Sintered NdFeb Magnets

Sintered NdFeB Rare Earth Magnets is a kind of functional material that is necessary for basic industry and frontier science. In order to keep up with the rapid developing trend of NdFeb rare earth magnets production and application in the world, the factory backed by its year’s professional experience andconvenient well-situated facility, continuously promotes the development and production in the field.NdFeB magnet is mainly made of Neodymium Iron and Boron,with excellent magnetic property abundant raw material and reasonable prices, NdFeB Magnet can be used as an ideal magnet in mini-motor Permanent magnetic resonance sound device magnetic suspension system,magnetic transmission machine and iatrical apparatus and etc.For NdFeB,its surface is usually treatd with some special methods.The surface treatment method include Zine Nickel Tin Silver Gold plating Phosphor and Spray Epoxy Resin etc.

Wide Applications With its excellent magnetic property,abundant raw material and reasonable prices, rare-earth permanent magnet can be used as an ideal magnet in mini-motor, permanent-magnet instrument,electronic industry, auto industry, petro-chemical industry,nuclear magnetic resonance,sound device, magnetic suspension system, magnetic transmission machine and magnetotherapy apparatus etc.

NdFeB magnets Chemical composition: Chemical analysis for sintering NdFeB magnets material based on intermetallic compounds RE2Fe14B,main composition is NdFeB magnet is(RE), (Fe) (B),thereinto thulium (Nd), in order to obtain different performance can instead by thulium of (Dy),(Pr) etc. also other metal can instead Fe,for example (Co), (Al) etc., smaller content of boron,but it affect tetragonal crystal intermetallics, making the intermetallics with high magnetization,uniaxial anisotropy and curie temperature.
NdFeB Magnets Making process: NdFeB magnet use Powder Metallurgy Process, proportion of material such as: neodymium, dysprosium, iron, cobalt, niobium, praseodymium,aluminum, iron, and boron etc., through Mid-frequency Induction Furnace smelting to alloy steel ingot, then broken into power of 3~5um,and forming mold in magnetic field, the green bodies sintering dense and tempering in Vacuum Sintering Furnace, that can earn magnetic properties of blank of permanent magnet. After grinding, drilling, cutting and other processing, last via surface finish, it is good NdFeB magnet.
 Physical properties of Sintered NdFeB Magnets.

Type /Grade	Residual induction Br(KGs)	Coercive Force bHc(KOe)	Intrinsic coercive Force iHc(KOe)	Squareness (Hk/iHe)	Max. Energy Product (BH)max.(MGOe)	Max. Operating Temp.(°C)
N27	10.3-10.8	≥10.0	≥12	≥0.85	25-29	80
N30	10.8-11.3	≥10.0	≥12	≥0.85	28-31	80
N33	11.3-11.7	≥10.5	≥12	≥0.85	31-34	80
N35	11.7-12.3	10.7-12.0	≥12	≥0.85	33-36	80
N38	12.1-12.7	11.1-12.4	≥12	≥0.85	36-39	80
N40	12.5-13.2	11.5-12.8	≥12	≥0.85	38-41	80
N42	12.9-13.5	11.5-13.2	≥12	≥0.85	40-43	80
N45	13.3-13.9	11.5-13.6	≥11	≥0.85	43-46	80
N48	13.7-14.3	11.5-14.0	≥11	≥0.85	46-49	80
N50	14.1-14.9	11.5-14.0	≥11	≥0.85	49-51	80
33M	11.3-11.9	10.3-11.6	≥14	≥0.85	31-33	100
35M	11.7-12.3	10.7-12.0	≥14	≥0.85	33-36	100
38M	12.1-12.7	11.1-12.4	≥14	≥0.85	36-39	100
40M	12.5-13.2	11.5-12.8	≥14	≥0.85	38-41	100
42M	12.9-13.5	11.9-13.2	≥14	≥0.85	40-43	100
45M	13.3-13.9	12.3-13.6	≥14	≥0.85	43-46	100
48M	13.7-14.3	12.8-14.1	≥14	≥0.85	46-49	100
30H	10.9-11.5	9.9-11.2	≥17	≥0.85	28-31	120
33H	11.3-11.9	10.3-11.6	≥17	≥0.85	31-34	120
35H	11.7-12.3	10.7-12.0	≥17	≥0.85	33-36	120
38H	12.1-12.7	11.1-12.4	≥17	≥0.85	36-39	120
40H	12.5-13.2	11.5-12.8	≥17	≥0.85	38-41	120
42H	12.9-13.5	11.9-13.2	≥17	≥0.85	40-43	120
45H	13.3-13.9	12.5-13.8	≥17	≥0.85	43-46	120
27SH	10.5-11.1	9.5-10.8	≥20	≥0.85	25-28	150
30SH	10.9-11.5	9.9-11.2	≥20	≥0.85	28-31	150
33SH	11.3-11.9	10.3-11.6	≥20	≥0.85	31-34	150
35SH	11.7-12.3	10.7-12.0	≥20	≥0.85	33-36	150
38SH	12.1-12.7	11.1-12.4	≥20	≥0.85	36-39	150
40SH	12.5-13.2	11.5-12.8	≥20	≥0.85	38-41	150
42SH	12.9-13.5	11.9-13.2	≥20	≥0.85	40-43	150
25UH	10.1-10.7	9.1-10.4	≥25	≥0.85	23-26	180
27UH	10.5-11.1	9.5-10.8	≥25	≥0.85	25-28	180
30UH	10.9-11.5	9.9-11.2	≥25	≥0.85	28-31	180
33UH	11.3-11.9	10.3-11.6	≥25	≥0.85	31-34	180
35UH	11.7-12.3	10.7-12.0	≥25	≥0.85	33-36	180
38UH	12.1-12.9	11.1-12.6	≥25	≥0.85	36-39	180
40UH	12.5-13.3	11.5-13.0	≥25	≥0.85	38-41	180
23EH	9.7-10.3	8.7-10.0	≥30	≥0.85	21-24	200
25EH	10.1-10.7	9.1-10.4	≥30	≥0.85	23-26	200
27EH	10.5-11.1	9.5-10.8	≥30	≥0.85	25-28	200
30EH	10.9-11.5	9.9-11.2	≥30	≥0.85	28-31	200
33EH	11.3-11.9	10.3-11.6	≥30	≥0.85	31-34	200
35EH	11.7-12.3	10.7-12.0	≥30	≥0.85	33-36	200
38EH	12.1-12.9	11.1-12.6	≥30	≥0.85	36-39	200

1. The above-mentioned data of magnetic parameters are given at room temperature.
2.The above-mentioned grades are our basic grade. We also have T (for instance 35SHT, etc.) and L-T (for instance L-38SHT, etc.) series grades which are derived from these basic grades. The main properties of the derived grades are corresponding to those of the basic grades.
3. The max working temperature,which the sampling specification(Permanent Magnet:φ10×7) to heat up to the regular temperature for lay of long time(general 1000H.).   Then take this sampling to cooling attained  room temperature.The irreversible loss of magnetic flux is less than 5%,This max keep temperature definiteness which is the permanent material should be acception by the max temperature. The sign:Tw,The unit:K or ℃ The maximum working temperature of magnet is changeable due to grade, operating point, coating and environmental factors.

Physical Properties of Sintered NdFeB Magnet

Temp.Coeff.Of Br:-0.11%/°C
Density:7.4g/cm 3
Vickers Hardness:600Hv
Tensile Strength:8.0kg/mm 2
Specific Heat:0.12k Cak(kg°C)
Young’s Modulus:1.6×10 11 N/m 2
Poisson’s Ratio:0.24
Curie Temperature:310-340°C
Electrical Resistivity:144O.cm
Flexural Strength:25kg/mm 2
Coeff.of Thermal Expansion:4×10 -6 /°C
Thermal conductivity:7.7cal/m.h.°C
Rigidity:0.64N/m 2
Compressibility:9.8×10 -12 m 2 /N
Temp.Coeff.Of iHc:-0.60%/°C

Surface Treatment
The corrosion resistance  of NdFeB is considered poor. Painting, coating, or plating is therefore highly recommended for neodymium magnets for sale. Plating NdFeB is a difficult process, and commercial plating plants are unlikely to be able to achieve plating with good adhesion. Nickel, Zinc, or Tin plating provides good corrosion resistance for NdFeB magnets. We are also able to make cadmium
chromate or aluminum chromate as NdFeB coating by using vacuum deposition techniques. A variety of organic coatings have also been successfully developed for NdFeB, exhibiting good corrosion resistance characteristics. Especially in harsh environments, it may be advisable to use a combination of coating techniques, or to encapsulate the material in a sealed housing.

Magnetizing and Handling

All neodymium magnets for sale require extremely high magnetizing fields and special consideration must be given to this when designing complex assemblies, if it is intended to magnetize after assembly. We will recommand right magnetic direction for you in
accord with your requirements.Rare Earth materials are mechanically weak, and magnetically very strong. They must therefore be handled very carefully to avoid damage and injury during personnel handling the magnets. Receiving and assembly personnel should be warned about the of handling magnetized Rare Earth magnets.

Dimension Range of Sintered NdFeB:
	Length (OD) mm		Width (ID) mm		Thickness mm
	Min.	Max.	Min.	Max.	Min.	Max.
Block	1	150	1	100	0.5	150
Ring	1	150	1	140	0.6	50
Disc/Bar	1	150			0.6	50
	Length		Chord Length
	Min.	Max	Min.	Max.
Segment	3	50	5	150

If you need magnets with any special shape and dimensions , please feel free to contact us and we will try to help you.Eguiped automatic machining eguipments,We will supply customers all shapes of magnets according to customer’s reguirement.