Thermo-mechanical Properties and Microstructures of $ZTA-Al_2O_3$ Whisker Composites

$ZTA-Al_2O_3$ Whisker계 복합재료의 미세구조 변화에 따른 열적, 기계적 특성에 관한 연구

  • 이문환 (한양대학교 공과대학 무기재료공학과) ;
  • 최성철 (한양대학교 공과대학 무기재료공학과) ;
  • 이응상 (한양대학교 공과대학 무기재료공학과)
  • Published : 1993.06.01

Abstract

In oxide matrix-SiC(W) composites, instability and glassy phase formation due to oxidation at the high temperature and the diffusion of Si, respectively, cause brittle fracture and low reliability for ceramic materials. The mode of contribution in each mechanisms induced by matrix-whisker debonding, varies with the morphology of matrix-whisker interfaces. This work has described the dispersion behaviours and stabilization mechanisms in slip systems, and multiple toughening mechanisms by dint of two second phase different from each other when spherical ZrO2 and chemically stable Al2O3(W) is respectively added in Al2O3 matrix. To obtain complexshaped components, slip casted bodies were sintered at 1$600^{\circ}C$, 2hrs up to 98~99% R.D.. Multiple toughening mechanisms in comparison with theories reported until now will be discussed as a result of the phase analysis of ZrO2 by athermal behaviours and microstructural characterizations as well as measured mechanical properties.

Keywords

References

  1. J. Am. Ceram. Soc. v.59 no.1-2 Fracture Toughness of Al₂O₃with Unstabilized ZrO₂Dispersed Phase N. Claussen
  2. J. Am. Ceram. Soc. v.73 no.2 Perspective on the Development of High-Toughness Ceramics A.G. Evans
  3. Acta Metall. v.31 no.4 Crack Deflection Process. I. Theory A.G. Evans;K. T. Faber
  4. J. Am. Ceram. Soc. v.64 no.9 A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: Ⅱ, Strengh Method P. Chantikul;G.R. Antis;B.R. Lawn;D.B. Marshall
  5. DGM/DKG-Symposium Untersuchungen uber den Einflu von zugegebenen Kemen auf die Herstellung von umwandlungsverstarkter Kermik uber ein Sol-Gel-Verfahren C.S. Oh;G. Tomandl
  6. J. Eur. Ceram. Soc. v.5 Chemical Stability of Cordierite-ZrO₂Composites N.A. Travitzky;N. Claussen
  7. Science and Technolgy of Ziroconia Ⅱ, Advance in Ceramics v.12 Microstructural Studies of Y2O3-Containing Tetragonal Zirconia Polycrystals(Y-TZP) M. Rhle;N. Claussen;A.H. Heuer;N. Claussen(Ed.);M. Ruhle(Ed.);A.H. Heuer(Ed.)
  8. J. Am. Ceram. Soc. v.70 no.C Sintering and Mechanical Properties of Yttria-doped Tetragonal Zirconia-Mullite Composites M. Ishtsuka;T. Sato;M. Shimada
  9. J. Mater. Sci. v.22 Yttra Migration in Y-TZP during High-Temperature Annealing P.J. Whalen;F. Reidinger;S.T. Correale;J. Marti
  10. Mat. Sci. and Eng. v.71 Strenghening Strategies for ZrO₂-Toughened Ceramics at High Temperatures N. Claussen
  11. J. Am. Ceram. Soc. v.66 no.10 Uniformity of Al₂-O₃-ZrO₂Composites by Colloidal Filtration I.A. Aksay;F.F. Lange;B.I. Davis
  12. cfi/Ber. v.69 no.3 Investigation of the Deflocculation and the Cast-forming Behavior of SiC Slips St. Gutze;W. Schulle;H.W. Hennike
  13. Basic Principles of Colloid Science D.H. Everett
  14. Advance in Ceramics, Ceramic powder science v.21 Electrokinetic Behavior of Al₂O₃and ZrO₂Powder in Dilute and Concentrated Aqueous Dispersions E.M. Deliso;A.S. Rao;W.R. Cannon;G.L. Messing(Ed.);S. Mazdiyasni(Ed.);J.W. McCanley(Ed.);R.A. Harver(Ed.)
  15. Advance in Ceramics, Ceramic Powder Science v.21 Chemically Bonde Organic Dispersants M. Green;T. Kramer;M. Parish;J. Fox;R. Lalanandham;W. Rhine;S. Barclay;P. Calvert;H.K. Bowen;G.L. Messing(Ed.);S. Mazdiyasni(Ed.);JW. McCanley(Ed.);R.A. Harver(Ed.)
  16. Am. Cer. Soc. Bull. v.69 no.5 Slip Casting of High-Purity Alumina Using Sodium Carboxymethylcellulose as Deflocculant/Binder A.J. Ruys;C.C. Sorell
  17. Euro-Ceramics, Processing of Ceramics v.1 Optimization of Slip-Casting Technique for Short Fiber and Whisker Reinforced Ceramic Composites J. Lehman;B. Muller;G. Ziegler;G. de With(Ed.);R.A. Terpstra(Ed.);R. Metselaar(Ed.)
  18. Handbook of Composites, Strong Fibers v.1 Alumina Fibers: Preparation, Properties and Applications J.D. Brichall;J.A.A. Bradbury;J. Dinwoodie;W. Watt(Ed.);B.V. Perov(Ed.)
  19. Factors Influencing the Toughening Behavior of Whisker Reinforce in Whisker and Fiber-Toughened Ceramics P.F. Becher;C.H. Hseuh;P. Angelini;T.N. Tieg;R.A. Bradley(ed.);D.E. Clark(ed.);D.C. Larsen(ed.);J.O. Stiegler(ed.)
  20. Fracture Mechanics of Ceramics v.7 no.61-74 Toughening of ceramics by whisker reinforcements P.F. Becher;T.N. Tiegs;J.C. Ogle;W.M. Warwick