Manufacturer for Large Speaker Magnets - Ferrite – Rumotek
Manufacturer for Large Speaker Magnets - Ferrite – Rumotek Detail:
Hard ferrites based on barium ferrite and strontium powders (chemical formula BaO • 6Fe2O3 and SrO • 6Fe2O3) manufactured. They consist of oxidized metals, thus included in the ceramic materials group. They consist of approx. 90% iron oxide (Fe2O3) and 10% alkaline earth oxide (BaO or SrO) – raw materials which are plentiful and inexpensive. They divide into isotropic and anisotropic, the particles of the latter are aligned in a single
direction which obtaining better magnetic characteristics. Isotropic magnets are shaped by compressing while anisotropic magnets are compressed within a magnetic field. This provides the magnet with a preferential direction and triples its energy density.
As is typical of oxide ceramics, hard ferrite magnets display relatively resistant behavior towards moisture, solvents, alkaline solutions, weak acids, salts, lubricants and gas pollutants. Generally, hard ferrite magnets can therefore be used without additional corrosion protection.
Due to their great hardness (6-7 Mohs), Ferrite magnets are brittle and sensitive to knocks or bending. During processing, they have to be machined with diamond tools. Operating temperatures with ferrite magnets are generally between –40ºC and 250ºC.
Different shapes are used in utomotive engineering, such as automation and measurement control. Other applications such as Automobile electrical machinery (wipers, sit chair motor), Teaching, Door absorber, Magnetic bike and massage chair, etc.
Today, hard ferrites represent the largest proportion of permanent magnets produced. In contrast to AlNiCo magnets, hard ferrites are characterized by flux densities but high coercive field strengths. This results in the generally flat shape of the materials. Barium ferrite and strontium ferrite are differentiated depending on the starting material. All stated values were determined using standard samples according IEC 60404-5. The following specifications serve as reference values and may differ.
|Sintered Ferrite Magnet Physical Properties|
|Grade||Remanence||Rev. Temp. Coeff. Of Br||Coercive Force||Intrinsic Coercive Force||Rev. Temp.-Coeff. Of Hcj||Max. Energy Product||Max. Operating Temperature||Density|
|Br (KGs)||Hcb (KOe)||Hcj (KOe)||(BH)max. (MGOe)||g/cm³|
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We can easily usually fulfill our respected customers with our very good top quality, very good price tag and excellent support due to we have been more expert and much more hard-working and do it in cost-effective way for Manufacturer for Large Speaker Magnets - Ferrite – Rumotek , The product will supply to all over the world, such as: Sri Lanka, Victoria, Holland, So far our merchandise have been exported to east Europe, the Middle East, Southeast, Africa and South America etc. We have now 13years experienced sales and purchase in Isuzu parts at home and abroad and the ownership of the modernized electronic Isuzu parts checking systems. We honor our core principal of Honesty in business, priority in service and will do our best to provide our customers with high quality items and excellent service.
By Bruno Cabrera from Kenya - 2018.06.30 17:29
Good quality and fast delivery, it's very nice. Some products have a little bit problem, but the supplier replaced timely, overall, we are satisfied.
By Miriam from Belgium - 2018.05.13 17:00