Permanent Magnet Material

Introduction to permanent magnet material :

What is Magnet ?

Answer  :  A magnet is a material or object that produces a magnetic field.

What is Permanent Magnet?

Answer : A piece of magnetic material that retains its magnetism after it is removed from a  external magnetic field.

A most common example is refrigerator magnet  which holds the refrigerator door this is because it creates  own persistent magnetic field.

There are different types of permanent magnets with  different characteristics or properties which mainly emphasis on how easily they can be demagnetized, how strong they can be, how their strength varies with temperature . I like to share this Permanent Magnet Definition with you all through my article.




Permanent magnet materials:


1).Neodymium Iron Boron (NdFeB or NIB) :

a).Neodymium Iron Boron (NdFeB) is a type of rare earth magnets.

b).It has very high strong magnetic field and therefore used in compact high strength material where price a not a factor.

c).NdFeB magnets are highly corrosive.

Merits :

Very high energy product
High coercive
Demerits :

Higher cost
Low mechanical strength
Low corrosion resistance
2) Samarium Cobalt (SmCo):

a) Samarium cobalt is also  type of rare earth magnets.

b) It is highly resistant to oxidation.

c) It is higher magnetic strength and temperature resistance than Alnico and ceramic material.

Merits :

High temperature stability
High energy product
High corrosion resistance
Demerits:

Low mechanical strength
High cost
3) Alnico:

a) Alnico magnets are the combination of aluminium ,nickel, cobalt , iron and with small amounts of other elements which increase the properties of the magnet.

b) Alnico magnets are made by two methods :
1.Casting  : Delivers higher magnetic field and allows for the design of     complex and difficult shapes.
2. Sintering : It offers superior mechanical characteristics.

Merits :

High mechanical strength
High temperature stability
High corrosion resistance
Demerits :

High cost
Low energy product

Having problem with Kinetic Energy Formulas keep reading my upcoming posts, i will try to help you.

More Permanent magnet materials:


4) Flexible :

a) By using a flexible resin or binder such as vinyl  , it is similar to injection molded megnets.

b) It is produced in flat strips , shapes or sheets.

c) It can be very flexible and can be used in industrial printers.

Merits :

Low cost
High corrosion resistance
Moderate corecive force
Demerits :

Low energy product
Low to medium temperature stability.
5) Injection Molded :

a) It has composition  of various types of resin and magnetic powders.

b) The physical and magnetic properties depend on the raw material used.

c) It is generally lower in magnetic strength.

Merits :

High corrosion resistance
Moderate energy product
Demerits :

High cost
Low temperature stability.

6) Ceramic or Ferrite :  Ceramic or ferrite magnets are made of sintered having composition of iron oxide and barium or strontium carnonate.

Merits :

Low cost
High resistance to corrosion
High Coercive force
Demerits :

Low energy product
Low mechanical strength