ferrite motor magnets / ferrite arc magnet / segment ferrite magnet

Description

1.Certification:The products are manufactured according to ISO***1:***8 quality system.
2.Grades:Y*0T,Y*0,Y*5,Y*0,Y*0BH,Y*5(China standard);C1,C5,C8,C*1(U.S.A. Standard)
3.Magnetic properties:
Relatively brittle and hard
Good resistance to demagnetization
Good temperature stability.
4.Advantages:
Raw material is readily available & low in cost
Various shapes and sizes or according to customer\'s request

Manufacturing 
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.
 
Injection Molding: Ferrite powder is mixed into a compound and then injection molded in the same way as plastic.
Tooling for this manufacturing process is usually very costly. However, parts produced through this process can have very intricate shapes and tight tolerances. Injection molded ferrite properties are either lower or about the same as grade 1 Ferrite.
 

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 **0F, changes in magnetization are largely reversible, while changes between **0F and ***0 F are re-magnetizable.
For all Ferrite magnets, the degradation of magnetic properties is essentially linear with temperature.
At **0 F, about *5% of room temperature magnetization is retained, and at **0 F, about *0% is retained.

Common Applications for Ferrite Magnets
Ferrite magnets are widely used in motors, magnetic couplings, for sensing, loudspeakers, holding-magnet systems, crafts, magnetic therapy, novelties, and toys