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Title: A High-Efficiency, Low Cost, High-Temperature Nanocomposite Soft Magnetic Materials for Vehicle Power Electronics.

The charge components for each gas atomization experiment (GA-1-230, GA-1-232, and GA-1-238) was provided by Aegis and consisted of elemental materials, while MPC provided the master alloy arc melted button castings that were added to yield a charge composition of (Co35Fe65)88Zr7B4Cu. The atmosphere in the melting chamber and connected atomization system was evacuated with a mechanical pump prior to backfilling with ultrahigh purity (UHP grade) Ar. The melt was contained in a bottom tapped zirconia crucible with an alumina stopper rod to seal the exit while heating to a pouring temperature of 1550 – 1575oC. When the desired superheat was reached, the stopper rod was lifted and melt flowed through a yttria stabilized zirconia (YSZ) pour tube with a 3.2 mm orifice and was atomized with Ar from a 45-22-052-409 gas atomization nozzle (or atomization die), having a jet apex angle of 45 degrees with 22 cylindrical gas jets (each with diameter of 1.32 mm or 0.052 inches) arrayed around the axis of a 10.4 mm central bore. The Ar atomization gas supply regulator pressure was set to produce nozzle manifold pressures for the series of runs at a pressure of 450 psi. Secondary gas halos of Ar and Hemore » also were added to the interior of the spray chamber at various downstream locations for additional cooling of the atomized droplets and to prevent coalescence of the resulting powder. Powder size analysis and size classification were performed with a full set of ASTM sieves, starting with the 106 µm screen and proceeding down through the 20 µm screen. A Microtrac particle size analyzer was used to verify the size classification results of the particulate resulting from the runs. The resulting powder size distribution results are provided with this report labeled with their respective run numbers (GA-1-230, GA-1-232, and GA-1-238). It should be noted that the size distribution results of the first atomization run were quite acceptable and the same parameters were used for the second and third runs to test the reproducibility for technology transfer purposes.« less
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  1. Ames Laboratory (AMES), Ames, IA (United States)
Publication Date:
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Technical Report
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States