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Electrophoretically Applied Dielectrics for Amorphous Metal Foils Used in Pulsed Power Saturable Reactors.

Published online by Cambridge University Press:  22 February 2011

D. J. Sharp ,
H. C. Harjes  and
G. A. Mann
D. J. Sharp
Affiliation:
Sandia National Labs, Albuquerque, NM 87185
H. C. Harjes
Affiliation:
Sandia National Labs, Albuquerque, NM 87185
G. A. Mann
Affiliation:
Sandia National Labs, Albuquerque, NM 87185
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Abstract

Amorphous metal foil-wound inductors have been tested as ferromagnetic saturable inductive elements for pulsed-power (multi-terawatt) switching modules in the inertial confinement fusion program at Sandia National Laboratories. Saturation switching may provide large 100 ns current bursts necessary to accelerate ion beams for the fusion fuel pellet implosion required, for example, in PBFA (particle beam fusion accelerator) operation.

In simulated capacitor testing premature dielectric breakdown of thin polyethylene terephthalate film insulation in the inductor windings occurs at considerably below 2500 V. This appears to be due to inadvertant dielectric damage from micro-spikes on the amorphous foil surface. Electron micrographs and dielectric breakdown data illustrate that electrophoretically-applied dielectric coatings, deposited from organic aqueous colloid dispersions, can be used to provide insulating coatings on the foil which provide a 240% improvement (6000 V) in the breakdown strength of wound amorphous foil inductors.

The theory and operation of a dedicated electrophoretic continuous coating system is described. The machine was constructed and successfully applied for dielectric coating of amorphous metal foil. Additional possible applications exist for practical dielectric coating of metallic films or foils used in various commercial wound-type capacitor structures.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 153: Symposium J – Interfaces Between Polymers, Metals, and Ceramics , 1989 , 229
Copyright
Copyright © Materials Research Society 1989

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References

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