Microstructure and Mechanical Properties of TiC-Co/Al Composites Prepared by Reaction-Bonded Sintering

반응결합 소결에 의한 TiC-Co/Al 복합체의 미세구조 및 기계적 특성

  • 한인섭 (한국에너지기술연구소 에너지재료연구팀) ;
  • 남기웅 (명지대학교 공과대학 무기재료공학과) ;
  • 정윤중 (명지대학교 공과대학 무기재료공학과)
  • Published : 1995.02.01

Abstract

The TiC-Co/Al reaction-sintered products were prepared by the infiltration of various Co/Al metal mixture into the preform, and their microstructure, phases, and mechanical properties were investigated. With increasing the atomic ratio of Co/Al, tiC grain shape was changed from spherical to platelet particles, and the grain size increased. The crystalline phases found in the liquid matrix formed by the infiltration of Co/Al metal mixture were determined to be Al5Co2 and AlCo by EDS and XRD, and the two crystalline phases were located dominantly between TiC grains, when the Co/Al atomic ratio was lower than an unity. There was a tendency that the density, bending strength and fracture toughness increase with Co/Al atomic ratio until the infiltrated metal was 100% Co. The maximum value was achieved by the composition containing 100% Co infiltrated metal. The Vickers hardness decreased as Co/Al atomic ratio increased.

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References

  1. Special Ceramics The Preparation of Dense Self-Bonded Silicon Carbide P. Popper;P. Popper(ed.)
  2. J. Am. Ceram Soc v.73 no.7 Microstructural Evolution During the Infiltration Treatment of Titanium Crabide-Iron Composites K.W. Chae;D.I. Chun;D.Y. Kim
  3. J. Am. Ceram Soc v.74 no.6 Chemically Induced Migration of Liquid Film and Grain Boundaries in TiN-Ni-(TiC) Alloy Y J. Baik;K.Y. Eun
  4. J. Am Ceram. Soc v.75 no.3 Densification of Reaction-Synthesized Titanium Carbide by High- Velocity Forging J.C. LaSalvia;L.W. Meyer;M H. Meyers
  5. J. Am. Ceram. Soc v.76 no.8 Microstructural Evolution during the Sintering of TiC-Mo-Ni Cermets D.I. Chun;D.Y. Kim;K.Y. Eun
  6. J. Mat Sci. v.10 Equilibrium Penny-like Cracks in Indentation Fracture B.R. Lawn;E.R. Fuller
  7. Sintering Process Ostwald Ripening Processes in the Sintering of Metal Powders Y. Masuda;R. Watanabe;G. C. Kuzynski(ed.)
  8. Encyclopedia of Materials Science and Engineering v.1 Cobalt amd Cobalt Alloys A.M Weinstein;A.J. T. Clemow;M.B. Bever(ed.)
  9. J. Appl. Phys. v.37 Kinetics of Coersening of Spherical Particles in a Liquid Matrix S. Sarin;H.W. Weart
  10. J. Mat Sci. v.3 Microstructural Development Durig the Liquid-Phase Sintering of Two-Phase Alloys with Special Reference to the NbC/Co System R. Warren
  11. Bull. Alloy Phase Diagrams v.10 no.6 The Al-Co(Aluminium-Cobalt) System A.J. McAlister
  12. Inter. J Refrac Hard Met. v.3 Microstructure and Transverse Rupture Strength of Cemented Carbides L. LeRoux
  13. Powder Met. v.13 A Review of Parameters Influencing Some Mechanical Properties of Tungsten Carbide-Cobalt Alloys H.E. Exner;J. Gurland
  14. Metall. Trans. A v.15A Fracture Behavior of W-Ni-Fe Heavy Alloys K.S. Churn;R.M. German
  15. J. Mat. Sci. v.11 Fracture Toughness and Fracture of WC-Co Composites J.L. Chermant;F. Osterstock
  16. Trans TMS-AIME v.203 Relation of Strength, Composition, and Grain Size of Sintered WC-Co Alloys J. Gurland;P. Bardzil