Advertisement

Metallurgical and Materials Transactions A

, Volume 27, Issue 12, pp 3761–3772 | Cite as

The deposition of aluminide and silicide coatings on γ-TiAl using the halide-activated pack cementation method

  • T. C. Munro
  • B. Gleeson
Article

Abstract

The halide-activated pack cementation method (HAPC) was utilized to deposit aluminide and silicide coatings on nominally stoichiometric γ-TiAl. The deposition temperature was 1000°C and deposition times ranged from 2 to 12 hours. The growth rates of the coatings were diffusion controlled, with the rate of aluminide growth being about a factor of 2 greater than that of silicide growth. The aluminide coating was inward growing and consisted of a thick, uniform outer layer of TiAl3 and a thin inner layer of TiAl2, with the rate-controlling step being the diffusion of aluminum from the pack into the substrate. Annealing experiments at 1100 °C showed that the interdiffusion between the aluminide coating and the γ-TiAl substrate was rapid. In contrast to the aluminide coating, the silicide coating was nonuniform and porous, consisting primarily of TiSi2, TiSi, and Ti5Si4, with the rate-controlling step for the coating growth believed to be the diffusion of aluminum into the γ-TiAl ahead of the silicide/γ-TiAl interface. The microstructural evolution of the aluminide and silicide coating structures is discussed qualitatively.

Keywords

Material Transaction Coating Morphology Aluminide Coating Coating Growth Pack Cementation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D.M. Dimiduk, D.B. Miracle, and C.H. Ward:Mater. Sci. Technol., 1992, vol. 8, pp. 367–75.Google Scholar
  2. 2.
    S.A. Kekare, D.K. Shelton, and P.B. Aswath: inStructural Intermetallics, R. Dariola, J.J. Lewandowski, C.T. Liu, P.L. Martin, D.B. Miracle, and M.V. Nathal, eds, TMS, Warrendale, PA, 1993, pp. 325–34.Google Scholar
  3. 3.
    R.A. Perkins, K.T. Chiang, and G.H. Meier:Scripta Metall., 1987, vol. 21, pp. 1505–10.CrossRefGoogle Scholar
  4. 4.
    M. Yoshihara, T. Suzuki, and R. Tanaka:Iron Steel Inst. Jpn. Int., 1991, vol. 31, pp. 1201–06.Google Scholar
  5. 5.
    H. Mabuchi, T. Asai, and Y. Nakayama:Scripta Metall., 1989, vol. 23, pp. 685–89.CrossRefGoogle Scholar
  6. 6.
    J.A. Nesbitt N.S. Jacobson, and R.A. Miller: inSurface Modification Engineering Volume II: Technological Aspects, P. Kosowosky, ed., CRC Press, Boca Raton, FL, 1989, pp. 22–66.Google Scholar
  7. 7.
    S.R. Levine and R.M. Caves:J. Electrochem. Soc., 1974, vol. 121, pp. 1051–64.Google Scholar
  8. 8.
    L.L. Seigle: inSurface Engineering, P. Kossowsky and S.C. Singhal, eds., Martinus Nijhoff Publishers, Dordrecht, The Netherlands, 1984, pp. 345–69.Google Scholar
  9. 9.
    D.M. Dimiduk, D.B. Miracle, Y.-W. Kim, and M.G. Mendiratta:Iron Steel Inst. Jpn., 1991, vol. 31, pp. 1223–34.Google Scholar
  10. 10.
    Ternary Alloys: A Comprehensive Compendium of Evaluated Constitutional Data and Phase Diagrams, G. Petzow and G. Effenberg, eds., VCH Publishers, New York, NY, 1993, p. 290.Google Scholar
  11. 11.
    G. Wang, B. Gleeson, and D.L. Douglass:Oxid. Met., 1989, vol. 31, pp. 415–29.CrossRefGoogle Scholar
  12. 12.
    B. Cockeram and R.A. Rapp:Metall. Mater. Trans. A, 1995, vol. 26A, pp. 777–91.Google Scholar
  13. 13.
    T.C. Munro and B. Gleeson:Mater. Sci. Forum, in press.Google Scholar
  14. 14.
    G.W. Goward and D.H. Boone:Oxid. Met., 1971, vol. 3, pp. 475–95.CrossRefGoogle Scholar
  15. 15.
    F.J.J. van Loo and G.D. Rieck:Acta Metall., 1973, vol. 21, pp. 61–71.CrossRefGoogle Scholar
  16. 16.
    F.J.J. van Loo and G.D. Rieck:Acta Metall., 1973, vol. 21, pp. 73–84.CrossRefGoogle Scholar
  17. 17.
    J.I. Goldstein, S.K. Choi, F.J.J. Van Loo, H.J.M. Heijligers, G.F. Bastin, and W.G. Sloof:Scanning, 1993, vol. 15, pp. 165–70.Google Scholar
  18. 18.
    P. Shewmon:Diffusion in Solids, 2nd ed., TMS, Warrendale, PA, 1989, p. 132.Google Scholar
  19. 19.
    B. Cockeram and R.A. Rapp:Mater. Sci. Eng., 1995, vols. A192–A193, pp. 980–986.Google Scholar
  20. 20.
    C. Brukl, H. Nowotny, O. Schob, and F. Benesovsky:Monatsh. Chem., 1966, vol. 92, pp. 781–88.CrossRefGoogle Scholar
  21. 21.
    A. Raman and K. SchubertZ. Metallkd., 1965, vol. 56, pp. 44–52.Google Scholar
  22. 22.
    A. Rahmel and M. Schütze:Oxid. Met., 1992, vol. 38, pp. 255–66.CrossRefGoogle Scholar
  23. 23.
    J.L. Smialek, M.A. Gedwill, and P.K. Brindley:Scripta Metall. Mater., 1990, vol. 24, pp. 1291–96.CrossRefGoogle Scholar
  24. 24.
    M. Yamaguchi:Mater. Sci. Technol., 1992, vol. 8, pp. 299–307.Google Scholar
  25. 25.
    R. Streiff and S. Poize: inHigh Temperature Corrosion, R.A. Rapp, ed., NACE Publications, Houston, TX, 1983, pp. 591–97.Google Scholar
  26. 26.
    G.V. Kidson:J. Nucl. Mater., 1961, vol. 3, pp. 21–29.CrossRefGoogle Scholar
  27. 27.
    P. Shewmon:Diffusion in Solids, 2nd ed., TMS, Warrendale, PA, 1989, p. 190.Google Scholar
  28. 28.
    A. Rahmel and P.J. Spencer:Oxid. Met., 1991, vol. 35, pp. 53–68.CrossRefGoogle Scholar
  29. 29.
    J.A. DeKock: Ph.D. Thesis, University of Wisconsin, Madison, WI, 1995.Google Scholar
  30. 30.
    U.R. Kattner, J.-C. Lin, and Y.A. Chang:Metall. Trans. A, 1992, vol. 23, pp. 2081–90.Google Scholar
  31. 31.
    J.C. Schuster and H. Isper:Z. Metallkd., 1990, vol. 81, pp. 389–96.Google Scholar
  32. 32.
    F.J.J. Van Loo, J.A. van Beek, G.F. Bastin, and R. Metselaar:Oxid. Met., 1984, vol. 22, pp. 161–81.CrossRefGoogle Scholar
  33. 33.
    R.T. DeHoff:Thermodynamics in Materials Science, McGraw-Hill, Inc., New York, NY, 1993, p. 225.Google Scholar
  34. 34.
    I. Langmuir:Phys. Rev., 1913, vol. 2, p. 213.Google Scholar
  35. 35.
    M.P. Brady: NASA-Lewis Research Center, Cleveland, OH, personal communication, 1995.Google Scholar
  36. 36.
    S.C. Kung and R.A. Rapp:Oxid. Met., 1989, vol. 32, pp. 89–109.CrossRefGoogle Scholar

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1996

Authors and Affiliations

  • T. C. Munro
    • 1
  • B. Gleeson
    • 1
  1. 1.the School of Materials Science and EngineeringThe University of New South WalesSydneyAustralia

Personalised recommendations