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magnets are composed of primarily aluminium, nickel, and cobalt, were developed
in the 1940's. This class of magnet remains a preferred material because of it's
excellent temperature stability, high magnetic flux density, and resistance to
corrosion. Alnico magnets are manufactured through a casting or sintering
process. The casting process allows for the magnet to be manufactured into
intricate and complex shapes, which are not possible with other magnetic
Typical types and applications
(Table not really suitable of iPhone's)
Excellent temperature stability, high
residual induction and relatively high energy characterises the
Alnico materials, which are composed primarily of alloys of
Aluminium, Nickel, and Cobalt. They are manufactured through either
a casting or sintering process. Cast magnets may be manufactured in
complex shapes, such as horseshoes etc. Sintered Alnico offer
slightly lower magnetic properties but better mechanical
characteristics than cast Alnico.
Cast Alnico 5 is the most commonly
used of all the cast Alnico magnets. This material is used
extensively in rotating machinery, meters, instruments, sensing
devices, and holding applications, to name but a few.
Alnico is hard and brittle and cannot
be machined or drilled. Holes are usually cored in at the
foundry, and magnets are cast close to final size and then finished
by grinding to close tolerances.
Alnico has a low coercive force, and
is easily demagnetized if not handled with care. For optimum
performance of Alnico 5, the magnetic length should be approximately
5 times the pole diameter or equivalent diameter. For example,
a 0.250" diameter magnet should be about 1.00" long.
Because of its higher coercivity,
Alnico 8 may be used in shorter lengths and in disc shapes.
(Tables not really suitable of iPhone's)