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Axestone Magnet Supplies

　

Sintered NdFeB Magnet

　

Max. Property of Neodymium magnet: N52, N45M, N45H, N42SH,N33EH, N35UH
Coated with Zn, NiCuNi, Epoxy,Teflon, Phosphated, Gold and Silver, etc... please visit coating of sintered NdFeB magnet

　

Coating quality is crucial to the operation of the sintered NdFeB magnets, especially in the usage of VCM, motor, loudspeaker and sensor. Besides the strict control of the coating process, the following methods are worked to test the quality.

Coating layer thickness measurement. The standard thickness is 15～20um for Zn coating layer, and total 15～20um for NiCuNi coating (first Ni layer 7～8um; second Cu layer 5～6um; the outer
Ni layer 4～5um).

Adhesive force test. Heat the coated sample to the stipulated temperature, take one hour (300℃ for NiCuNi; 200℃ for Zn), and put it into water. No break occurs after quenching.

Salt spray test. The standard lasting time for the different coating is as followed (hours).

Coating	Zn	Color Zn	Ni	NiCuNi	Phosphated
Salt spray test	48h	72h	48h	96h	16h

　

Magnetic & Material Characteristics

Type	Residual Flux Density (Br)	Coercive Force (Hcb)	Inrtinsic Coercive Force (Hcj)	Max.Energy Product (BH)max	Max.OPerating temp （℃）
N35	11.7-12.1KGs	10.8-11.5Koe	≥12Koe	33-35MGOe	≤80
N38	12.2-12.6KGs	10.8-11.5Koe	≥12Koe	36-38MGOe	≤80
N40	12.6-12.9KGs	10.5-11.0Koe	≥12Koe	38-40MGOe	≤80
N42	12.9-13.2KGs	10.5-11.0Koe	≥12Koe	40-42MGOe	≤80
N46	13.3-13.8KGs	10.5-12.5Koe	≥11Koe	43-47MGOe	≤80
N35M	11.7-12.1KGs	10.8-11.5Koe	≥14Koe	33-35MGOe	≤100
N38M	12.2-12.6KGs	10.8-11.5Koe	≥14Koe	36-38MGOe	≤100
N40M	12.6-12.9KGs	10.8-11.5Koe	≥14Koe	38-40MGOe	≤100
N42M	12.9-13.2KGs	10.8-11.5Koe	≥14Koe	40-43MGOe	≤100
N35H	11.7-12.1KGs	10.8-11.5Koe	≥17Koe	33-35MGOe	≤120
N37H	12.1-12.6KGs	11.5-12.0Koe	≥17Koe	35-37MGOe	≤120
N41H	12.5-13.3KGs	11.9-12.7Koe	≥16Koe	38-42MGOe	≤120
N33SH	11.4-11.7KGs	10.3-11.0Koe	≥20Koe	31-33MGOe	≤150
N35SH	11.7-12.1KGs	10.8-11.5Koe	≥20Koe	33-35MGOe	≤150
N38SH	12.2-12.9KGs	11.6-12.6Koe	≥21Koe	36-40MGOe	≤150
N28UH	10.4-11.0KGs	9.8-10.4Koe	≥25Koe	26-30MGOe	≤180
N33UH	11.1-11.9KGs	10.5-11.5Koe	≥25Koe	30-34MGOe	≤180
N32EH	11.1-11.9KGs	10.5-11.5Koe	≥27Koe	30-34MGOe	≤200

Physical Property

No	Temp..Coefficient αBr	Density Dc	Cuire Temp D	Recoil Permeability μrec	Product type
No	%/℃	g/cm³	℃	Recoil Permeability μrec	Product type
1	-0.12	7.4-7.5	310	1.1	N
2	-0.1	7.4-7.5	340	1.1	NH NSH
3	-0.1	7.4-7.5	350	1.1	NUH、NEH、NZ

Any shapes of magnets such as block, cylinder, ring, segment and irregular shapes ,etc.. can be supplied according to customers' requirements.

　

　

Demagnetozation Curve

32EH

38SH

41H

N46

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