Preparation and Application of Fiber Composites made of Carbon Nanofibers and Carbide Nanofibers

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J. Korean Ceram. Soc. > Volume 37(6); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(6): 569.

나노탄소섬유와 나노카바이드섬유를 이용한 복합재의 제조와 활용에 관한 연구

임연수, 김기덕, 이재춘, 김명수, 김성수¹

명지대학교 세라믹·화학공학부
¹충북대학교 재료공학과

Preparation and Application of Fiber Composites made of Carbon Nanofibers and Carbide Nanofibers

ABSTRACT

Fabrication of carbon fiber reinforced composites was carried out by hand lay-up method. Carbon nanofibers and SiC nanofibers were used as filler in the composites fabrication. Carbon nanofibers, one of the new carbon materials, have 5∼500 nm in diameter and 5-10 nm in length. SiC nanofibers were modified by silicon monoxide vapor with carbon nanofibers. The composites were carbonized at 1000$^{circ}C$ in a nitrogen atmosphere, and then densified by molten pitches impregnated in vacuum. Multiple cycles of liquid pitch impregnation and carbonization were carried out to obtain a desired density. The composites were characterized by density, microstructure. The inter-laminar shear strength (ILSS) test was performed for mechanical properties. For the new application, the microwave reflective proeprty of composites was investigated. Dielectric constant and permeability spectrum were measured in 12∼18 GHz frequency ranges. On the basis of the wave propagation theory in a lossy media, the reflection loss from the composite inter-layer was predict as a function of frequency.

Key words: Carbon nanofibers, Silicon carbide nanofibers, Carbon fibers, Fiber reinforced composites, Electromagnetic waves