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Metallurgical and Materials Transactions A

, Volume 30, Issue 8, pp 1913–1921 | Cite as

Characterization of the W2C phase formed during the high velocity oxygen fuel spraying of a WC + 12 pct Co powder

  • J. M. Guilemany
  • J. M. de Paco
  • J. R. Miguel
  • J. Nutting
Article

Abstract

A variety of experimental techniques have been used to study a WC-12 pct Co powder and the coatings produced by high velocity oxygen fuel (HVOF) spraying of the powder onto a steel substrate. Many of the structural characteristics of the powder were also found in the coating. However, when the metallic matrix of the powder was melted during thermal spraying, the carbides were partially dissolved and a very heterogeneous liquid phase was produced in which the W/C ratio varied from about 1 to 4. These variations have been linked with oxidation of the liquid phase during spraying. The factors influencing the formation of W2C in the coating have been identified as (1) an in situ transformation of WC into W2C maintaining the original WC faceted morphology and (2) the precipitation of W2C from the W-rich liquid phase matrix as the coating cools. A cobalt containing carbide of the M6C-M12C type has also precipitated from the liquid phase when the W/C and W/Co ratios were high.

Keywords

Carbide Material Transaction Thermal Spray High Velocity Oxygen Fuel Spray Matrix Phase 
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.

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References

  1. 1.
    V. Rammath and N. Jayaraman: Mater. Sci. Technol. 1989, vol. 5, pp. 382–88.Google Scholar
  2. 2.
    B.A. Detering, J.R. Knibloe, and T.L. Eddy: Proc. 3rd Nat. Thermal Spray Conf., Long Beach, CA, ASM International, OH, 1990, pp. 27–31.Google Scholar
  3. 3.
    S.V. Joshi and R. Sivakumar: Surf. Coatings Technol., 1991, vol. 50, pp. 67–74.CrossRefGoogle Scholar
  4. 4.
    K.V. Rao, D.A. Somerville, and D.A. Lee: Proc. 11th Int. Thermal Spraying Conf., 1986, pp. 873–80.Google Scholar
  5. 5.
    P. Mazars, D. Manesse, and C. Lopvet: Proc. 11th Int. Thermal Spray Conf., 1986, pp. 111–15.Google Scholar
  6. 6.
    M. Vardelle, A. Vardelle, and P. Fauchais: Proc. 10th Int. Thermal Spaying Conf., 1983, Essen, Germany, 1983, DVS Dusseldorf (D), 1983, pp. 122–29.Google Scholar
  7. 7.
    P.C. Wolfand F.N. Longo: Proc. 9th Int. Thermal Spraying Conf., 1980.Google Scholar
  8. 8.
    N. Wagner, K. Gnadig, H. Kreye, and H. Kronewetter: Surf. Technol., 1984, vol. 22, pp. 61–71.CrossRefGoogle Scholar
  9. 9.
    M.E. Vinayo, F. Kassabji, J. Guyonnet, and P. Fauchais: J. Vac. Sci. Technol., 1985, vol. A3 (6), pp. 2483–89.Google Scholar
  10. 10.
    D. Tu, S. Chang, C. Chao, and C. Lin: J. Vac. Sci. Technol., 1985, vol. A3 (6), pp. 2479–82.Google Scholar
  11. 11.
    J.R. Fincke, W.D. Swank, and D.C. Haggard: Proc. 7th Nat. Thermal Spray Conf., 1994, Boston, MA, ASM International, 1994, pp. 325–30.Google Scholar
  12. 12.
    J.M. Guilemany and J.M. de Paco: Mem. Bienal Sociedad Espanola Microscopia Electronica, 1997, vol. 1, pp. 121–22.Google Scholar
  13. 13.
    J.M. Guilemany, J. Nutting, and J.M. de Paco: EUROMAT 95, 1995, Associazione Italiana di Metallurgia (Milano, It.), vol. 2, pp. 395–98.Google Scholar
  14. 14.
    J.M. Guilemany and J.M. de Paco: Proc. Thermal Spraying 96, 1996, DVS Dusseldorf (D), 1996, vol. 1, pp. 390–93.Google Scholar

Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 1999

Authors and Affiliations

  • J. M. Guilemany
    • 1
  • J. M. de Paco
    • 1
  • J. R. Miguel
    • 1
  • J. Nutting
    • 1
  1. 1.the Department of Chemical Engineering and MetallurgyUniversity of BarcelonaBarcelonaSpain

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