다공질유리의 탄소 열적환원반응에 의한 Sialon의 합성에 관한 연구

Synthesis of Sialon by Carbothermal Reduction of Porous Glass

  • 김병호 (고려대학교 공과대학 재료공학과) ;
  • 이덕열 (고려대학교 공과대학 재료공학과) ;
  • 김왕섭 (삼성종합기술원) ;
  • 전형우 (한국과학기술원) ;
  • 이근헌 (한국유리기술연구소)
  • 발행 : 1989.06.01

초록

Synthesis of $\beta$-Sialon powder was attempted with carbothermal reduction of porous glass. The porous glass was prepared by heat and hydrothermal treatments of 9.32 Li2O.46.5B2O3.37.2SiO2.6.98Al2O3 glass. Carbon pyrolyzed from propane gas was deposited on the porous glass, thereafter activated carbon was added as reducing agents. The synthesized $\beta$-Sialon powder was pressureless sintered at 175$0^{\circ}C$ for 1hr in N2 atmosphere. The characterization of the $\beta$-Sialon powder was performed with XRD, BET, SEM and particle size analysis. The sinterability and mechanical properties of the sintered bodies were investigated in terms of bulk density, M.O.R., fracture toughness, morphology of microstructure and etc. The reduction effect of deposited carbon was better than that of activated carbon mechanically added. The formation of SiC was precominant over that of Si2ON2 and $\beta$-Sialon owing to low partial pressure of N2 inside the pore, wehreas on the surface of porous glass the formation of Si2ON2 and $\beta$-Sialon were predominant. Thereafter, SiC reduced unreacted glass to be $\beta$-Sialon. Single phase of $\beta$-Sialon(Z=1.92) was obtained from PGA porous glass having the largest pore radius by the simultaneous reduction and nitridation method at 145$0^{\circ}C$ for 5hrs. The bulk density, M.O.R., and KIC of the sitered body are 3.17g/cc, 434.4MPa and 4.1MPa.m1/2, respectively.

키워드

참고문헌

  1. The Sialon-Properties W.J. Arral;J.J. Burke(ed.)
  2. J. Mat. Sci v.11 Sialon and Related Nitrogen Ceramics K.H. Jack
  3. Yogyo-Kyokai-Shi v.91 no.10 The Preparation of Sialon Powder from Kaolinite H. Yosuimatsu
  4. J. Am. Ceram. Soc. Comm v.67 β-Sialon from a Montmorillonite-Polyacrylonitrite Intercalation Compound by Carbothermal Reduction S. Yoshiyuki;K. Kuroda;C. Kato
  5. J. Am. Ceram. Soc. Bull. v.54 no.5 Materials Relation-Sintered from Volcanic Ash and Al Powders in N₂ S. Umebayashi;K. Kobayashi
  6. Yogyo-Kyokai-Shi v.93 no.7 Preparation of Sialon Powder from Alkoxides M. Mitomo;T. Shiogai;H. Yoshimatsu;Y. Kitami
  7. J. Kor. Ceram. Soc. v.26 no.2 Synthesis of Powder of the System Si-Al-O-N from Alkoxides H.L. Lee;M.C. Chun
  8. JANAF Thermochemical Tables(2nd Ed.) D.R. Stull;H. Prophet
  9. Metallurgical Thermochemistry(5th Ed.) O. Kubaschewski;C.B. Alcock
  10. Introduction to Metallurgical Thermodynamics(2nd Ed.) D.R. Gaskell
  11. Master Thesis, Korea Univ. Effect of Al₂O₃ on Cation Exchange Capacity of Porous Glass in Li₂O-B₂O₃-SiO₂ System K.N. Kim
  12. Master Thesis, Korea Univ. Synthesis of High Temp. Structural Ceramics in System Si-Al-O-C-N from Porous Glass W.S. Kim
  13. J. Am. Ceram. Soc. v.59 no.7 Fracture Thoughness Determination by Indentation A.G. Evans;E.A. Charies
  14. 粉體一理論と應用 (改定 二版) 久保輝一郞;神保元二;水渡英二;高橋浩;早川宗八郞
  15. Special Ceramics v.7 The Preparation of Silicon Nitride from Silica by Sol-Gel Processing A. Szweda;A. Hendry;K.H. Jack;P. Popper(ed.)
  16. J. Kor. Ceram. Soc. v.23 no.1 Synthesis of SiC and Sic-Si₃N₄ Powder from Jecheon Quartz H.L. Lee;C.H. Pai;J.H. Moon
  17. Special Ceramics v.6 The Preparation of Silicon Nitride from Silica A. Hendry;K.H. Jack;P. Popper(ed.)
  18. J. Matls. Sci. Lett. v.10 Synthesis of the α form of Silicon Nitride from Silica K. Komeya