Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Thermal Decomposition of $\beta$$-Sialon by Graphite

이연에 의한 $\beta$$-사이알론의 열분해

  • 최상흘 (인하대학교 무기재료공학과) ;
  • 이희철 (인하대학교 화학공학과) ;
  • 이종진 (인하대학교 무기재료공학과) ;
  • 서규식 (인하대학교 무기재료공학과)
  • Published : 1987.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

β'-sialon(Z=2.7) specimens with <30%wt. graphite as a reducing agent were decomposed at 1350°up to 1,450℃ under the atmosphere of 90% N2-10%H2. The decomposition of β'-sialon was calculated from the change in Z-value, and the formation of new minerals was identified from X-ray diffraction patterns. The decomposition reactions of sialon were considered to yield a stable sialon close to β-silicon nitride and some aluminum compounds according to the following equations; β'-sialon(s)＋C(s)＋N2(g)→β2-sialon(metastable)＋β3-sialon(stalbe phase) β2-sialon(s)＋C(s)＋N2(g)→β3-sialon(s)＋AlN(s)＋α-Al2O3(s)＋15R(s)＋SiO(g)＋Al2O(g)＋CO(g) Z-value; β2( 3.5)>β'( 2.7)>β3( 0.5) The decomposition rate of sialon was controlled by two mechanisms ; One was characterized by the interface area of contact, corresponding to an apparent activation energy of 50.5Kcal/mol in the initial stage, and the other by the diffusion, corresponding to that of 104.3Kcal/mol in the final stage of the decomposition.

Keywords

References

  1. Trans. J. Brit. Ceram. v.72 Nitrogen Ceramics K.H. Jack
  2. The Sialons-Properties W.J. Arral;J.J. Burke(et al.)
  3. Trans. J. Brit. Ceram. Soc. v.81 The Development of Syalon Ceramics and their Engineering Applications N.E. Cother;P. Hodgson
  4. Yogyo-Kyokai-Shi v.82 no.7 Solid Solution in the System Si₃N₄-AlN-Al₂O₃ Y. Oyama
  5. J. Mat. Sci. v.11 no.6 Sialon and Related Ceramics K.H. Jack
  6. J. Mat. Sci. v.15 The Relation Hot-Pressing of Compositions in the System Al-Si-N-O Corresponding to β'-Sialon M. Kawabasra;M. Benn;F.L. Riley
  7. Comm. Am. Ceram. Soc. Formation of β-Si₃N₄ Solid Solution in the System Si₃N₄-AlN-Y₂O₃ Zhen-Kun Huang;Peater Greil;Gunter Petzow
  8. Yogyo-Kyokai-Shi v.80 no.8 Hot-Pressing of Si₃N₄-AlN-Y₂O₃ Y. Oyama;O. Kamigaito
  9. J. Am. Ceram. Soc. v.60 Fabrication of Reaction-Sintered Sialon R.R. Wills;R.W. Stewart;J.M. Wimmer
  10. J. Mat. Sci. v.14 Fabrication of High Strength β'-Sialon by Reaction Sintering M. Mitomo;N. Kuramoto;Y. Inomata
  11. J. Mat. Sci. v.16 Reaction Sintering and the α-Si₃N₄/β-Sialon Transformation for Compositions in the System Si-Al-O-N M.V. Rahaman;F.L. Riley;R.J. Brook
  12. Yogyo-Kyokai-Shi v.89 Sialon Formation by Shock Compression M. Mitomo;N. Setake;M. Tsutumi
  13. Am. Ceram. Soc. Bull. v.56 no.6 Direct Preparation of Dense Si-Al-O-N Composities from naturally occuring Silica and Al Power S. Umebayashi;K. Kobayashi
  14. Yogyo Kyokai-Shi v.91 no.10 Preparation of Sialon Powder from Kaolinite M. Mihashi;M. Mitomo
  15. Ceramic Powders Relevant Parameters in the Production of β'-Sialon from Natural Raw Materials via Carhothermic Reduction J.B. Baldo;V.C. Pandofelli;J.R. Casarini;Vincenzini(ed.)
  16. Yogyo-Kyokai-Shi v.88 no.1 Thermal Decomposition Reaction of Sialon M. Mitomo;N. Kuramoto;Y. Yajima
  17. J. Am. Ceram. Soc. v.58 Thermal Decomposition of Al₂O₃-Si₃N₄Mixture D.R. Messier;G.E. Gazzara
  18. J. Mat. Sci. Letters v.15 Thermal Decomposition of a Si₃N₄-22wt% Al₂O₃Alloys B.M. Ditchek;K.R. Breen;J.D. Venables
  19. Science of Ceramics v.12 Carbothermal Production of β'-sialon F.K. Van Dijen;C.A.M. Siskens;R. Metselar;P.Vincenzine(ed.)
  20. 요업학회지 v.23 no.5 카올린으로부터 組成이 다른 β'-sialon의 合成 崔相旭;徐奎植;李鍾珍
  21. 연세대학교대학권 석사논문 완도납석으로부터 β'-sialon의 合成 신현곤
  22. Elements of X-ray Diffraction(2nd) B.D. Cullity
  23. J. Am. Ceram. Soc. v.61 Insolubility of Mg in β-Si₃N₄in the System Al-Mg-Si-O-N L.J. Gauckler;J. Weiss;T.Y. Tien
  24. J. Mater. Sci. v.16 Calculation of Heterogeneous Phase Equilibria in the SiAlON System P. Dorne;L.J. Gauckler;H. Krieg;H. L. Lucas;G. Petzo;J. Weiss
  25. J. Am. Ceram. Soc. v.67 no.9 Thermal Decomposition in the System Si-Y-Al-O-N D.R. Messier;E.J. Deguire
  26. Nitrogen Ceramics A Simple Thermochemical Model for the Si-Al-O-N System J.P. Torre;A. Mocellin