Product Category

Product 



1 Sintered NdFeB

0.0 Yuan 0.0 Yuan

NdFeB

Detail

High Performance NdFeB Professional Manufacturer in China

NdFeB Magnets - Neodymium Iron Boron magnets

Rare earth permanent magnet NdFeB (Neodymium-Iron-Boron) is a new kind of magnetic material developed in the 1980's with excellent magnetic characteristics (high energy product and high coercive force etc.) and relatively low cost. It is getting to replace the traditional magnets of hard ferrite, AlNiCo and SmCo in many fields such as electro-accoustic devices, electric motors, sensors/transducers, instruments and meters, auto industry, petro-chemical industry and magnetic health-care products etc.

NdFeB magnets are very powerful. They have a higher Maximum Energy Product, (BH)max, than SmCo magnets. (BH)max of NdFeB can easily reach 30 MGOe and even goes up to 52 MGOe. NdFeB magnets can replace SmCo magnets in most cases, especially where operating temperature is less than 80°C.

The temperature stability of NdFeB is not as good as SmCo magnets. Magnetic performance of NdFeB magnets will deteriorate rapidly above 200°C. Compared to SmCo magnets, the corrosion and oxidation resistance of NdFeB is relatively low. Therefore, A surface coating is usually applied on NdFeB magnets. Zinc or nickel coating is common used as a protective layer. Other materials such as gold, brass, tin or polymer (epoxy) are also used for this purpose.

Product Information

Produced by the powder metallurgical method with chemical composition of Nd2Fe14B
Very brittle and hard
Poorest corrosion resistance of all commercial magnetic material
High resistance to magnetic demagnetization
Excellent cost to performance ratio
Reasonable temperature stability
Not suitable for application which exposed to high temperatures

Uses include:

The following table below shows Neodymium in comparison with other magnet materials, for temperature limitation, maximum energy and cost.
Magnetic Material	Temperature -Deg.C		Max. Energy - MGOe		Relative Cost

Neodymium Iron Boron		80 - 200		50		33
Samarium Cobalt		350		30		100
Alnico		500		8		20
Ferrite		180		4.5		5

Magnetic rubber		50		0.8		10

Our most advanced technology:we can make two different series of sintered NdFeB magnets--- ordinary book mold alloy and magnets (HAST NdFeB) based on a strip cast alloy which gives a better chemical stability. We has invested in the production technology enabling to use strip cast material.

HAST NdFeB magnets have higher anticorrosion and can last for 7 days under 120 degree Celsius, 95% humidity and 2atmp with loss of weight less than 3mg/cm2.

Surface Treatments and Dimension Range/Nominal Tolerance of Sintered NdFeB Magnets (Neodymium Iron Boron)

Surface Treatments

Type	Information
Metallic	Zinc, Nickel, Nickel + Tin, Nickel + Copper + Nickel, Gold, Ag, Cr
Organic	Epoxy, Nickel + Epoxy coating
Temporary	Surface Passivation

Coating Test Standard of Nickel coating
(1).Salt Spray Test(SST):
Test condition :
Temperature:35C Degree,5% NaCl ,Continous spray for 24 hours.
Test Standard/Criterion:
Coating is good ,doesn’t get off,no bubbles,no dots.no rust appear.
(2)Pressure cooker Test (PCT):
Test condition :
121C and 95% RH and 2 atmosheric pressure, test for 24 hours
Test Standard/Criterion:
Coating does not Get off, there are no air bubbles or dots Appear

Magnetization Directions of Permanent Magnets