by the relationship between the electric resistance and the strain was investigated. Since the collected data showed a linear relationship between them, the coefficient of fiber slip ratio (FSR) was obtained by computation. The fragmentation specimen (FS) was tested under tensile loading, and the single carbon fiber broke first due to the stress transferring form matrix to reinforcing fiber. The stress distribution of carbon fiber could be observed via the electrical resistance change. Slipping between carbon fiber and matrix was predicted based on the fragmentation test results, and the FSR was used to evaluate interfacial adhesion comparatively. The large FSR indicated poor interfacial bonding. Work of adhesion between carbon fiber and matrix was measured to verify the FSR method, and two results exhibited a consistent conclusion.