Advertisement

Metals and Materials

, 6:533 | Cite as

Simultaneous synthesis and densification of WSi2 and WSi2-20vol.%Nb composite by field-activated and pressure-assisted combustion

  • I. J. Shon
  • D. H. Rho
  • H. C. Kim
Article

Abstract

A method to simultaneously synthesize and consolidate the silicide WSi2 and the composite WSi2-20 vol.%Nb from W, Si, and Nb powders was investigated. Combustion synthesis was carried out under the combined effect of an electric field and mechanical pressure. The final density of the products increased nearly linearly with the applied pressure. Highly dense WSi2 and WSi2-20 vol.%Nb with relative densities of up to 97% were produced under the simultaneous application of a 60 MPa pressure and a 3000A current on the reactant powders. The percentages of the total shrinkage occurring before and during the synthesis reaction were 17 and 83% for the WSi2, and 22 and 78% for the WSi2-20 vol.% Nb. The respective Vickers microhardness values for these materials were 8.2 and 5.8 GPa. From indentation crack measurements, the fracture toughness values for WSi2 and WSi2-20 vol.%Nb were calculated to be 3.2 and 9.1 MPa m12, respectively.

keywords

combustion synthesis densification tungsten silicides composite electric field 

References

  1. 1.
    T. B. Massalski, J. L. Murrary, L. H. Bennett and H. B. Baker,Binary Alloy Phase Diagrams, p. 2063, American Society for Metals, Ohio (1986).Google Scholar
  2. 2.
    Gorhard Sauthoff,Intermetallics, p. 115, VCH Publishers, New York (1995).CrossRefGoogle Scholar
  3. 3.
    L. F. Mattesis,Phys. Rev. 4, 3252 (1992).Google Scholar
  4. 4.
    L. Show and R. Abbaschian,Acta metall. mater. 42, 213 (1994).CrossRefGoogle Scholar
  5. 5.
    E. Lvanov,Proc. of the 2 nd Int. Conf. on Structural Application at Mechanical Alloying, p.415, Vancouver, British, Columbia, Canada (1993).Google Scholar
  6. 6.
    N. Lawamoto and S. Uesake,Mater Sci. Forum 88,763 (1992).CrossRefGoogle Scholar
  7. 7.
    S. Gedevanishvili and Z. A. Munir,Scripta metall. mater. 31,741 (1994).CrossRefGoogle Scholar
  8. 8.
    A. Feng and and Z. A. Munir,Appl. Phys. 76,1927 (1994).CrossRefGoogle Scholar
  9. 9.
    I. J. Shon and Z. A. Munir,Mater. Sci. Eng. A 202, 256 (1995).CrossRefGoogle Scholar
  10. 10.
    Z. A. Munir, W. Lai, and K. Ewald,U. S. Pat. No. 538010P (1995).Google Scholar
  11. 11.
    I. J. Shon,Metals and Materials 3,199 (1997).CrossRefGoogle Scholar
  12. 12.
    I. J. Shon and H. C. Kim,J. Kor. Inst. Met. & Mater. 35, 1763 (1997).Google Scholar
  13. 13.
    I. J. Shon, H. C. Kim, D.H.Rho and Z. A. Munir,Mater. Sci. Eng. A 269,129 (1999).CrossRefGoogle Scholar
  14. 14.
    B. R. Zhang and F. Marino,J. Am. Ceram Soe. 80, 269 (1994).CrossRefGoogle Scholar
  15. 15.
    N. Koichi,Ceramics 20, 1218 (1985).Google Scholar
  16. 16.
    J. M. Choi, K. H. Lee, J. H. Ryu, W. S. Cho and S. W. Choi,J. Kor. Ceram. Soe. 36,451 (1999).MATHGoogle Scholar

Copyright information

© Springer 2000

Authors and Affiliations

  • I. J. Shon
    • 1
  • D. H. Rho
    • 1
  • H. C. Kim
    • 1
  1. 1.Department of Materials EngineeringChonbuk National University Research Institute of Industrial TechnologyDeogjin-ku, ChonbukKorea

Personalised recommendations