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permanent magnets
today in the world. (BH)max
at different grades of Neodymium magnets is 27 to 50 MGOe.
Neodymium magnets have extremely resistance to demagnetization with Hci,
Intrisic coercive force, over 12,000 Oe.
Because of very high (BH)max and Hci, Neodymium magnets could be used as a
reversible medium for large amount of energy transformation in miniaturized
application where a strong magnetic demagnetization field exists , such as
computer hard drive.
Armstrong Magnetics stocks N35 and N40 Neodymium
magnets in disk and rectangle shapes for customers' immediate needs and
accept special orders for custom Neodymium magnets.
Neodymium
magnets are most powerful of any kind of magnetic materials
Br of Neodymium magnets are much more than 11,000 Gauss. Therefore,
Neodymium magnets have strong holding strength on metal surface and could be
used as component for holding, separating, etc.
Neodymium magnets must be carefully handled to avoid personal injury and material damage
due to its extremely magnetic strength and brittle property.
Neodymium
magnets are sensitive to temperature change and even lose magnet properties at
high temperature
Neodymium magnets lose -0.09 ~ -0.13% of Br/°C
and can work stably under 80°C
for low Hci Neodymium magnets and 150°C
for high Hci Neodymium magnets.
Neodymium
magnets are corrupted in humid environment
Surface protection is strongly recommended, such as plating, varnishing and
encapsulating.
Neodymium
magnets are hard and brittle
Neodymium magnets can be abrasively machined with coolant
served to absorb heating and dust. Without coolant, rare earth magnets
could crack and chip by the heat produced during high speed cutting or
grinding, and the sparks contain the easily oxidized grinding dust that
could cause fire!
Tolerance
of Neodymium magnets
Unless otherwise specified,
tolerance on dimension of magnetization is ±.005”. Other dimensions are ±1.5% or ±.010”, whichever is greater.
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Most powerful