Hard Ferrite Magnets, Ceramic Magnets

Selectable sizes:

 

Disc / Cylinder Magnet	Diameter (mm)	Thickness (mm)
Maximum	220	40
Minimum	1.2	0.5
Tolerance	±0.2	±0.1

Segment & other irregular shapes can be manfactured according to customer's sample or drawing/blue print

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Magnetic Properties of Hard Ferrite (Ceramic) Magnets
 

Ferrite Permanent Magnets Resources

Introduction

Ferrites represent a kind of chemical compounds composing the formula AB₂O_4, wherein A and B indicate different metal cations (with less electrons, more protons) having iron content. Ferrites are referred to as ceramic materials that are applied in various fields from magnetic components to micro-electronics.

Hard magnets (or ferrite permanent magnets) are considered as magnetic materials whose magnetism is maintained once they are magnetized. This concludes that such materials possess an intrinsic coerciveness of more than ~10kAm^-1. 

Foundation

Ferrite permanent magnets have been into inception since 25,000 BC, when it was being used by compasses by the Chinese. In the early 20^th century, high carbon steels and tungsten or chromium comprising steels replaced lodestone were recognized as the most eligible ferrite permanent magnet materials, owing to the pinning of domain walls because of dislocations and inclusions. Often the movement of dislocations inside a material gets affected due to frequent hindrance by the same factors affecting the motion of domain walls. As a result, these steel materials become mechanically very hard, and hence, the terminology ‘magnetic’. Ferrite permanent magnets possessed an energy product of around 8kJm^-3.

Application

There has been witnessed a tremendous rate of growth in the manufacturing of RE-Magnets in the face of frequent fluctuations in the world economy as a whole. While the growth rate of sintered NdFeB magnets has been standing at 12%, the growth rate of bonded NdFeB magnets is more than 20%. The total value of hard magnets normally goes beyond the total value of soft magnets. There is a wide gap reported between the two values, reason partially being the booming global PC market. This is because about 60% of NdFeB magnet production is applied in disc-drive fields, especially Voice-Coil-Motors (or VCMs). 

Significance

Ferrite permanent magnets enjoy much significance in today’s market than it is actually realized, especially for its widely known application in motor cars. During the early 50s, a car used to have only one magnet, called the Speedometer. Today, every car can avail more than hundred ferrite permanent magnet motors. At present, these are purely based on Sr-ferrite (SrFe₁₂0₁₉). NdFeB magnets penetrated into this area demand a considerable reduction in cost, a rise in the maximum operating temperature and enhancement of corrosion resistance. The most significant benefits arising out of NdFeB magnets usage are volume reduction, weight reduction and improved efficiency levels, which further instigates the usage of ferrite permanent magnets in the years to come.