Nano-Composites NiCrAl (MCrAl) Ternary Alloy Powder Synthesized by Mechanical Alloying

Abstract:

The purpose of this study was to explore an innovative method for producing nano-crystalline Ni, Cr and Al powders using high energy ball milling and brief secondary processes. Nano-crystalline powders were produced by using a planetary ball mill. The contaminations of the milled metal/alloy powders were carefully avoided by choosing appropriate lining of the vial and the alloy balls. Two approaches were investigated, namely attrition milling of pure metal powders (e.g. Al, Cr and Ni) and mechanical alloying of the elemental powders to form a ternary alloy of NiCrAl. Currently MCrAlY (M=Ni, Co or Fe) powders, up to 40µm in diameter are used in the production of thermal barrier coatings (TBC) on industrial gas turbine components. The powder samples synthesized were characterized by scanning electron microscope (SEM) and transmission microscope (TEM), the crystallite size was found to be less than 20nm; the powder particle size was in the range of 250-300nm; no undesirable particle contamination was detected. It is anticipated that these very fine particles will increase high temperature properties of the thermally sprayed MCrAlY overlay coatings.

• Periodical: Journal of Nano Research (Volume 6)
• Pages: 169-176
• DOI: https://doi.org/10.4028/www.scientific.net/JNanoR.6.169
• Online since: June 2009
• Authors: Mohammad Sakhawat Hussain, M.A. Ababtain
• Keywords: MCrAlY, Mechanical Alloying (MA), Nanocrystalline, Ternary Alloy, Thermal Barrier Coating (TBC)

References

[1] J.S. Benjamin, Metall. Trans. 1, 2943-2951 (1970).

[2] E. Gaffet, Mater. Trans. 2, 198 (1995).

[3] C. C Koch, O. B Cavin, C. G MaKamey and J.O. Scarbrough, Appl. Phys. Lett. 43, 1017 (1983).

[4] D. M. Jaeger and A. R Jones, Materials for combined cyclic power plant, The Institute of Materials, 1-11, Sheffield, June (1991).

[5] C. Suranarayana, Bibliography on Mechanical Alloying and Milling, International Science Publishing, Cambridge, U.K. (1995).

[6] M. O. Lai and L. Lu, Mechanical Alloying, (1998), Kluwer Academic, Boston, MA. (1998).

[7] J.S. Benjamin and P S Gilman, Metals Handbook, 9th Edition, 722, ASM International, Materials Park, OH. (1983).

[8] B.S. Murty, Int. Mater. Rev. 43, 101 (1998).

[9] E. Kuhn, ASM Handbook, Powder Metallurgy 7, ASM International Materials Park, OH (1983).

[10] E. Artz, G. Dehm, P. Gumbsch, O. Craft and D. Weiss, Prog. Mater. Sci. 46, 282 (2001).

[11] M S Hussain, Salah AlSwailem and Ahmed Hala, Advanced Nano-Composites for High Temperature Aeroengine/Turbine Components", ICON08 at KAU, Jeddah, Saudi Arabia, June 17-19, (2008).

[12] C. L De Castro and B S Mitchell, Nanoparticles from Mechanical Attrition, Synthesis, Functionalization and Surface Treatment of Nanoparticles, Ed: M. I. Baron, 2002, ASP.

[13] M. S. Hussain, Nano-deposition Research Project, Internal Project, Aerospace Research Institute, KACST, Saudi Arabia, (2007).

[14] M S Hussain, Salah AlSwailem and Ahmed Hala, Synthesis of Advanced Nano-Composites MCrAl Powders, ICON08 at KAU, Jeddah, Saudi Arabia, June 17-19, (2008).