Product Details

Specifications

Rare earth magnet:
high magnetic surplus
high coercitive force
high performance / price ratio
diverse shape and size

Product Description

product name	Black epoxy good quanlity rare earth magnet
material	Bonded NdFeB
Grade	BN8H
Shape	Ring
Coating	Black epoxy
Coercivity	>600KA/m
BH(max)	44-56kj/m²
Dimensional tolerance	±0.05mm

The major features of NdFeB rare earth magnet are as follows:

1 High energy product: as high as 50MGOe is consistently available. This value of the maximum energy product exceeds that of the best SmCo magnets.

2 Low density of NdFeB: allows lighter and smaller designs for magnetic circuits. The density of NdFeB is 7.5g/cm³ and is more than 10% smaller than that of SmCo magnets.

3 Its mechanical strength: enables easier machining and handling than SmCo magnets. The bending strength and the tensile strength of NdFeB are approximately twice those of SmCo magnets.

4 No future’s concern of raw materials: NdFeB rare earth magnet is made of neodymium, iron and boron, which are abundant on the earth.

5 NdFeB has a larger corrodibility than SmCo magnet under a high-temperature and high-humidity environment. Surface coating is necessary to protect NdFeB against corrosive atmosphere.

6 NdFeB Rare earth magnet has the larger temperature coefficients of the remanent magnetization (Br) and the coercivity (Hcj) than SmCo magnets. A careful consideration for working temperature and permeance is required on designing fabrication processes of a magnetic circuit for a full utilization of NdFeB’s high performance. NdFeB with high coercivities are large as 35KOe has been developed to offer an improved stability at high temperatures.

7 High price/performance ratio; the strongest attractive force.

8 Lower temperature coefficient: the routine NdFeB magnet’s temperature coefficient (βHcj) is -0.6%/°C, to improve this, we have developed the temperature coefficient (βHcj) -0.5%/°C to make NdFeB have good stability of temperature, and then could be applied into more fields.

Low weight Loss NdFeB Rare earth magnets

Because there is Nd-rich phase and iron-base in NdFeB magnet, and it is easy to be oxygenated and corroded, which restrict application in some fields, such as the motor of elevator, wind-drive generator, methane generator, and so on. To improve it, we developed the low weight loss magnets.

At present, the best low weight loss magnets we could produce are as follows:

132.9°C, 2.9atm and 95%-100% moisture for 168 hours, the weight loss is less than 2mg/cm². Certainly, real weight loss could differ according to the dimension of magnets.

This kind of low weight loss magnets could enhance the anti-corrosion resistance, and prolong the longevity, and decrease the cost of maintenance.

About the properties of low weight loss magnets, we could produce them as per our customer’s requirement.

Application Fields:

Wind power generator	Stepping motor	Textile machine	MRI	Sensor	electronics
Magnetic eddy current separator	Magnetic assemblies	Magnetic tools	Chuck	Loudspeaker	microphone
Instrument & meter	Medical equipment	Selector	Bearing	Printer	converter
V.C.M(Voice coil motor)	Servo motor	Brushless motor	Coupling	Aviation	automobile

Detailed information:

The properties: Please kindly check our properties chart for the detailed information on the top of the page.

The dimension and tolerance: We could control the tolerance within ±0.05mm. If our customers have special request on the dimension and tolerance, we will try our best to meet their requirements.

The coating:To protect the magnets, we generally treat NdFeB magnets with the following coatings: