PERFECTION ANNEAL
FOR MuMETAl®
& co-netic® alloys
MuMETAL®
Stress Annealed
Sheet |
 MuMETAL®
Perfection
Annealed Foil |
MuMETAL® Is Known Worldwide
MuMETAL® alloy recognized as the "industry standard" provides very
high magnetic permeability and the highest possible attenuation available in
sheet and foil forms. Co-NETIC® and NETIC® specialty alloys are also
widely
specified by OEM, Design, and Electrical Engineers because each of these
material types are all field proven scientifically to be the materials of
choice for low-frequency magnetic shielding. Our proprietary brand, MuMETAL®
meets MILSPEC 14411C,
composition 1.
Learn More at Science, Research & Education
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Perfection annealing is a heat treatment process that produces the highest permeability shielding. Typically, atmospherically controlled annealing is required after stamping, machining, bending,
rolling or welding to provide maximum shielding performance.
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Stress Annealed | Final Annealed (Perfection Annealed)
MuMETAL®
is typically stocked in a stress
annealed state to allow further fabrication, stamping,
severe forming or
welding. During fabrication, a material’s grain structure
is weakened. After
final fabrication processes are completed, grain
structure is then modified by
controlled atmospheric annealing to relieve stress in the
material, resulting
in larger grain structure, softer temper, and ultimate
shielding performance.
Although MuMETAL® is available in many forms, most
shields are fabricated from
foil or sheet stock.
Learn more - Manufacturing, Tooling, and Design
Learn more - Fabrication Capabilities
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Perfection Anneal - Optimum Magnetic Properties
After fabricating a magnetic shield, final annealing is generally
required to increase grain structure, which improves shielding
efficiency. Final anneal is a critical process step and extra care must
be taken to avoid dropping or denting as shock may weaken an annealed
shield's grain structure. MuMETAL® magnetic shields are Perfection Annealed (fully annealed
in a controlled hydrogen atmosphere) to Magnetic Shield Corporation's
exacting standards. Optimum magnetic properties are obtained by
annealing at a temperature of 1950-2050°F [about 1120°C], and cooling at
a consistent rate which is critical to maintaining grain structure and
part dimensions. To insure your shield is annealed properly, we can
measure attenuation (a shield's ability to absorb magnetic energy) in
our ISO 9001:2008 certified Quality Control Lab using one of our
Helmholtz Coils. Fully annealed MuMETAL® offers attenuation properties
that are considered the best available for most applications worldwide.
What are the manufacturing and design considerations
for fabricating magnetic shielding?
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Highest efficiency
magnetic shielding
performance |
Magnetic Shield Corporation
Leading the way since 1941 |
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