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2016 Vol.26, Issue 6 Preview Page
Preparation of Porous SiC by Freeze Drying of Polycarbosilane Emulsion

폴리카보실란 에멀젼의 동결건조를 이용한 다공체 SiC 제조

Yeon Hwang†
황 연†
Department of Materials Science & Engineering, Seoul National University of Science & Technology, Seoul 01811, Republic of Korea
서울과학기술대학교 신소재공학과
†Corresponding author yhwang@seoultech.ac.kr (Y. Hwang, Seoul Nat’l Univ. Sci. Technol.)
June 2016. pp. 320-324
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Abstract

Porous SiC beads were prepared by freeze-drying a polycarbosilane (PCS) emulsion. The water-in-oil (w/o) emulsion, which was composed of water, PCS dissolved p-xylene, and sodium xylenesulfonate (SXS) as an emulsifier, was frozen by dropping it onto a liquid N2 bath; this process resulted in 1~2 mm sized beads. Beads were cured at 200 °C for 1 h in air and heat-treated at 800 °C and 1400 °C for 1 h in an Ar gas flow. Two types of pores, lamella-shaped and spherical pores, were observed. Lamellar-shaped pores were found to develop during the freezing of the xylene solvent. Water droplets in the w/o emulsion were changed into spherical pores under freeze-drying. At 1400 °C of heat-treatment, porous SiC was synthesized with a low level of impurities.

Keywords
polycarbosilane
porous SiC
freeze-drying
polymer emulsion
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Information
  • Publisher :Materials Research Society of Korea
  • Publisher(Ko) :한국재료학회
  • Journal Title :Korean Journal of Materials Research
  • Journal Title(Ko) :한국재료학회지
  • Volume : 26
  • No :6
  • Pages :320-324
  • Received Date : 2016-01-06
  • Revised Date : 2016-04-27
  • Accepted Date : 2016-04-27
  • DOI :https://doi.org/10.3740/MRSK.2016.26.6.320
Journal Informaiton Korean Journal of Materials Research Korean Journal of Materials Research
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