Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Preparation and Characterization of Pitch-based Carbon Paper for Low Energy and High Efficiency Surface Heating Elements

저전력 및 고효율 면상발열체를 위한 피치기반 탄소종이 제조 및 특성

  • Yang, Jae-Yeon (Department of Organic Materials and Fiber Engineering, Chonbuk National University) ;
  • Yoon, Dong-Ho (R&D Center, KUK IL Paper MFG. Co., Ltd.) ;
  • Kim, Byoung-Suhk (Department of Organic Materials and Fiber Engineering, Chonbuk National University) ;
  • Seo, Min-Kang (Korea Institute of Carbon Convergence Technology)
  • Received : 2018.07.31
  • Accepted : 2018.11.01
  • Published : 2018.12.31
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Abstract

In this work, phenolic resins containing conductive carbon fillers, such as, petroleum coke, carbon black, and graphite, were used to improve the surface heating elements by impregnating a pitch-based carbon paper. The influence of conductive carbon fillers on physicochemical properties of the carbon paper was investigated through electrical resistance measurement and thermal analysis. As a result, the surface resistance and interfacial contact resistivity of the carbon paper were decreased linearly by impregnating the carbon fillers with phenol resins. The increase of carbon filler contents led to the improvement of electrical and thermal conductivity of the carbon paper. Also, the heating characteristics of the surface heating element were examined through the applied voltage of 1~5 V. With the applied voltage, it was confirmed that the surface heating element exhibited a maximum heating characteristic of about $125.01^{\circ}C$(5 V). These results were attributed to the formation of electrical networks by filled micropore between the carbon fibers, which led to the improvement of electrical and thermal properties of the carbon paper.

본 연구에서는 면상발열체 특성을 향상시키기 위해 피치계 탄소종이에 전도성 탄소필러로 석유계 코크스, 카본블랙, 흑연을 페놀수지와 함께 함침시켰으며, 탄소종이에 함침된 탄소필러가 물리화학적 성질에 미치는 영향을 전기적, 열적 특성 분석을 통해 고찰하였다. 그 결과, 면저항과 계면접촉저항이 선형적으로 감소하였으며, 탄소필러의 함량이 증가함으로써 전기전도도와 열전도도가 향상하였다. 또한, 탄소종이에 1~5 V 전압을 인가하였을 경우 탄소종이의 면상발열 특성을 관찰하였을 때 5 V 전압에서 최대 $125.01^{\circ}C$로 발열 특성을 나타내었다. 이러한 결과는 탄소섬유 사이에 존재하는 미세공극이 채워짐으로써, 전기적 네트워크가 형성되어 전기적 및 열적 특성이 향상되었기 때문이다.

Keywords

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Fig. 1. Schematic of manufacturing process of the carbon paper with phenol resins and carbon fillers

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Fig. 2. Schematic diagram of the test for interfacial contact resistance

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Fig. 3. Density of pitch-based carbon paper with phenol resins and carbon filler contents

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Fig. 4. Morphologies of pitch-based carbon paper with phenol resins and carbon filler contents

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Fig. 5. XRD patterns of pitch-based carbon paper with phenol resins and carbon filler contents

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Fig. 6. Tensile strength of pitch-based carbon paper with phenol resins and carbon filler contents

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Fig. 7. Electrical properties of pitch-based carbon paper with phenol resins and carbon filler contents; (a) surface resistance and (b) electrical conductivity

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Fig. 8. Interfacial contact resistivity of pitch-based carbon paper with phenol resins and carbon filler contents

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Fig. 9. Thermal conductivity of pitch-based carbon paper with phenol resins and carbon filler contents

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Fig. 10. Thermo-graphic camera images of pitch-based carbon paper with phenol resins and carbon filler contents according to applied voltages of 5 V

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Fig. 11. Time-dependent temperature changes of carbon paper at applied voltages of 5 V

Table 1. Experimental Names of the Samples

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Table 2. Properties of pitch-based carbon paper with phenol resins and carbon filler contents

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Table 3. Heating temperature of pitch-based carbon paper with phenol resins and carbon filler contents

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