La description
General Information Ferrite magnets are sintered permanent magnets
composed of Barium or Strontium Ferrite. This class of magnets,
aside from good resistance to demagnetization, has the popular
advantage of low cost. Ferrite magnets are very hard and brittle,
and require specialized machining techniques. Moreover, they should
be machined in an unmagnetized state. We are equipped to machine
these materials to specifications. Anisotropic grades are oriented
in the manufacturing direction, and must be magnetized in the
direction of orientation. Isotropic grades are not oriented and can
be magnetized in any direction, although some degree of greater
magnetic strength will be found in the pressing dimension, usually
the shortest dimension. Due to their low cost, Ferrite magnets
enjoy a very wide range of applications, from motors and
loudspeakers to toys and crafts, and are the most widely used
permanent magnets today. Pressing and sintering involves pressing
very fine ferrite powder in a die, and then sintering this pressed
magnet. All fully dense Ferrite magnets are produced this way.
Ferrite magnets can be wet pressed or dry pressed. Wet pressing
yields better magnetic properties, but poorer physical tolerances.
Generally, the powder is dry for grade 1 or 5 materials, and wet
for grade 8 and higher materials. Sintering involves subjecting the
material to high temperatures to fuse the pressed powder together,
thus creating a solid material. Magnets produced through this
process usually need to have some finish machining, otherwise
surface finishes and tolerances are not acceptable. Some
manufacturers extrude instead of press wet powder slurry and then
sinter the material. This is sometimes done for arc segment shapes,
where the arc cross-section is extruded in long lengths, sintered,
and then cut to length. Assemblies We are able to manufacture metal
and other components of finished sub assemblies using our CNC
machining facilities. Assemblies using metal or other components
and magnets can be fabricated by adhering magnets with adhesives to
suit a range of environments, by mechanically fastening magnets, or
by a combination of these methods. Due to the relatively brittle
nature of these magnet materials, press fits are not recommended.
Surface Treatments The corrosion resistance of Ferrite is
considered excellent , and no surface treatments are required.
However, Ferrite magnets may have a thin film of fine magnet powder
on the surface and for clean, non-contaminated applications, some
form of coating may be required. Magnetizing and Handling Ferrite
magnets require magnetizing fields of about *0 kOe. They can be
magnetized with multiple poles on one or both pole surfaces. No
special handling precautions are required, except that large blocks
of Ferrite magnets are powerful, and care should be taken to ensure
that they do not snap towards each other. Temperature Effects Up to
about **0°F, changes in magnetization are largely reversible, while
changes between **0°F and ***0°F are re-magnetizable. For all
Ferrite magnets, the degradation of magnetic properties is
essentially linear with temperature. At **0F, about *5% of room
temperature magnetization is retained, and at **0°F, about *0% is
retained.
| Pays: |
China |
| N ° de modèle: |
c5
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(Negotiable)
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| Localité: |
ningbo |
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