Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Characteristics of SiC Whisker-Reinforced LAS Matrix Composites Fabricated by the Mixed Colloidal Route and the Sol-Gel Process

콜로이드 혼합법 및 Sol-Gel 법에 의해 제조한 SiC 휘스커 강화 LAS 기지 복합체의 특성

  • 김광수 (전남대학교 공과대학 무기재료 공학과) ;
  • 장현명 (포항공과대학 재료공학과 정밀 세라믹스 공정과학 연구실) ;
  • 정창주 (전남대학교 공과대학 무기재료 공학과) ;
  • 백용기 (국방과학 연구소 소재 개발부 소재 2실)
  • Published : 1991.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

SiC whisker-reinforced LAS matrix composites were developed by a mixed colloidal processing route. An optimization of processing conditions was made using the zeta potential data of silica, boehmite, and SiC whisker dispersions. Similarly, the SiC whisker-reinforced composites were also fabricated by the conventional sol-gel process using the hydrolysis-condensation reaction of relevant metal alkoxides. The composites fabricated by the mixed colloidal processing route were characterized by a uniform spatial distribution of SiC whisker throughout the matrix. The fracture toughness increased from 1.3 MPa.m1/2 for the LAS specimen to 5.0 Mpa.m1/2 for the hot-pressed composite (95$0^{\circ}C$ and 20 MPa for 20 min) containing 20 wt% SiC whisker. The increase in fracture toughness appears to result mainly from the crack deflection and the crack bridging by whiskers with some additional toughenings from the whisker pullout and the matrix prestressing mechanisms.

Keywords

References

  1. Ceram. Eng. Sci. Proc. v.2 no.7-8 Mechanisms of Toughening in Ceramic Matrix Composites R.W. Rice
  2. J. Am. Ceram. Soc v.73 no.2 Perspective on the Development of High-Toughness Ceramics A.G. Evans
  3. J. Mater. Sci. v.9 Interfacial Bonding and the Toughness of Carbon Fiber Reinforced Glass-Ceramics D.C. Philips
  4. J. Mat. Sci. v.15 High-Strength Silicon Carbide Fibre-Reinforced Glass-Matrix Composites K.M. Prewo;J.J. Brennan
  5. J. Kor. Ceram. Soc. v.28 no.5 Phase Formation and Rheological Characteristics of LAS Derived from the Monophasic Sol-Gel Route H.M. Jang;K.S. Kim;C.J. Jung
  6. Introduction to Organic Chemistry(2nd ed.) A. Streitwieser, Jr.;C.H. Heathcock
  7. J. Colloid Interf. Sci. v.22 Calculation of the Electrophoretic Mobility of a Spherical Colloid Particle P.H. Wiersema;A.L. Loeb;J. Th. G. Overbeek
  8. J. Mater. Sci. v.10 Equilibrium Penny-like Cracks in Identation Fracture B.R. Lawn;E.R. Fuller
  9. J. Kor. Ceram. Soc. Densification and Crystallization Characteristics of LAS Gels derived from the Hydrolysis/Condensation Reaction and the Mixed Colloidal Processing Route K.S. Kim;H.M. Jang;C.J. Jung
  10. J. Am. Ceram. Soc. v.72 no.10 Sinterable β-spondumene Glass-Ceramics S. Knickbocker;M.R. Tuzzolo;S. Lawhorne
  11. Bull. Ceram. Soc. Japan v.21 no.7 Toughening of Ceramic Materials by Whiskers S. Inoue;T. Uchiyama;K. Nihara
  12. Am. Ceram. Soc. Bull. v.67 no.2 Processing and Mechanical Properties of SiC-Whisker-Al₂O₃-Matrix Composites J. Homeny;W.L. Vaughn;M.K. Ferber
  13. Am. Ceram. Soc. Bull. v.65 no.2 Fiber Reinforced Glass-Ceramics for High Performance Applications K.M. Prewo;J.J. Brennan;G.K. Layden