1. General
1.1 The different types of permanent magnets
As mentioned in
These four families are, in order of appearance: Alnico, hard ferrites, samarium-cobalt and neodymium-iron-boron.
Alnico alloys based on aluminum, nickel, cobalt and iron first appeared in the 1930s. Today, they are used less and less, due to their modest magnetic properties and the high cost of cobalt. Thanks to their excellent thermal stability, they still have a few rare applications, in the high-temperature sector and on the measuring equipment market....
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General
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Economic data
1. Worldwide production
The permanent magnet market was estimated at US$4.4 billion in 1998, over US$5 billion in 2000 and US$8 billion in 2007. It should continue to grow, reaching US$11 billion in 2010.
With their modest magnetic performance but low cost, ferrites remain the magnet family that dominates the world market, both in terms of tonnage (90%) and sales (around half of the global...
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