Effects of Mo Addition on the Microstructures and Mechanical Properties of $Al_2O_3$ Ceramics

Mo첨가가 $Al_2O_3$ 세라믹스의 미세구조 및 기계적 성질에 미치는 영향

  • 박정현 (연세대학교 요업공학과) ;
  • 문성환 (연세대학교 요업공학과) ;
  • 백승수 (연세대학교 요업공학과) ;
  • 정동익 (연세대학교 요업공학과)
  • Published : 1988.03.01

Abstract

To investigate the effects of Mo addition on the microstructures and mechanical properties of Al_2O_3$ ceramics, two kinds of Mo particles with average sizes of 2-${\mu}{\textrm}{m}$ and 6-${\mu}{\textrm}{m}$ were used as additives. It was shown that Mo particles inhibited the grain growth of Al_2O_3$, and the smaller Mo particles were more effective. In case of 2-${\mu}{\textrm}{m}$ Mo dispersion, the bending strength and the fracture toughness were increased. Dispersion of 6-${\mu}{\textrm}{m}$ MO did not increase the strength but improved the fracture toughness a little. The toughening mechanisms of Al_2O_3$-Mo composites are thought to be the crack deflection and microcracking mechanisms.

Keywords

References

  1. Fracture in Ceramic Materials Induced Microcracking: Effects of Applied Stress A.G. Evans;Y. Fu
  2. J. Am. Ceram. Soc. v.59 no.7-8 Fracture Toughness Determination by Indentation A.G. Evans;E.A. Charles
  3. J. Am. Ceram. Soc. v.49 no.9 Dispersion Strengthened Aluminum Oxide C.O. Mchugh;t.J. Whalen;M. Humenik Jr.
  4. J. Am. Ceram. Soc. v.44 no.8 Internal Stresses in Ceramics J. Selsing
  5. J. Am. Ceram. Soc. v.68 no.5-6 REVIEW-Transformation Toughening in Ceramics: Martensitic Transformations in Crack-Tip Stress Fields A.G. Evans;A.H. Heuer
  6. J. Am. Ceram. Soc. v.64 no.8 Thermal Diffusivities of Molybdenum/Alumnia Cermets H.C. Miller
  7. Trans. AIME v.180 Some Factors Affecting the Rate of Grain Growth in Metals[70:30 Brass] C. Zener;J.E. Burke
  8. Am. Ceram. Soc. Bull. v.61 no.9 Thermal-Shock Resistant Alumnia-Metal Insulators C.S. Morgan;A.J. Moorhead;R.J. Lauf
  9. J. Am. Ceram. Soc. v.54 no.1 Fracture Energy of Al₂O₃ Containing Mo Fibers L.A. Simpson;A. Wasylyshyn
  10. Am. Cem. Soc. Bull. v.58 no.4 Molybdenum Reinforced Aluminum Oxide Single Crystal J.W. Mccauley;F. Schmid;D.J. Viechniki
  11. Fracture Mechanics of Ceramics v.2 Criteria for Crack Extension and Arrest in Residual, Localized Stress Field Associated with Second Phase Particles F.F. Lange
  12. J. Am. Ceram. Soc. v.48 no.3 Remarks on Sintering Kinetics G.F. Bolling
  13. Fracture Mechanics of Ceramics v.6 K.T. Faber;A.G. Evans;M.D. Drory;R.C. Bradt(et al.)
  14. Ceram. Eng. Sci. Proc. v.2 no.7-8 Mechanisms of Toughning in Ceramic Matrix Composites R.W. Rice
  15. J. Am. Ceram. soc. v.64 no.7 Toughening of Ceramics by Circumferential Microcracking A.G. Evans;K.T. Faber
  16. J. Am. Ceram. Soc. v.60 no.9 Strength and Toughness of a Ceramic Reinforced with Metal Wires J.G. Zwissler;M.E. Fine
  17. J. Am. Ceram. Soc. v.54 no.6 Hot-Pressing and Mechanical Properties of Al₂O₃with an Dispersed Phase D.T. Rankin;J.J. Stiglich;D.R. Petrak;Rober Rub