• Title, Summary, Keyword: Carbon/carbon composite

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Evaluation of Tensile Properties of Carbon Fiber Reinforced Composite Laminates with Non-Woven Carbon Mat (부직포를 삽입한 탄소섬유강화 복합적층판의 인장특성 평가)

  • 정성균
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.6 no.4
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    • pp.96-100
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    • 1997
  • Tensile properties of carbon fiber reinforce composite laminates with non-woven carbon mat are evaluated in this paper. Composite laminates are made by inserting non-wovon carbon mat between layers, The specimens were cut and polished according to ASTM standard . Longitudinal and Transverse Young's modulus are obtained by tensile test. Young's moduli without non-woven carbon mat are compared with those with non-woven carbon mat. Longitudinal and Transverse tensile strength are also investigated. Experimental results show that the transverse Young's modulus of composite materials with non-woven carbon mat is about 10% higher than that of composite materials without non-woven carbon mat. Longitudinal tensile strength of composite materials with non-woven carbon mat is about 24% higher than that of composite materials without non-woven carbon mat. Transverse tensile strength and torughness also increase by inserting non-woven carbon mat between layers.

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Development of Carbon Composite Bipolar Plates for Vanadium Redox Flow Batteries

  • Lee, Nam Jin;Lee, Seung-Wook;Kim, Ki Jae;Kim, Jae-Hun;Park, Min-Sik;Jeong, Goojin;Kim, Young-Jun;Byun, Dongjin
    • Bulletin of the Korean Chemical Society
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    • v.33 no.11
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    • pp.3589-3592
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    • 2012
  • Carbon composite bipolar plates with various carbon black contents were prepared by a compression molding method. The electrical conductivity and electrochemical stability of the bipolar plates have been evaluated. It is found that the electrical conductivity increases with increasing carbon black contents up to 15 wt %. When the carbon black contents are greater than 15 wt %, the electrical conductivity decreases because of a poor compatibility between epoxy resin and carbon black, and a weakening of compaction in the carbon composite bipolar plate. Based on the results, it could be concluded that there are optimum carbon black contents when preparing the carbon composite bipolar plate. Corrosion tests show that the carbon composite bipolar plate with 15 wt % carbon black exhibits better electrochemical stability than a graphite bipolar plate under a highly acidic condition. When the optimized carbon composite bipolar plate is applied to vanadium redox flow cells, the performance of flow cells with the carbon composite bipolar plate is comparable to that of flow cells with the graphite bipolar plate.

Mechanical and Thermal Properties of Needle Punched Nonwoven Carbon/Phenol Composite (니들펀칭 부직포 탄소/페놀 복합재료의 역학적 성질 및 열적 성질에 관한 연구)

  • 정경호;강태진
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.50-53
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    • 2000
  • The effect of punching density on the mechanical and thermal properties of nonwoven needle-punched carbon/phenol composite was studied. The carbonized preforms were farmed into composites with phenol resin. The interlaminar shear, tensile and flexural strengths were increased with increasing punching density. However, excessive punching density decreased interlaminar shear and tensile strengths. Erosion rate of carbon/phenol composite was decreased with increasing punching density

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Modification of C/C Composite Bipolar Plate by Addition of Electro-Conductive Carbon Black

  • Ryu, Seung-Kon;Hwang, Taek-Sung;Lee, Seung-Goo;Lee, Sun-A;Kim, Chang-Soo
    • Carbon letters
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    • v.2 no.3_4
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    • pp.165-169
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    • 2001
  • Modification of C/C composite bipolar plate for improving electrical conductivity was carried out by addition of electroconductive carbon black (EC-CB). Carbon black was carefully mixed to methanol-containing phenolic resin, impregnated into 2D-carbon fabrics, hot pressed and then carbonized to obtain composite plate. Inclusion of electro-conductive carbon black enhanced the electrical conductivity of the C/C composites by increasing the conduction path. Addition of 10 vol% carbon black increased the electrical conductivity from 5.5/${\Omega}cm$ to 32/${\Omega}cm$ and reduced the crack formation by filling effect, resulting in the increase of flexural properties of composite plate. However, at carbon black content over 10 vol%, flexural properties decreased by delaminating role of excess carbon black at the interface in C/C composites.

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Study on the Fabrication and the Properties of C/C Composite from Clutter Chopped Carbon Fiber by Warmer-Molding Technology

  • Chen, Jianxun;Huang, Qizhong
    • Carbon letters
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    • v.7 no.4
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    • pp.241-244
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    • 2006
  • Carbon/Carbon composite was been manufactured by the technology of warmer-molding process of clutter chopped carbon fiber, using phenolic resin as an adhesive. The degree of graphitization, the microstructure and the friction properties were studied. The results show that the clutter chopped carbon fiber fully scatter in the Carbon/Carbon composite and the degree of graphitization of phenolic resin can reach up to 86.2%, this matrix carbon can form the continuous and stable graphitic thin film on the friction surface during braking process so that the composite has fine friction properties and low wear rate.

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On the Mechanical and Thermal Properties of Carbon/Phenolic Interply Hybrid Composite (탄소/페놀 하이브리드 복합재료의 역학적 특성 및 열적 특성에 관한 연구)

  • 신승준;박종규;강태진;정관수
    • Proceedings of the Korean Society For Composite Materials Conference
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    • pp.29-32
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    • 2002
  • The mechanical and thermal properties of spun carbon fabric/continuous carbon fabric interplay hybrid composite materials have been studied. The properties of the hybrid composites are compared with those of the continuous carbon fabric/phenolic composites and spun carbon fabric /phenolic composites. Through hybridization, tensile strength and flexural strength of hybrid composites were increased by about 17%, and 10%, respectively compared with spun carbon composites. The thermal conductivity of the hybrid composite is lower approximately 4~6% along the direction parallel to the laminar plane than that of the continuous carbon/phenolic composite.

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The Vibration Characteristic of Carbon-Carbon Composite Material due to Tensile Loading (인장하중에 따른 Carbon/Carbon복합재의 진동특성)

  • Oh, Seung-Gyu;Kwac, Lee-Ku;Kim, Hong-Gun
    • Journal of The Korean Society of Manufacturing Technology Engineers
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    • v.20 no.6
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    • pp.740-744
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    • 2011
  • Carbon-carbon composite material is the reinforced carbon fiber. Because of its high strength, elasticity and the excellent heat-resisting property in high temperature, carbon-carbon composite material has been used in many fields such as aerospace and automotive industries, etc. Especially, aircraft brake discs used at aerospace can be cracked due to its fatigue and vibration under various loading condition. This research is focused on the influence of the vibration of carbon-carbon composite material by using accelerometer with impact hammer excitation. And the change of vibration mode will be known by applying tensile loading test.

Characteristics Correlations Between Fiber-Reinforced and Interfacial Adhesion in Carbon fiber reinforced Cement composite Prepared by Slurry Method. (슬러리법에 의한 탄소섬유보강 시멘트복합체의 제조에서 보강섬유와 계면결착제와의 상관특성)

  • Choi, Eung-Kyoo
    • Journal of the Korea Institute of Building Construction
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    • v.2 no.3
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    • pp.131-138
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    • 2002
  • The objective of the study is to examine the characteristic correlations between reinforcing carbon fiber and interfacial adhesion agent since the interfacial adhesion strength between reinforcing carbon fiber and matrices is believed to be an essential element influencing the physical properties in carbon fiber reinforced cement composite using slurry method. The integrity of interfacial adhesion between reinforcing fiber and cement not only affects the quality of fiber reinforced cement composite but also influences to a large degree the physical properties of the cement composite when producing carbon fiber reinforced cement composite using slurry method. Having analyzed the physical properties 1.e., water content, tensile strength, flexural strength and flexural toughness of carbon fiber reinforced cement composite specimens, C-PAM(cation polyacrylamide) was determined to be an optimum interfacial adhesion agent. The study has also demonstrated that interfacial adhesion strength varies largely on the content and type of the reinforcing fiber. Judging from magnified view of the tensile shear cross-section using VMS(video microscope system), interfacial adhesion strength between reinforcing fiber and matrices is affected by the type of interfacial adhesion agent. According to the result of the experiments, C-PAM was determined to be an ideal interfacial adhesion agent when using carbon fiber in producing carbon fiber reinforced cement composite with the optimum content of carbon fiber being established.

Cycling Performance of Supercapacitors Assembled with Polypyrrole/Multi-Walled Carbon Nanotube/Conductive Carbon Composite Electrodes

  • Paul, Santhosh;Kim, Jae-Hong;Kim, Dong-Won
    • Journal of Electrochemical Science and Technology
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    • v.2 no.2
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    • pp.91-96
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    • 2011
  • Polypyrrole (PPy)/multi-walled carbon nanotube (MWCNT)/conductive carbon (CC) composites are synthesized by the chemical oxidative polymerization method. The morphology analysis of the composite materials indicates uniform coating of PPy over MWCNTs and conductive carbon. The electrochemical performances of PPy/MWCNT/CC composites with different compositions are evaluated in order to optimize the composition of the composite electrode. Galvanostatic chargedischarge measurements and electrochemical impedance spectroscopy studies prove the excellent cycling stability of the PPy/MWCNT/CC composite electrodes.

Characterization of composite prepared with different mixing ratios of TiO2 to activated carbon and their photocatalytic activity

  • Chen, Ming-Liang;Bae, Jang-Soon;Ko, Young-Shin;Oh, Won-Chun
    • Analytical Science and Technology
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    • v.19 no.5
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    • pp.376-382
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    • 2006
  • In this work, pitch/activated carbon/$TiO_2$ composite were prepared by $CCl_4$ solvent method with different mixing ratios. The BET surface area of pitch/activated carbon/$TiO_2$ composite has a significantly increase with increasing activated carbon content in pitch/activated carbon/$TiO_2$ composite. The surface structure and elemental compositions of the composite were studied by SEM and EDX, respectively. The SEM results were presented to the characterization of porous texture on the pitch/activated carbon/$TiO_2$ composite. And EDX data was shown the presence of C, O, S, Ti and other elements. The structural properties of the composite were studied in XRD measurements. The $TiO_2$ crystal phases of the pitch/activated carbon/$TiO_2$ composite had lots of rutile-type structure which transforms from anatase-type with a little of anatase-type structure. The photocatalytic activities of the composite were evaluated using a photo-decomposition method under UV lamp. The pitch/activated carbon/$TiO_2$ composites were observed better photocatalytic activity than that of pristine $TiO_2$.