Ceramic (Ferrite) Magnet Material Overview

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Ceramic (Ferrite) Magnet Material Overview
Ceramic (Ferrite) magnets were formulated in the 1950s by Phillips in Holland. The major raw material used to manufacture ferrite magnets is very inexpensive; iron oxide, more commonly known as "rust"! Due to their low cost, ceramic magnets are the most commonly used permanent magnets even today.

A special form of ferrite magnets is produced using a flexible binder for the ferrite powder. These materials are commonly referred to as "Flexible Magnets".

Integrated Magnetics designs and builds custom technical ceramic magnets and magnetic assemblies, manufactured to meet your specialty requirements. Send us a request for quote or contact us today for more information about standard or custom neo magnets. Large inventory of neodymium magnets are also available for on-line purchase at MagnetShop.com.

Key Benefits
  • Inexpensive yet strong; a good balance between strength and affordability.
  • Does not demagnetize easily.
  • Can be magnetized with multiple poles if necessary.
  • Does not rust.
Key Challenges
  • Hard and brittle.
  • Properties degrade linearly with temperature. At 350°F (177°C), about 75% of room temperature magnetization is retained, and at 550°F (288°C), about 50% is retained.
Quick Facts
  • Density: 0.180 lbs. per cubic inch.
  • Saturation magnetizing field required: about 10kOe.
  • Manufacturing methods: sintering (most common), injection molding, extruding or calendering (the last 3 methods when the material is combined with a carrier). Fully dense sintered ferrite magnets can be wet or dry pressed (wet pressing leads to higher magnetic properties).
  • Available Shapes: blocks, bars, discs, rings, arc segments, etc.
  • Available Grades: from 0103 to 0404. (First 2 digits represent BHmax; second two digits represent Intrinsic Coercivity, or Hci).
  • Sizes: sintered ferrite magnets can be manufactured in blocks up to approximate 10" x 4" x 1". Extruded ferrite (otherwise known as flexible magnets) can be extruded in unlimited lengths. However, the energy product of flexible magnets is much lower than that of fully dense, sintered ferrite magnets.
Surface Treatments
  • No surface treatments are necessary for ceramic magnets since they are essentially inert and do not oxidize. However, they can be coated with various epoxy coatings for cleanliness purposes.
CAUTION!
  • Ferrite materials are very hard and brittle and will shatter if dropped; special care must be taken when handling these magnets.

 
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