유연한 탄화규소 섬유 로프 발열체의 제조와 저항 발열 특성
Fabrication and resistance heating properties of flexible SiC fiber rope as heating elements
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초록
고분자로부터 제조되는 탄화규소 섬유는 고온 내산화성, 인장강도, 그리고 경량성 때문에 세라믹 복합체의 강화재료로 주로 적용되고 있다. 본 연구에서 탄화규소 연속섬유는 유연한 로프 형태의 고온 발열체(> 650℃)로 제조하기 위해사용되었다. 특히, 탄화규소 섬유 발열체는 고효율의 저항 발열을 위해 단면적과 길이에 대한 저항 변화를 2-point probe 방법으로 측정하고, 비정질 탄화규소 섬유에 존재하는 산소 불순물과 결정립의 크기 제어를 통해 로프형 섬유 발열체의 저항값을 최적화하였다. 그 결과, 약 100~200Ω의 저항 범위를 가지는 탄화규소 섬유 발열체는 탄소 섬유 발열체보다 1.5배의우수한 소비전력 효율을 가졌다.
Abstract
Silicon carbide (SiC) fibers mainly fabricated from polycarbosilane, a ceramic precursor, are applied as reinforcingmaterials for ceramic matrix composites (CMCs) because of their high temperature oxidation resistance, tensile strength, andlight weight. In this study, continuous SiC fibers used to fabricate rope-type flexible heating elements capable of generatinghigh-temperature heat (> 650℃). For high-efficiency heating elements, the resistance of SiC fiber rope was measured by 2-point probe method according to the cross-sectional area and length. In addition, the fabrication conditions of rope-type SiCfiber heating elements were optimized by controlling the oxygen impurities and the size of crystal grains present in theamorphous SiC fiber. As a result, the SiC fiber heating element having a resistance range of about 100~200 Ω exhibited anexcellent power consumption efficiency of 1.5 times compared to that of the carbon fiber heating element.
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