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Title: Magnetic shielding

A magnetically-conductive filler material bridges the gap between a multi-part magnetic shield structure which substantially encloses a predetermined volume so as to minimize the ingress or egress of magnetic fields with respect to that volume. The filler material includes a heavy concentration of single-magnetic-domain-sized particles of a magnetically conductive material (e.g. soft iron, carbon steel or the like) dispersed throughout a carrier material which is generally a non-magnetic material that is at least sometimes in a plastic or liquid state. The maximum cross-sectional particle dimension is substantially less than the nominal dimension of the gap to be filled. An epoxy base material (i.e. without any hardening additive) low volatility vacuum greases or the like may be used for the carrier material. The structure is preferably exposed to the expected ambient magnetic field while the carrier is in a plastic or liquid state so as to facilitate alignment of the single-magnetic-domain-sized particles with the expected magnetic field lines. 3 figs.
Authors:
; ;
Publication Date:
OSTI Identifier:
7147608
Report Number(s):
US 4698197; A
PPN: US 6-701010
DOE Contract Number:
W-7405-ENG-48
Resource Type:
Patent
Resource Relation:
Patent File Date: 12 Feb 1985
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; MAGNETIC SHIELDING; SHIELDS; DESIGN; EPOXIDES; SHIELDING MATERIALS; MATERIALS; ORGANIC COMPOUNDS; ORGANIC OXYGEN COMPOUNDS; SHIELDING 420200* -- Engineering-- Facilities, Equipment, & Techniques