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Journal of Materials Science

, Volume 39, Issue 21, pp 6421–6431 | Cite as

The role of the Al2O3 passivation shell surrounding nano-Al particles in the combustion synthesis of NiAl

  • J. J. Granier
  • K. B. Plantier
  • M. L. Pantoya
Article

Abstract

The self-propagating combustion behaviors of Nickel (Ni) and Aluminum (Al) thermites were studied as a function of bimodal Al particle size distributions. In particular, the low melting temperature of nano-scale Al particles coupled with the low concentrations of Al2O3 in micron-scale Al particles were exploited in order to optimize the macroscopic properties of the final alloy. Bimodal Al size distributions ranging from 0 to 50 wt% nano-Al combined with 50 wt% Ni were studied. Laser ignition experiments were performed on pressed pellets to determine flame propagation behavior and product microstructural features as a function of Al particle size. A new imaging technique is also presented that allows visualization of the surface reaction through highly luminescent flames and more accurate evaluation of burn rates. The wear behavior of the product alloy was measured and reported. Results show that composites composed of more micron-scale than nano-scale Al particles absorb more laser energy prior to flame propagation and experience an effective preheating. When 10–30 wt% nano Al is combined with micron Al and Ni, the wear resistance of the product alloy is optimized. Electron micrographs of the alloys suggest these properties may be attributed to whisker formations that behave as binding strings improving the overall abrasion resistance of the composite.

Keywords

Wear Resistance NiAl Abrasion Resistance Combustion Synthesis Flame Propagation 
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.
    A. VARMA, Scientific American, Aug. (2000) 58.Google Scholar
  2. 2.
    L. L. WANG, Z. A. MUNIR and Y. M. MAXIMOV, J. Mater. Sci. (1993).Google Scholar
  3. 3.
    T. CAMPBELL, R. K. KALIA, A. NAKANO, P. VASHISHTA, S. OGATA and S. ROGERS,Phys. Rev. Lett., 82(24) (1999) 4866.Google Scholar
  4. 4.
    "Personal Communication with Technanogy, Inc." (Santa Anna, CA) and Nanotechnologies, Inc. (Austin, TX).Google Scholar
  5. 5.
    D. E. G. JONES, R. TURCOTTE, Q. KWOK and M. VACHON, "Comparative Studies of the Thermal Hazards of Aluminum Nanopowders," in Proceedings from the 34th International Annual Conference of ICT (Institut Chemische Technologie, June 2003).Google Scholar
  6. 6.
    Q. S. M. KWOK, R. C. FOUCHARD, A.-M. TURCOTTE, P. D. LIGHTFOOT, R. BOWES, and D. E. G. JONES, "Characterization of Aluminum Nanopowder Compositions," Propellants, Explosives and Pyrotechnics, in press (2003).Google Scholar
  7. 7.
    J. J. GRANIER and M. L. PANTOYA, "Laser Ignition of Nanocomposite Thermites," To appear in Combustion and Flame 2004.Google Scholar
  8. 8.
    E. M. HUNT, K. B. PLANTIER and M. L. PANTOYA, Acta Materialia 52(11) (2004) 3183.Google Scholar
  9. 9.
    J.-P. LEBRAT, A. VARMA and P. J. MCGINN, J. Mater. Res. 9(5) (1994) 1184.Google Scholar
  10. 10.
    I. M. HUTCHINGS, Powder Technology 76 (1993) 3.Google Scholar
  11. 11.
    A. S. MUKASYAN, A. S. ROGACHEV and A. VARMA, Chem. Engng. Sci. 54 (1999) 3357.Google Scholar
  12. 12.
    A. S. DUBROVIN, L. V. SLEPOVA, and V. L. KUZNETSOV, Comb. Explos. Shock Waves (Engl. Transl.) 6 (1970) 60.Google Scholar
  13. 13.
    A. MAKINO and C. K. LAW, J. Amer. Ceram. Soc. 77(3) (1994) 778.Google Scholar
  14. 14.
    R. TOMASI and Z. A. MUNIR, ibid. 82(8) (1999) 1985.Google Scholar
  15. 15.
    R. ARMSTRONG, Comb. Sci. and Techn. 71 (1990) 155.Google Scholar
  16. 16.
    J. ECKERT, J. C. HOLZER, C. C. AHN, Z. FU and W.L. JOHNSON, Nanostructu. Mater. 2(4) (1993) 407.Google Scholar
  17. 17.
    H. J. FENG, J. J. MOORE and D. G. WIRTH, "The Combustion Synthesis of TiB2-Al2O3-Al Composite Materials," Proceedings of the Symposium on Developments in Ceramic and Metal Matrix Composites, TMS Annual Meeting, TMS, San Diego (1992) p. 219.Google Scholar
  18. 18.
    J. J. MOORE, D. W. READEY, H. J. FENG, N. PERKINS and D. G. WIRTH, Adv. Powder Metall., Part. Mater. Proc. 9 (1992) 381.Google Scholar

Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • J. J. Granier
  • K. B. Plantier
  • M. L. Pantoya

There are no affiliations available

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