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Formation of structural intermetallics by reactive metal penetration of Ti and Ni oxides and aluminates

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Abstract

Alumina-aluminum composites can be prepared by reactive metal penetration (RMP) of mullite by aluminum. The process is driven by a strong negative free energy for the reaction (8 +x)Al + 3Al6Si2013 → 13Al2O3 + 6Si + xAl. Thermodynamic calculations reveal that titanium oxide, aluminum titanate, nickel oxide, and nickel aluminate all have a negative free energy of reaction with aluminum from 298 to 1800 K, indicating that it may be possible to form alumina-intermetallic composites by reactions of the type (2 +x)Al + (3/y) MOy → Al2O3 + AlxM3/y. Experiments revealed that aluminum reacts with titanium oxide, nickel oxide, and nickel aluminate, but not aluminum titanate, at 1673 K. Reaction with the stoichiometric amount of aluminum (x = 0) leads to the formation of alumina and either titanium or nickel. In some cases, reactions with excess aluminum (x > 0) produce intermetallic compounds such as TiAl3 and NiAl.

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Authors and Affiliations

  1. Chemical and Nuclear Engineering Department, University of New Mexico, 87106, Albuquerque, NM

    William G. Fahrenholtz (Research Assistant Professor)

  2. University Programs and Advanced Materials Department, Sandia National Laboratories, 87106, Albuquerque, NM

    Kevin G. Ewsuk (Senior Member of Technical Staff) & Ronald E. Loehman (Manager)

  3. Lawrence Berkeley Laboratory, 94720, Berkeley, CA

    Antoni P. Tomsia (Staff Scientist)

Authors
  1. William G. Fahrenholtz
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  2. Kevin G. Ewsuk
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  3. Ronald E. Loehman
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  4. Antoni P. Tomsia
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Additional information

This article is based on a presentation made in the “In Situ Reactions for Synthesis of Composites, Ceramics, and Intermetallics” symposium, held February 12–16, 1995, at the TMS Annual Meeting in Las Vegas, Nevada, under the auspices of SMD and ASM-MSD (the ASM/TMS Composites and TMS Powder Materials Committees).

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Fahrenholtz, W.G., Ewsuk, K.G., Loehman, R.E. et al. Formation of structural intermetallics by reactive metal penetration of Ti and Ni oxides and aluminates. Metall Mater Trans A 27, 2100–2104 (1996). https://doi.org/10.1007/BF02651864

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