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Sintered Hard Ferrite Magnets

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Hard Ferrite Magnets
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,...
Pot Ndfeb Ferrite Magnets
Specification:D20mmXd6X6.5mm Material: inner- Ferrite outer- Plastic magnetization direction: axial Coating: null Character: Beautiful appearance difficult to broke longer service life Application: Widely used in industrial and living fields, such as packing, family, office and so
Magnet Assembly Ferrite Fe
Model No.:410mmX250mm
Specification:410mmX250mm Material: upper- Ferrite(24PCS) under- Fe magnetization direction: length Coating: null Character: two units, 12Pcs/unit, bonded together strong magnetic force. Working temperature is over 200℃ Application: Used in Wind turbine generator
China Sintered Hard Ferrite Magnets Suppliers
Hard Ferrite Magnets are manufactured from iron oxide and either barium carbonate or strontium carbonate. The raw materials are mixed in the correct proportions, granulated, and calcined (presintered). After going through several intermediate phases, a hexaferrite phase (BaFe12O19 or SrFe12O19) is achieved. The presintered granulate is ground to a powder. It can then be pressed wet or dry in a magnetic field (anisotropic) or in the absence of a magnetic field (isotropic) and sintered. Hard ferrites are ceramic materials, with the mechanical hardness and brittleness typical of ceramics. A typical way of processing them is by grinding with diamond discs.

Hard Ferrite magnets have excellent corrosion resistance and have normal operating capabilities between -40°C and +250°C. As temperature increases, remanence decreases by 0.2%/°C whereas coercivity increases by 0.3%/°C. At very low temperatures there is a risk of permanent demagnetization in magnet systems with low working points.