Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Isolated Pore Generation Mechanism and Mechanical Properties in MAS System with 3Y-TZP

MAS계에서 3Y-TZP 첨가에 따른 독립 기공 생성기구와 기계적 성질

  • 최성철 (한양대학교 공과대학 무기재료공학과) ;
  • 박현철 (한양대학교 공과대학 무기재료공학과)
  • Published : 1993.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

MAS system has narrow sintering temp. range due to the liquid phae sintering and thereby densify rapidly. And especially, its poor mechanical properties limitedthe industrial application. In this study, the improvement of mechanical properties and densification is suggested by the consideration of the toughening mechanisms and isolated pore generation mechanism which is derived by the liquid phase sintering theory in 3Y-TZP added composites. After Pressureless sintering up to 140$0^{\circ}C$ for 5hr, the dihedral angle and contact angle are analyzed by the observation of microstructure. As a result of microstructure analysis, the sintering stage of the specimen sintered for 5hr is analyzed as solid-skeleton stage. And the isolated pore generation mechanisms are considered as (1) The swelling of the liquid phase is predominent due to the facts that dihedral angle is larger than 60$^{\circ}$, contact angle is large and that liquid volume fraction is smaller than 10%. (2) The porous characteristics of the MAS system is also suggested as: the SiO2-rich liquid film is firstly formed at the srface and therefore this reduces the contiguity of the pore, which induces the isolated pore. The strength and fracture toughness increased with the addition of 3Y-TZP and the main fracture toughness improvement mechanisms are analyzed as the crack deflection.

Keywords

References

  1. KIST 세라믹스 재료 연구단 신소재 시장조사 중간 보고서 v.38 no.99-110
  2. J. Ceram. Soc. Japan v.95 no.2 Preparation of Cordierite Ceramics from Metal Alcoxide H. Suzuki;K. Ota;H. Saito
  3. Am. Ceram Soc. Bull. v.63 no.5 Preparation and Properties of Mullite-Cordierite Composites B.H. Mussler;M.W. Shafer
  4. J. Am. Ceram. Soc. v.73 no.3 Whisker Toughening:A Comparison between Aluminium Oxide and Silicon Nitride Toughened with Silicon Carbide Geoffrey H. Campbell;Manfred Ruhle;Brian J. Dalgloish;Anthony G. Evans
  5. Science & Technology of Zirconia Ⅱ, Advanes in Ceramics v.12 N. Claussen;N. Claussen(ed.);M. Ruhle(ed.);A. H. Heuer(ed.)
  6. J. Am. Ceram. Soc. v.55 no.6 Phase Analysis in Zirconia Systems R.C. Garvie;P.S. Nicholson
  7. J. Mat. Sci v.10 no.2016 Equilibrium Penny-like Cracks in Indentation Fracture B.R. Lawn;E.R. Fuller
  8. J. Am. Ceram. Soc. v.63 no.11-12 Thermal Expansion and Chemical Modifications of Cordierite D.L. Evans;G.R. Fisher;J.E. Geier;F.W. Martin
  9. J. Am. Ceram. Soc. v.64 no.245-248 Morphology and Stability of the Glass Phase in Glass-Ceramic Systems R. Raj
  10. Liquid Phase Sintering R.M. German
  11. Trans. TMS-AIM E v.197 Measureement of Particle Size in Opaque Bodies R.L. Fullman
  12. Liquid Phase Sintering R.M. German
  13. Introduction to Ceramics W.D. Kingery;H.K. Bowen;D R. Uhlman
  14. Acta Met. v.24 no.125-135 Geometry of Two-Phase Aggregates in which the Shape of the Second Phase is Determined by its Dihedral Angle P.J. Wray
  15. J. Phy. Chem. v.69 no.1238 The Occurrence of Metastable Tetragonal Zirconia as a Crystalline Size Effect R.C. Garvie
  16. Metall. Trans. v.15A Ostwald Ripening during Liquid Phase Sintering-Effect of Volume Fraction on Coarsening Kinetics P.W. Voorhees;M.E. Glicksman
  17. Science and Technology of Zirconia Ⅰ Microsructural Changes during Isothermal Aging of Calcia Partially Stabilized Zirconia Alloy R.H. Hannink;K.A. Johnston;R.T. Pascoe;R.C. Garvie;A.H. Heuer(ed.);L.W. Hobbs(ed.)
  18. J. Eur. Ceram. Soc. v.5 no.327-331 Chemical Stability of Cordierite-ZrO₂Composites N.A. Travitzky;N. Claussen