Effect of SiC Particles Size on the Densification of $Al_2O_3-SiC$ Composite During Pressureless Sintering

$Al_2O_3-SiC$ 복합재료의 상압소결시 치밀화에 미치는 SiC 원료분말의 크기영향

  • 채기웅 (호서대학교 신소재기계공학부)
  • Published : 1999.11.01

Abstract

Effect of SiC particle size of the densification of Al2O3-SiC composite during pressureless sintering was investigated. Two types of SiC powders having average particle size of 0.15${\mu}{\textrm}{m}$ and 3${\mu}{\textrm}{m}$ were used. Densification rate of the specimen containing 0.15${\mu}{\textrm}{m}$ SiC particles was slower than that of the specimen containg 3${\mu}{\textrm}{m}$ SiC particles. Although the relative density of the specimen containing 0.15${\mu}{\textrm}{m}$ SiC particles was below 90% of theoretical density after sintering at 155$0^{\circ}C$ the complete closure of open pores occurred. Therefore full densification could be obtained by subsequent HIP. On the other hand in the specimen containing 3${\mu}{\textrm}{m}$ SiC particles the complete closed pore was observed at 95% of theoretical density. Such a fast pore closure in the specimen containing 0.15${\mu}{\textrm}{m}$ SiC particles is likely to occur as a result of dense reaction layer formation on the specimen surface which is attributed to the high reactivity of small size particles with sintering atmosphere.

References

  1. Adv Ceram. Mater. v.3 no.2 Temperature Dependence of Strengthening by Whisker Reinforcement : SiC Whisker Reinforced Alumina in Air P.F. Becher;T.N.Tiegs
  2. J. Am. Ceram. Soc. v.73 no.4 Oxidation of Silicon Carbide-Reinforced Oxide-Matrix Composites at 1375 to 1575℃ K.L. Luthra;H.D. Park
  3. J. Am. Ceram. Soc. v.67 no.12 Toughening Behavior in SiC-Whisker Reinforced Alumina P.F. Becher;G.C. Wei
  4. J. Am. Ceram. Soc. v.74 no.6 Corrosion and Strength of SiC-Whisker-Reinforced Alumina exposed at High Temperatures to H₂-H₂O Atmospheres H.E. Kim;A.J. Moorhead
  5. J. Am. Ceram. Soc. v.73 no.7 Effect of Active Oxidation on the flexural Strength of Sintered-SiC H.E. Kim;A.J. Moorhead
  6. J. Mat. Sci. Micro-srtucture and Properties of Alumina-Silicon Carbide Nanocomposites Fabricated by Pressureless Sintering and Post Hot-Isostatic Pressing Y.K. Jeong;A.N. Nakahira;K. Niihara
  7. J. Am. Ceram. Soc. v.76 no.2 Mechanical Behavior of Alumina-Silicon Carbide Nanocomposites J. Zhao;L. Stearns;M.P. Hamer;H.M. Chan;G.A. Miller
  8. J. Eur. Ceram. Soc. v.10 no.433-477 Processing and Microstructure Development in Al₂O₃-SiC Nano-composites L.C. Stearns;J. Zhao;M.P. Harmer
  9. J. Am. Ceram. Soc. v.78 no.3 Crack Healing and Stress Relaxation in Al₂O₃-SiC Nano-composite A.M. Thompson;H.M. Chan;M.P. Harmet
  10. J. Mater. Sci . v.13 no.2003-2012 Strength Improvement of Cemented Carbides by Hot Isostatic Pressing U. Engel;H. Hubner
  11. Ceram. Int. v.14 no.191-194 Effect of Pretreatment Sintering Temperature on the Densification of Al₂O₃ and Al₂O₃-ZrO₂ Ceramics by Sinter plus HIP J.W. Min;D.Y. Kim
  12. J. Ceram. Soc. Jpn. v.99 New Design Concept of Structural Ceramic-Ceramic Nanocomposites K. Niihara;A. Nakahira
  13. Proc 3rd Int. symp. on Ceramic Materials and Components for Enginers Strengthening of Oxide Ceramics by SiC and Si₃N₄ Dispersion K. Niihara;A. Nakahita;V.J. Tennery(ed.)
  14. J. Eur. Ceram. Soc. v.17 no.1061-1082 Review. Structural Ceramic Nanocomposites M. Sternitzke
  15. J. Ceram. Jpn. v.100 no.4 Effect of atmosphere on Microstructural Evolution of Pressureless Sintered Al₂O₃/SiC Composite M.I. Nieto;P. Miranzo;S. de Aza;J.S. Moya
  16. J. Am. Ceram. Soc. Desification Behavior of Fine SiC Dispersed Al₂O₃ Composite by Sinter plus HIP K.W. Chae
  17. J. Am. Ceram. Soc. v.76 no.7 Effect of Y₂O₃ Additions on the Densification of an Al₂O₃-TiC Composite K.W. Chae;D.Y. Kim;B.C. Kim;K.B. Kim