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저전력 및 고효율 면상발열체를 위한 피치기반 탄소종이 제조 및 특성
양재연,윤동호,김병석,서민강 한국복합재료학회 2018 Composites research Vol.31 No.6
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 125.01oC(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 미치는영향을 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 125.01oC로 발열 특성을 나타내었다. 이러한 결과는 탄소섬유 사이에 존재하는 미세공극이 채워짐으로써, 전기적 네트워크가 형성되어 전기적 및 열적특성이 향상되었기 때문이다.
Preparation of high conductive carbon sheet for surface heating element
양재연,김병석,황지영,서민강 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In this work, in order to give high efficiency heating element to korean paper(hanji)board used in traditional korean house, carbon sheet with conductive carbon materials was made and conductivity was given and then laminating process was applied. The smart system was applied to the developed thermal paperboard, and finally developed the carbon sheet paperboard which can control the temperature. conductive carbon materials, such as petroleum coke, graphite and phenolic resin, were used to improve electrical and thermal properties by impregnating of carbon sheet preform for surface-heater. The influence of conductive carbon materials on physicochemical properties of carbon sheet were investigated. Electrical properties, thermal conductivity, and tensile strength of carbon sheet was measured.
Densification process of carbon/carbon composites by melted petroleum pitch impregnation
양재연,최웅기,곽이구,국윤수,서민강 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
In this work, unidirectional carbon/carbon (C/C) composites with PAN-based carbon fibers as a reinforcement and phenolic and petroleum pitch resins as matrix precursors were densified by melted petroleum pitch impregnation and recarbonization. The effect of densification cycles of melted petroleum pitch impregnation was investigated. The efficiency of the impregnation process of the composites were observed by bulk density, open porosity. And the oxidation behaviors of the composites with densification cycles were investigated at 600-1000°C in an air environment. The mechanical properties and fracture behaviors of the composites were studied using the three-point short-beam test according to interlaminar shear strength and flexural tests. Relationships between the densification cycles and the brittle behaviors of the composites were also investigated.
Rapid stabilization of polyacrylonitrile-based carbon webs modified by ozone treatment
양재연,고재경,서민강 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Oxidative stabilization of PAN-based carbon webs were required to improve quality during the manufacturing process. Also, the oxidative stabilization process played a major role such as various reactions of the cyclization and intramolecular crosslinking. Recently, many efforts had been made to optimize the time and temperature profile of oxidative stabilization process. In this study, the oxidative stabilization process and microstructures of ozone-treated PAN-based webs were investigated. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Raman spectroscopy, X-ray diffractomete (XRD), and scanning electron microscope (SEM) measurements were performed to characterize the stabilized fibers and carbon fibers.
양재연,고재경,서민강 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Oxidative stabilization and carbonization processes were used to prepare polyacrylonitrile(PAN)-based carbon webs. The oxidative stabilization of PAN-based webs were tried at various temperatures. The effect of oxidative stabilization on the physical properties and microstructure of the final carbon webs were reported in this study. In the present study, PAN-based webs processed under different heat-treatment temperatures of oxidative stabilization were investigated for elemental analysis(EA), fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), thermogravimentric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscopy (SEM).