2015年3月25日星期三
Magnets are everwhere.
Just find a disc neodymium magnet with countersunk at the door, magnets are everywhere in our daily life.
2015年3月20日星期五
Comparison among different magnetic materials
The most used magnetic materials sintered NdFeB magnets, SmCo Magnets,
AlNiCo magnet and Ceramic magnets are compared from different aspects as
follows:
Prices:
SmCo magnets the most expensive, Sintered NdFeB magnets the second and the cheapest is Cermaic magnets;
Intrinsic coercive force:
SmCo almost equal sintered NdFeB magnets in the highest Hcj value, the Hcj of Ferrite magnets is the lowest;
Max product energy:
SmCo magnets reach 32 MGOe but Sintered NdFeb can reach 52MGOe;
Max working temp:
AlNiCo won the first place so it is mostly used in meters, SmCo reach to 350 degrees, while NdFeB only up to 230 degrees;
and machinability:
As Neodymium magnets and SmCo magnets are very fragile, they are limited in machinability. Ferrite magnets are mostly moulded and cut without that much machining like other magnetic materials.
Prices:
SmCo magnets the most expensive, Sintered NdFeB magnets the second and the cheapest is Cermaic magnets;
Intrinsic coercive force:
SmCo almost equal sintered NdFeB magnets in the highest Hcj value, the Hcj of Ferrite magnets is the lowest;
Max product energy:
SmCo magnets reach 32 MGOe but Sintered NdFeb can reach 52MGOe;
Max working temp:
AlNiCo won the first place so it is mostly used in meters, SmCo reach to 350 degrees, while NdFeB only up to 230 degrees;
and machinability:
As Neodymium magnets and SmCo magnets are very fragile, they are limited in machinability. Ferrite magnets are mostly moulded and cut without that much machining like other magnetic materials.
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