Torroidal cores –
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A B C Torroidal cores – (a) before the annealing, (b) after curing in epoxy, (c) after primary and secondary wire wraps Minority Research Opportunities in Science and Engineering at the US Naval Research Laboratory (NRL) Paul Charles, US Naval Research Laboratory, DMR 0648917 Intellect ual Merit Specific Project Example (2007): “CORE LOSS ANALYSIS OF RAPIDLY SOLDIFIED ALLOYS” •Mentor: Dr. M. Willard - Materials Science and Technology Division •Recently developed nanocrystalline soft magnetic alloys at NRL which exhibit superior magnetic properties at high frequencies •Navy Impact: power electronics applications - inductor core materials •Fine grained microstructure (e.g. 5-15 nm dia.) produced by a two step process: (1) rapid solidification to create an amorphous alloy, and (2) isothermal annealing for crystallization •Student conducted research which investigated core losses of nanocrystalline alloys to determine Magnetic hysteresis loop showing the magnetic induction, B, as a function of magnetic field, H
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A. B. C. Intellectual Merit. Minority Research Opportunities in Science and Engineering at the US Naval Research Laboratory (NRL) Paul Charles, US Naval Research Laboratory, DMR 0648917. Specific Project Example (2007): “CORE LOSS ANALYSIS OF RAPIDLY SOLDIFIED ALLOYS ” - PowerPoint PPT Presentation
Transcript of Torroidal cores –
A B
CTorroidal cores –(a) before the annealing, (b) after curing in epoxy, (c) after primary and secondary wire wraps
Minority Research Opportunities in Science and Engineering at the US Naval Research Laboratory (NRL)
Paul Charles, US Naval Research Laboratory, DMR 0648917
Intellectual Merit
Specific Project Example (2007): “CORE LOSS ANALYSIS OF RAPIDLY SOLDIFIED
ALLOYS”
• Mentor: Dr. M. Willard - Materials Science and Technology Division
• Recently developed nanocrystalline soft magnetic alloys at NRL which exhibit superior magnetic properties at high frequencies
• Navy Impact: power electronics applications - inductor core materials
• Fine grained microstructure (e.g. 5-15 nm dia.) produced by a two step process: (1) rapid solidification to create an amorphous alloy, and (2) isothermal annealing for crystallization
• Student conducted research which investigated core losses of nanocrystalline alloys to determine efficiency of material with respect to frequency and magnetic induction
Magnetic hysteresis loop showing the magnetic induction, B, as a function of magnetic field, H
Minority Research Opportunities in Science and Engineering at the US Naval Research Laboratory (NRL)
Paul Charles, US Naval Research Laboratory, DMR 0648917
Overall Program - Broad Impact:
•Major goal: Encourage minority students to pursue advanced degrees in Science, Math, Engineering, and related disciplines. Emphasis on encouraging students toward graduate studies, teaching, and/or careers in science and technology.
• First hand experience of high level research to students in underrepresented groups. Formal training on laboratory protocols and instrument operation with a gradual progression during their tenure to a much higher level of independence.
•Benefit to scientific community in scientific findings and publications resulting from research projects.
Broader Impact
Organized activities • Scientific and skill set seminars (resume writing) • Weekly and final technical report • Oral presentation • Graduate School site visits (provide students the opportunity to discuss admissions criteria, financial aid, and life as a graduate student)• Picnic, brown bag lunch (open forum for discussions)
An Arc-melter was used to make alloys with new compositions (summer intern and research
associate shown)
