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Sintered NdFeB

Sintered NdFeB magnets are currently commercially available mass-produced permanent magnetic materials also known as neodymium magnets, is formed by neodymium, iron, boron, tetragonal crystal system crystals, is a high energy density of energy storage, can be highly efficient to achieve the energy and information of the mutual conversion of energy and its own energy is not consumed. Ultra-high energy density NdFeB permanent magnet materials to promote science and technology and information industry to integrated, thin, ultra-miniaturized, lightweight, intelligent development. Sintered NdFeB magnets are the most commonly used rare earth permanent magnet materials.

Sintered NdFeBTable of Magnetic Properties

Thermal demagnetization state L/D=0.7 permanent magnet cylindrical samples (diameter D, orientation height L), saturated magnetization, in the open-circuit state, heated from room temperature to a constant temperature humidification 2h, and then cooled to room temperature, its open-circuit flux is not reversible flux loss ≤ 5% of the maximum humidification temperature.

Grade	(Br)KGs	(Hcb)KOe	(Hcj)KOe	(BH)maxMGOe	Hk/Hcj	(T)℃
N33	11.4~11.8	≥10.5	≥12	31~35	≥95	80℃
N35	11.8-12.3	≥11	≥12	33~37	≥95	80℃
N38	12.3~12.7	≥11.2	≥12	36~40	≥95	80℃
N40	12.7~12.9	≥11.4	≥12	38~42	≥95	80℃
N42	12.9~13.3	≥11.5	≥12	40~44	≥95	80℃
N45	13.3~13.7	≥11.6	≥12	43~47	≥95	80℃
N48	13.7~14.0	≥11.6	≥12	45~49	≥95	80℃
N50	13.9~14.2	≥11.4	≥12	48~52	≥95	80℃
N52	14.2~14.5	≥10.2	≥11	49~53	≥95	80℃
N54	14.4 14.8	≥10.2	≥11	50~54	≥95	80℃
35M	11.8~12.3	≥10.9	≥14	33~36	≥95	100℃
38M	12.3-12.6	≥11.5	≥14	36~40	≥95	100℃
40M	12.6~12.9	≥11.8	≥14	38~42	≥95	100℃
42M	12.9 13.3	≥12.0	≥14	40~44	≥95	100℃
45M	13.3~13.7	≥12.5	≥14	43~46	≥95	100℃
48M	13.6~14.0	≥12.9	≥14	45~49	≥95	100℃
50M	13.9~14.2	≥13	≥ 14	47~51	≥95	100℃
52M	14.2~14.6	≥12.5	≥13	49~53	≥95	100℃
35H	11.8~12.3	≥11	≥17	33~37	≥95	120℃
38H	12.3~12.6	≥11.4	≥17	36~40	≥95	120℃
40H	12.6~12.9	≥11.7	≥17	38 ~42	≥95	120℃
42H	12.9~13.3	≥12.0	≥17	40 ~44	≥95	120℃
45H	13.3~13.7	≥12.5	≥17	43~47	≥95	120℃
48H	13.7~13.9	≥12.8	≥16	45 ~49	≥95	120℃
50H	13.9~14.2	≥12.9	≥16	47~51	≥95	120℃
52H	14.2~14.5	≥12.8	≥16	48 ~53	≥95	120℃
33SH	11.4~11.9	≥10.5	≥20	31~35	≥92	150℃
35SH	11.8-12.3	≥11.2	≥20	33~37.5	≥92	150℃
38SH	12.3~12.6	≥11.3	≥20	36.5~40	≥92	150℃
40SH	12.6~12.9	≥11.8	≥20	38~41	≥92	150℃
42SH	12.9~13.3	≥12.4	≥20	40~44	≥92	150℃
45SH	13.3~13.7	≥12.5	≥20	43~46	≥92	150℃
48SH	13.7~14.0	≥12.8	≥20	45~49	≥92	150℃
50SH	13.9~14.2	≥12.9	≥20	47~51	≥92	150℃
52SH	14.2~14.5	≥12.8	≥19	48~53	≥92	150℃
30UH	10.8~11.4	≥9.5	≥25	28~32	≥90	180℃
33UH	11.4~11.8	≥10.3	≥25	31~34	≥90	180℃
35UH	11.8~12.3	≥10.6	≥25	33~37	≥90	180℃
38UH	12.3~12.6	≥11.1	≥25	36~39	≥90	180℃
40UH	12.6~12.9	≥11.5	≥25	38~41	≥90	180℃
42UH	12.9~13.3	≥11.8	≥25	40~43	≥90	180℃
45UH	13.3~13.7	≥12.2	≥24	43~46	≥90	180℃
48UH	13.7~14.2	≥12.5	≥24	45~49	≥90	180℃
50UH	13.9~14.3	≥12.8	≥24	47~51	≥90	180℃
52UH	14.2~14.5	≥13.1	≥24	48~53	≥90	180℃
30EH	11.0~11.4	≥9.5	≥30	28~31	≥90	200℃
33EH	11.4~11.8	≥10.3	≥30	31~34	≥90	200℃
35EH	11.8~12.2	≥11.1	≥30	33~36	≥90	200℃
38EH	12.2~12.5	≥11.6	≥30	35~39	≥90	200℃
40EH	12.5~12.8	≥11.9	≥30	37~41	≥90	200℃
42EH	12.8~13.1	≥12.2	≥29	39~43	≥90	200℃
28TH	10.5~10.8	≥9.5	≥35	26~29	≥90	230℃
30TH	10.8~11.4	≥10.1	≥35	28~31	≥90	230℃
33TH	11.4~11.8	≥10.2	≥35	31~34	≥90	230℃
35TH	11.8~12.2	≥10.6	≥35	33~36	≥90	230℃
38TH	12.2~12.5	≥11.6	≥33	35~39	≥90	230℃

Physical parameters and plating

Sintered NdFeBPhysical properties of materials

Curie temperature

310～380 ℃

Reverse permeability

1.02～1.05

Temperature coefficient of remanence

-0.09～-0.13 %/℃

Temperature coefficient of endowed coercivity

-0.4～-0.7 %/℃

Densities

7.50～7.70 g/cm³

Vickers hardness

550～700

Bending strength

-0.09～-0.13 MPa

Tensile strength

≥80 MPa

Compressive strength

800 ~1050 MPa

Resistivity

150 μΩ·cm

Thermal conductivity

8～10 W/(M·℃)

Coefficient of thermal expansion Parallel to direction

5 10-6/K

Coefficient of thermal expansion Perpendicular to direction

-1.5 10-6/K

Young's modulus

150～200 GPa

Specific heat

3.0 ~ 4.6 J/(g·k)

Weightlessness (low weightlessness products)

≤2 mg/c㎡

Physical properties of surface treatment and use environment

Kind	Surface Colors	Physical property	Operating environment	Coating thickness
Zinc plating	Blue and white, black, rainbow colors, etc.	Dense, stable and uniform surface	High corrosion resistance	6um≤∮≤12
Electroplated nickel-copper-nickel	Silver White, Black	The plating has a metallic luster, uniform color and clean surface.	For use in more demanding environments	15μm≤∮≤30pm
Phosphide	Light gray	Uniform thickness	Slightly rustproof
Epoxy	Black, gray, some gloss	Uniform coating, insulation	For use in more demanding environments	≥15μm
Paraline Coating	Open (non-secretive)	Uniform thickness, dense, no pinholes, insulation	Suitable for extremely demanding environments	0.1μm≤∮≤100pm
Nickel + Copper + Epoxy	Black	Uniformity of coating, insulation, stability	Suitable for use in extremely harsh environments Salt spray >300hr	10-30μm
Aluminum + Epoxy	Black	Uniformity of coating, insulation, stability	Suitable for use in extremely harsh environments Salt spray resistant >650hr Suitable for new energy cycling automotive products	15-35μm

Demagnetisation curve

48H

40SH

38UH

35EH

Size & Appearance

Sizes

1, Size tolerance: length, width, thickness, diameter, etc. (tolerance range is generally not less than ± 0.05mm).
2, Shape and position tolerance: perpendicularity (≤ 0.8 °), parallelism (≤ 0.05mm), ellipticity (≤ 0.05mm), concentricity (≤ 0.05mm) and so on.
If the customer has requirements, the standard will be implemented according to the standard confirmed after negotiation with the customer.

Appearance

Surface cleanliness (e.g., watermarks, color), degree of breakage (zinc loss, corner loss, knocked edges, black leather), cracks, sandholes, knife lines, etc.

Square Products

Size range	Dimensional tolerances	Parallelism	Perpendicularity
L≤10	±0.03	0.04	Neighboring surface degree to 0.5
10<L≤25	±0.03	0.06
25<L≤63	±0.04	0.10
L>63	±0.06	0.12

Cylindrical products

Size range	Dimensional tolerances	Parallelism	Perpendicularity
L≤10	±0.03	0.04	Neighboring surface degree to 0.5
10<L≤25	±0.03	0.06
25<L≤63	±0.04	0.10
L>63	±0.06	0.12

Tile Products

Size range	Dimensional tolerances	Parallelism	Perpendicularity
L≤10	±0.03	0.04	Neighboring surface degree to 0.5
10<L≤25	±0.03	0.06
25<L≤63	±0.04	0.10
L>63	±0.06	0.12

Circular Products

Size range	Dimensional tolerances	Parallelism	Perpendicularity
L≤10	±0.03	0.04	Neighboring surface degree to 0.5
10<L≤25	±0.03	0.06
25<L≤63	±0.04	0.10
L>63	±0.06	0.12

Square Products

Cylindrical products

Tile Products

Circular Products

Other features

Magnetization method

Whether to magnetize the delivery, whether to charge, have special requirements according to customer requirements magnetization

Marking requirements

Polarity is marked or not, if required, according to the customer's requirements Marking

Packaging materials and methods

General use of kraft paper, foam board and carton packaging, special cases of vacuum packaging and shielding packaging, the weight of each box is less than 20Kg, MRI products are shipped on pallets. Customers have special requirements according to customer requirements packaging

Accompanying documentation

Certificate of Conformity, Sales Inspection Report, Sales Blank Inspection Report (including appearance, dimensions, density, endowment magnetic properties and demagnetization curve, etc.)