Effect of Tetragonal $ZrO_2$ Addition on the Mechanical Properties of $\alpha$-Alumina/La-\beta-Aluminate $Composite

정방정 $ZrO_2$의 첨가가 $\alpha$-Alumina/La-\beta-Aluminate $ 복합체의 기계적 성질에 미치는 영향

  • Suk-Won Kang (Ceramic Materials Lab., Korea Institute of Machinery & Metals) ;
  • Hai-Doo Kim (Ceramic Materials Lab., Korea Institute of Machinery & Metals) ;
  • Shin Kim (Ceramic Materials Lab., Korea Institute of Machinery & Metals) ;
  • Soo-Young Lee (Ceramic Materials Lab., Korea Institute of Machinery & Metals) ;
  • Dong-Soo Park (Ceramic Materials Lab., Korea Institute of Machinery & Metals)
  • 강석원 (한국기계연구원 재료기술연구부) ;
  • 김해두 (한국기계연구원 재료기술연구부) ;
  • 김신 (한국기계연구원 재료기술연구부) ;
  • 이수영 (한국기계연구원 재료기술연구부) ;
  • 박동수 (한국기계연구원 재료기술연구부)
  • Published : 1994.05.01

Abstract

Alumina composite was fabricated by introducing tetragonal ZrO2 in alumina composite of $\alpha$-alumina reinforced with in-situ formed La-$\beta$-aluminate (LaAl11O18). The powder mixture of composition (100-x)[88 Al2O3+(La2O3+11 Al2O3)]+x vol% ZrO2 was prepared with x from 0 to 40. Dense composites fabricated by hot-pressing exhibited bending strength up to 1200 MPa. The gain growth inhibiting effect of ZrO2 grains and La-$\beta$-aluminate platelets, and possibly the stress-induced phase transformation of ZrO2 have resulted in the high bending strength. The fracture toughness of the composite also increased up to 8.5 MPa.m1/2. The enhancement in toughness can be explained by transformation and microcrack toughening of ZrO2 and by crack deflection and bridging of La-$\beta$-aluminate platelets and ZrO2.

Keywords

References

  1. Quantitative Stereology E.E. Underwood
  2. J. Am Ceram. Soc. v.62 no.11-12 The Nature of the Alumina-Rich Phase in the System La₂O₃-Al₂O₃ R.C. Ropp;G.G. Libowitz
  3. Advances in Ceramics(Vol.12, Science and Technology of Zirconia Ⅱ) Mechanical, Thermal and Electrical Properties in the System of Stabilized ZrO₂(Y₂O₃)/α-Al₂O₃- F J. Esper;K.H. Friese;H. Geiger ; N. Claussen(ed.);M Ruhle(ed.);A.H. Heuer(ed.)
  4. J. Am. Ceram Soc v.67 no.6 Calibration Curve for Quantitative Analysis of the Monoclinic-Te-tragonal ZrO₂ System by X-Ray Diffraction H. Toraya;M. Yoshimura;S.Somiya
  5. J Am. Ceram. Soc v.41 no.4 Beta-Alumina-Type Structure in the System Lanthana-Alumina R.S. Roth;S. Hasko
  6. J. Am. Ceram. Soc. v.75 no.9 In-Situ Alumina/Aluminate Platelet Composites P.L. Chen;I.W. Chen
  7. J. Am. Ceram. Soc v.70 no.4 Crack-Interface Grain Bridging as a Fracture Resistance Mechanism in Ceramics:I, Experimental Study on Alumina P.L. Swanson;C.J. Fairbanks;B.R. Lawn;Y.W. Mai;BJ. Hockey
  8. J. Am Ceram. Soc v.66 no.6 Proceeding-Related Fracture Origins; Ⅲ, Differential Sintering of ZrO₂ Agglomerates in Al₂O₃/ZrO₂ Composite F.F. Lange;B.I. Davis;L.A. Aksay
  9. Am. Ceram. Soc Bull v.56 no.6 Effect of Induced Microcracking on the Fracture Toughness of Ceramics N Claussen;J. Steeb;R.F. Pabst
  10. Proceedings of the Seventh Conference on the Silicate Industry, Budapest, June 1963 I.A. Bondar;Ferenc Tamas(ed.)
  11. Materials Sci & Tech. v.1 Transformation-Toughened Zirconia Ceramics E.P. Butler
  12. Advances in Ceramics(Vol.24.Science and Technology of Zirconia Ⅲ) The Role of ZrO₂ in TZP and ZTA T.S. Yen;J.K Guo ;S.Somiya(ed.);N. Yamamoto(ed.);H. Hanagida(ed.)
  13. J. Mater. Sci. v.10 Equilibrium Penny-Like Cracks in Identation Fracture B.R Lawn;E.R. Fuller
  14. U S. Pat. No. 5081082 Production of Alumina Ceramics Reinforced with β'''-Alumina H.D. Kim;S.Y. Lee;J.W. Ko;H.W. kang
  15. J Korean Ceram. Soc. v.29 no.1 Formation of La-β-Aluminate in α-Alumina Matrix and Its Influence on Mechanical Properties S.W. Kang;J.W. Ko;H.D. Kim
  16. J. Am. Ceram Soc v.65 no.12 Stability of Tetragonal ZrO₂ Particles in Ceramic Matrices A.H. Heuer;N. Claussen;W.H. Kriven;M. Ruhle
  17. J. Solid State Chem v.54 Influence of Ions Substitution on the Structure of Lanthanum Hexaaluminates with Magnetoplumbite Sturcture M. Gasperm;M.C.Saine;A. Kahn;F. Laville;A.M. Lejus
  18. J. Am. Ceram. Soc v.66 no.10 Uniformity of Al₂O₃-ZrO₂ Composites by Colloidal Filtration I A. Aksay;F.F. Lange;B.I. Davis
  19. J. Am. Ceram Soc. v.69 no.3 Strength-Toughness Relations in Sintered and Isostatically Hot-Pressed ZrO₂-Toughened Al₂O₁ S. Hori;M. Yoshimura;S. Somiya
  20. J. Am. Ceram. Soc. v.63 no.7-8 Solid-State Kinetics of La-$Al_{11}$$O_{18}$ R.C. Ropp;B.Carroll