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Title: Oxidation Behavior of Fe-Ni Metal Amorphous Nanocomposite (MANC) for High Speed Motor (HSM) Applications.

Abstract

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.1–3 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 studiesmore » were performed between 350 oC and 600 oC for 1 h. Subsequently, isothermal kinetics oxidation study was carried out at 550 oC 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).« less

Authors:
 [1];  [2];  [2];  [2];  [2];  [1]
  1. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  2. National Energy Technology Lab. (NETL), Pittsburgh, PA (United States)
Publication Date:
Research Org.:
Carnegie Mellon University, Pittsburgh, PA
Sponsoring Org.:
USDOE
OSTI Identifier:
1592093
Report Number(s):
DOE-CMU-08870-3
DOE Contract Number:  
EE0008870
Resource Type:
Conference
Resource Relation:
Conference: INTERMAG Conference 2020, Montreal Canada, May 4-8, 2020
Country of Publication:
United States
Language:
English

Citation Formats

Egbu, James, Ohodnicki, Paul, Baltrus, John, Howard, Bret, Wright, Ruishu, and McHenry, Michael E. Oxidation Behavior of Fe-Ni Metal Amorphous Nanocomposite (MANC) for High Speed Motor (HSM) Applications.. United States: N. p., 2020. Web.
Egbu, James, Ohodnicki, Paul, Baltrus, John, Howard, Bret, Wright, Ruishu, & McHenry, Michael E. Oxidation Behavior of Fe-Ni Metal Amorphous Nanocomposite (MANC) for High Speed Motor (HSM) Applications.. United States.
Egbu, James, Ohodnicki, Paul, Baltrus, John, Howard, Bret, Wright, Ruishu, and McHenry, Michael E. Mon . "Oxidation Behavior of Fe-Ni Metal Amorphous Nanocomposite (MANC) for High Speed Motor (HSM) Applications.". United States. https://www.osti.gov/servlets/purl/1592093.
@article{osti_1592093,
title = {Oxidation Behavior of Fe-Ni Metal Amorphous Nanocomposite (MANC) for High Speed Motor (HSM) Applications.},
author = {Egbu, James and Ohodnicki, Paul and Baltrus, John and Howard, Bret and Wright, Ruishu and McHenry, Michael E.},
abstractNote = {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.1–3 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 oC and 600 oC for 1 h. Subsequently, isothermal kinetics oxidation study was carried out at 550 oC 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).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2020},
month = {1}
}

Conference:
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