Oxidation Behavior of Fe-Ni Metal Amorphous Nanocomposite (MANC) for High Speed Motor (HSM) Applications.
- Carnegie Mellon Univ., Pittsburgh, PA (United States); Carnegie Mellon University
- National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
New interest in high performance soft magnetic materials (SMMs) have been pushed by the need to lower losses at higher operating frequencies while maintaining high flux density and tunable permeability in power conversion, electronic, and motor applications. Conventional SMMs like electrical steels and Fe-based metal amorphous nanocomposite (MANC) alloys are dominated by eddy current losses at high frequencies and brittle mechanical properties, respectively. Recent breakthrough in high-performance Fe-Ni metal amorphous nanocomposite (MANC) SMMs have shown promise in reducing eddy current losses as compared to electrical steels while retaining excellent mechanical properties. Their intrinsic adherent native surface oxide layer provides sufficient electrical insulation to reduce interlaminate eddy current losses. While Co-based MANCs also show superior mechanical properties, the low cost of Ni compared to Co makes Fe-Ni MANC alloys a superior system with good saturation induction, tunable permeability, and low losses for the high frequency switching applications mentioned above.
Notwithstanding advances in MANCs, there exists a gap in the literature on investigations of the surface oxide layer responsible for a significant reduction of interlaminate eddy current losses in magnetic cores. This work examines the nature of the surface oxide, oxidation behavior, and relationship between oxide thickness and resistivity. Isochronal oxidation studies were performed between 350 °C and 600 °C for 1 h. Subsequently, isothermal kinetics oxidation study was carried out at 550 °C between thermal annealing times of 1 to 48 h. For characterization of oxide surface layer thickness and composition as a function of time, annealed FeNi alloy samples were analyzed by X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The morphology of the surface of the annealed samples were examined by scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDS).
- Research Organization:
- Carnegie Mellon University, Pittsburgh, PA
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- EE0008870
- OSTI ID:
- 1592093
- Report Number(s):
- DOE-CMU-08870-3
- Country of Publication:
- United States
- Language:
- English
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