A Nanocrystalline Ni2(Cr,Mo) Intermetallic with Potentially Useful Combination of Properties for Gas Turbine Seal Ring Applications

Journal of Materials Engineering and Performance, August 3, 2011
A Nanocrystalline Ni₂(Cr,Mo) Intermetallic with Potentially Useful Combination of Properties for Gas Turbine Seal Ring Applications
H. M. Tawancy(1)
tawancy@kfupm.edu.sa
Luai M. Al-Hadhrami(1)
Center for Engineering Research and Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum & Minerals, P. O. Box 1639, Dhahran, 31261 Saudi Arabia
Abstract
Seal rings are installed for each turbine stage in gas turbine engines to minimize the loss in gas pressure and maintain engine efficiency. A case study demonstrates how, during service, seal rings become susceptible to failure by thermal fatigue.
Consequently, a lower coefficient of thermal expansion is necessary for these applications. Authors show that long-range ordering in a Ni-Cr-Mo alloy can be used to synthesize a nanocrystalline intermetallic compound combining high strength, high ductility, low coefficient of thermal expansion, and an adequate oxidation resistance up to at least 700 °C.
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