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Ukraine
連絡先担当者 Kate
Poltava, Poltava Oblast
A permanent magnet is a magnet that
is permanent, in contrast to an electromagnet, which only behaves
like a magnet when an electric current is flowing through it.
Permanent magnets are made out of substances like magnetite
(Fe3O4), the most magnetic naturally
occurring mineral, a
powerfully magnetic synthetic
substance. The alloys
from which permanent magnets are made are often very difficult to
handle metallurgically. They are mechanically hard and brittle.
They may be cast and then ground into shape, or even ground to a
powder and formed.
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