• Composites Research
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• 제30권2호
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• pp.102-107
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• 2017

프리세라믹폴리머는 기존의 세라믹 공정으로는 얻을 수 없는 다양하고 복잡한 구조의 세라믹 소재를 구현할 수 있다. 대표적인 프리세라믹폴리머인 폴리카보실란은 분자구조 제어를 통해 실리콘과 탄소의 함량비 조절이나 분자구조의 선형성을 향상시키고 분자량 및 분자량분포 제어를 통해 탄화규소섬유를 포함한 다앙한 형상/미세구조의 탄화규소 세라믹을 제조할 수 있다. 본 논문에서는 폴리카보실란의 합성 및 분자구조제어기술과 이를 용융방사 및 안정화, 열처리를 거쳐 제조되는 탄화규소섬유섬유, 그리고 PIP 공정으로 만들어지는 세라믹섬유복합소재 기술에 대하여 논하였다. 더불어 나노다공구조를 갖는 탄화규소 중공사와 같이 폴리카보실란을 이용해 구현할 수 있는 복잡구조의 탄화규소 소재 개발 예를 소개하였다.

• 한국세라믹학회지
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• 제50권4호
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• pp.301-307
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• 2013

SiC hollow fiber was fabricated by curing, dissolution and sintering of Al-PCS fiber, which was melt spun the polyaluminocarbosilane. Al-PCS fiber was thermally oxidized and dissolved in toluene to remove the unoxidized area, the core of the cured fiber. The wall thickness ($t_{wall}$) of Al-PCS fiber was monotonically increased with an increasing oxidation curing time. The Al-PCS hollow fiber was heat-treated at the temperature between 1200 and $2000^{\circ}C$ to make a SiC hollow fibers having porous structure on the fiber wall. The pore size of the fiber wall was increased with the sintering temperature due to the decomposition of the amorphous $SiC_xO_y$ matrix and the growth of ${\beta}$-SiC in the matrix. At $1400^{\circ}C$, a nano porous wall with a high specific surface area was obtained. However, nano pores grew with the grain growth after the thermal decomposition of the amorphous matrix. This type of SiC hollow fibers are expected to be used as a substrate for a gas separation membrane.

• The Korean Journal of Ceramics
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• 제4권4호
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• pp.382-386
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• 1998

titanate and a silicon carbide/zirconium diboride particulate composite have each been blended with thermoplastic of aqueous binders and extruded. The green extrudates have diameters ranging between 50 and 150 ㎛ and polyethylene-base 150 ${\mu}m$ diameter fibers can be drawn down at elevated temperature to approximately 40 ${\mu}m$ diameter. Hollow fibers with 150${\mu}m$ outer and 90 ${\mu}m$ inner diameter can also be fabricated. Green fibers have been processed into chopped fiber felts for use as gas distributors/current collectors in an experimental solid oxide fuel cell (SOFC) and the first attempts at producing simple textile structures have been successful. The fibers, tubes and felts have been successfully debound and sintered and characterization of the sintered PSZ fibers, for example, has revealed a density in excess of 99% and tensile failure stresses up to 1.0 GPa for 78 ${\mu}m$ diameter fibers.