• A Study on the Synthesis and Pyrolytic Properties of SiC/Ti Hybrid Ceramic Precursor by Hydrolysis
  • Hwang TS, Lee JT, Woo HG
  • 가수분해에 의한 탄화규소/티타늄 혼성 세라믹 전구체 합성과 열분해 특성에 관한 연구
  • 황택성, 이존태, 우희권
Abstract
In order to increase the thermal stability at high temperatures, new hybrid ceramic percursors were synthesized by chemical modification of polycarbosilane (PCS). The structure of hybrid ceramic percursors were investigated by using FT-IR and 1H-NMR spectrometers. The syntheses of hybrid ceramic precursors were confirmed by monitoring the change of the adsorption peaks appearing at 2893, 1092, 609 cm-1 on the FT-IR spectra, and also by the presence of peaks at 3.8, 2.0, 0.6 ppm on the 1H-NMR spectra. The conversion of hybrid ceramic percursor was around 74 and 10 wt% higher than that of the pure PCS. After the heat-treatment at 1500 ℃, the crystalline peaks for β-SiC were observed at 2θ= 35.7, 42.2, 61.0 ° on the X-ray powder diffractogram. It showed the conversion of hybrid ceramic percursor to crystalline β-SiC.

고온에서 열적 안정성이 우수한 hydrid 세라믹 전구체를 합성하기 위하여 polycarbosilane(PCS)의 화학적 개질에 의해 Si-O-Ti-C 구조를 갖는 세라믹 전구체를 합성하였다. 합성한 공중합체의 FT-IR 스펙트럼 결과 2893, 1092, 609 cm-1 부근에서 피크변화를 나타났으며, 1H-NMR 스펙트럼의 δ=3.8, 2.0, 0.6ppm 부근에서 특성피크가 나타나는 것을 확인함으로써 전구체 합성을 확인하였다. 초기 열분해 온도와 열분해 전환율 별화를 알아보기 휘한 열중량 분석 (TGA)결과 열분해 초기 온도가 300℃로 낮아졌으며 열분해 전환율도 74wt%로 순수한 PCS에비해 10wt%가 증가함을 보였다. 또한 1500℃까지 열분해시킨 후 X-선 회절분석 결과 2θ=35.7, 42.2, 61.0°에서 결정성 피크로 β-SiC의 전환을 확인하였다.

Keywords: Polycarbosilane; Allylchlorodimethylsilane; Titanium(IV) butoxide; Hydrolysis; Hydrosilylation

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2024 Impact Factor : 0.6
  • Indexed in SCIE

This Article

  • 2000; 24(3): 299-305

    Published online May 25, 2000