Oxidation Behavior of Rh–30Ni–18Nb Refractory Superalloy |
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| Authors: | Mahapatra R.N. Varma S.K. Lei C. Agarwala V.V. |
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| Affiliation: | 1. Aircraft Division, Naval Air Warfare Center, Patuxent River, MD, 20650, USA
2. Department of Metallurgical and Materials Engineering, The University of Texas at El Paso, El Paso, TX, 79968
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| Abstract: | The isothermal-oxidation behavior of Rh–30Ni–18Nb refractory alloy was investigated up to a period of 312 hours in air from 1000 to 1350°C. A comparison of the oxidation behavior of this alloy with a conventional Ni-base superalloy (Inconel 713 C) shows an order-of-magnitude higher oxidation resistance. This experimental alloy oxidizes by forming alternate layers of Nb2O5 and RhO while NiO is on the surface in contact with air. Optical and scanning-electron microscopy (SEM) was used to study the microstructure and morphology for the characterization of the oxides. Thermal stability of the alloy for extended periods of exposure to air at 1400°C was studied using transmission-electron microscopy (TEM). |
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