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Nickel aluminum superalloys created by the self-propagating high-temperature synthesis of nanoparticle reactants

Published online by Cambridge University Press:  01 October 2004

Emily M. Hunt ,
John J. Granier ,
Keith B. Plantier  and
Michelle L. Pantoya
Emily M. Hunt
Affiliation:
Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409
John J. Granier
Affiliation:
Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409
Keith B. Plantier
Affiliation:
Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409
Michelle L. Pantoya*
Affiliation:
Department of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409
*
a) Address all correspondence to this author. e-mail: michelle.pantoya@coe.ttu.edu
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Abstract

Advancements in nanotechnology for material processing via combustion synthesis have spurred the development of superalloys that provide improved protective properties. Nanoscale reactant particles offer unique thermal properties and increased homogeneity that improve the microstructural features and macroscopic properties of the synthesized product. In this study nanoscale molybdenum trioxide (MoO3) particles were added to micron scale nickel (Ni) and aluminum (Al). The goal was to incorporate a nanoscale additive within the reactant matrix that would produce a superalloy by generating excessively high heating rates and creating controlled quantities of Al2O3 (a strengthening agent) within the microstructure of the alloy. Ignition and flame propagation were examined using a CO2 laser and imaging diagnostics that include a copper-vapor laser coupled with a high-speed camera. Product microstructure was examined using micro-x-ray diffraction analysis and scanning electron microscopy. Abrasion testing was performed to evaluate the wear resistance properties of the superalloy. Results show that adding MoO3 increases the flame temperature, results in greater ignition sensitivity, produces a more homogeneous microstructure, and increases the overall wear resistance of the product.

Keywords

Combustion synthesisIntermetallic alloysTribology
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 10 , October 2004 , pp. 3028 - 3036
Copyright
Copyright © Materials Research Society 2004

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