• Title, Summary, Keyword: Composites

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New Application of Clay Filler for Carbon/Carbon Composites and Improvement of Filler Effect by Clay Size Reduction

  • Jeong, Eui-Gyung;Kim, Jin-Hoon;Lee, Young-Seak
    • Carbon letters
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    • v.11 no.4
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    • pp.293-297
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    • 2010
  • To investigate new potential application of a clay material for C/C composites, illite added C/C composites were prepared with various illite contents. The improvement of filler effect by illite size reduction was also investigated using wet ballmilling by evaluating illite/phenolic resin infiltration using bulk density and porosity measurements, chemical structural changes of the composites using XRD, and thermal oxidation stability in air of the composites using TGA. The size reduction of illite resulted in narrower particle size distribution and improved illite infiltration into carbon preform. And the resultant C/C composites prepared with illite had even more improved thermal oxidation stability in air, showing more increased IDTs up to $100^{\circ}C$, compared to those of the C/C composites with pristine illite, due to the SiC formation through carbothermal reduction between illite and carbon materials. The illite induced delay in oxidation of the illite-C/C composites was also observed and the delayed oxidation behavior was attributed to the layered structure of illite, which improved illite/phenol resin infiltration. Therefore, the potential use of illite as filler to improve oxidation stability of C/C composite can be promising. And the size reduction of illite can improve its effect on the desired properties of illite-C/C composites even more.

The Effect of Moisture Absorption and Gel-coating Process on the Mechanical Properties of the Basalt Fiber Reinforced Composite

  • Kim, Yun-Hae;Park, Jun-Mu;Yoon, Sung-Won;Lee, Jin-Woo;Jung, Min-Kyo;Murakami, Ri-Ichi
    • International Journal of Ocean System Engineering
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    • v.1 no.3
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    • pp.148-154
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    • 2011
  • Generally, strength degradation is caused by the absorption of moisture in composites. For this reason, a fracture is generated in the composites and traces of glass fiber degrade human health and physical damage is generated. Therefore, in this research, we studied the mechanical properties change of composites by moistureabsorption. The composites were manufactured with and without the Gel-coating process and were immersed in a moisture absorption device at $80^{\circ}C$ for more than 100 days. The mechanical properties of the moistureabsorption composites and the composites which dry after moisture-absorption were compared. The mechanical properties degradation of basalt fiber composites according to the result of the measurement of moistureabsorption was smaller than that of glass fiber composites by about 20%. In addition, the coefficient of moisture absorption was lower for the case of Gel-coating processing than the composites without the Gel-coating process by about 2% and it was deduced that Gel-coating did not have a significant effect on the mechanical properties.

Tensile Strength of Composites from Hanji(Korean paper) Sludge Mixed with Wood Fiber or Pariticle (한지 슬러시-목재 섬유 또는 목재 파티클 복합재의 인장강도)

  • 이필우;손정일;이영규
    • Journal of the Korea Furniture Society
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    • v.10 no.1
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    • pp.51-56
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    • 1999
  • This research was carried out to investigate the Hanji sludge(black color)-wood fiber and wood particle composited applied by waste sludges arising from the making process of Hanji (Korea paper). In experimental design, four levels of the mixed ratio of Hanji sludge to wood fiber or wood particle(10:90, 20:80, 30:70 and 40:60), three kinds of the resin(PMDI, urea and phenol resin)and three kinds of the specific gravity(0.6, 0.75 and 0.9) were designed to determine the tensile strength of Hanji sludge-wood fiber and wood particle composites. From the results and discussion, it may be concluded as follows: In Hanji sludge-wood fiber and wood particle composites, tensile strengths showed decreasing tendency absolutely by increasing Hanji sludge additive, but clearly increase with the increase of specific gravity. In Hanji sludge-wood fiber composites, there were no differences between PMDI and urea resin-bonded composites, but phenol resin-boned composites were made possibly until the addition of 30% Hanji sludge. On the other hand, Hnji sludge-wood particle composites(SpGr=0.6) have very low tensile strength values. But they were made favorably until the addition of 20% Hanji sludge in Hanji sludge-wood particle composites(SpGr=0.9).

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Generation of high field emission current from carbon nanotubes

  • Lim, Seong-Chu;Heong, Hee-Jin;Choi, Ha-Kyu;Song, Young-Il;Kim, Gil-Yong;Lee, Young-Hee
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.1020-1022
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    • 2005
  • We have fabricated a high electron source from carbon nanotubes (CNTs) using hot-press method. Using hot-press method, we are able to control the tube density and the morphology of CNT films. We propose that the high emission current is due to the solid adhesion between the CNTs and substrates and uniform morphology of CNT film.

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Field emission properties of expanded graphite composite

  • Alegaonkar, P.S.;Park, J.H.;Jeon, S.Y.;Shin, J.H.;Berdinsky, A.S.;Yoo, J.B.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.775-777
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    • 2007
  • Field emission properties of expanded graphite composite have been studied. Composite has been synthesized via shear mixing expanded graphite in ${\alpha}-terpineol$ and ethyl cellulose. Field emission properties, of screen printed composite has been measured at a static applied electric field. The details of the analysis have been presented.

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Carbon nanotube based transparent electrodes for flexible displays using liquid crystal devices

  • Shin, Jun-Ho;Lee, H.C.;Lee, J.H.;Park, S.M.;Alegaonkar, P.S.;Yoo, J.B.
    • 한국정보디스플레이학회:학술대회논문집
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    • pp.897-899
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    • 2007
  • Transparent electrodes for a flexible display based on the liquid crystal (LC) were formed by carbon nanotubes (CNTs) on polyethylene terephthalate (PET) substrates. The thin multi wall carbon nanotubes (t-MWNTs) networks for electrodes were obtained by filtration- transfer method from welldispersed CNTs solution.

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