BH-demagnetazation Curve of NdFeB, Grade N50

[AEW]

Is there a trusted literature source (material handbook) where someone can find the BH-demagnetazation curve of the Neodymium Iron Boron (NdFeB) permanent magnet, grade N50?

What is the difference between sintered and bounded magnet?
A BH-demagnetazation curve correspond to which one?

What exactly is the grade of a magnet and what defines it?

 

[MagMike]

What is wrong with the demagnetization curves on a supplier's webpage? As long as you are dealing with reputable vendors, N50 from Vendor A will be the same as Vendor B.

You will find 2 or 3 variations on N50 since it can be produced with different intrinsic coercivities. But again, deal with reputable suppliers.

Sintered means the magnet was sintered to produce the magnet.
Bonded means they supplier took sintered material and mixed it ('bonded' it) with an epoxy.

The grade of the magnet is commonly described by the energy product. To use your example, N50 would be fully sintered Neodymium Iron Boron magnet with an energy product of 50 MGOe.

 

[Clyde38]

Magnet vendors will often supply this form of data. For example:

http://www.electronenergy.com/products/demagnetization-curves/N50.pdf

As for the difference between sintered and bonded NdFeB, do a little research, such as:

http://www.magnetsales.com/Neo/Neo1.htm#generalinfondfeb

Much, if not all of the information you seek is available from various magnet vendors online, for instance:

http://www.dextermag.com/

 

[EdStainless]

There is also reference data in the MMPA handbook.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[MagBen]

50 in N50 means energy products = BxH = 50 MGO, it must be sintered, bonded magnets have a much lower energy products.

There are normally 3 types of Neo magnets with 50 MGOe:
N50: intrinsic coercivity Hci > 12 KOe operating max temp 80C
N50M: Hci>14kOe, max temp 100C
N50H: Hci>16Koe, max temp 120C.
no SH, UH, EH version (Hci even higher), since with increase in Hci, the Br must be sacrified, and you cannot get a 50MGOe.

you need to see both intrinsic and normal B-H curves to evaluate the magnet, the normal curves for all N50, N50M, and N50H look similar.