NdFeB Magnet

Relatively low cost ; poor resistance to corrosion and should have a coating ; Very high strength; can replace SmCo magnets

Sintered neodymium-iron-boron (Nd-Fe-B) magnets are the most powerful commercialized permanent magnets available today, with maximum energy product ranging from 35 MGOe to 52 MGOe. Nd-Fe-B is the third generation of permanent magnet developed in the 1980s. It has a combination of very high remanence and coercivity, and comes with a wide range of grades, sizes and shapes. With its excellent magnetic characteristics, abundant raw material and relatively low prices, Nd-Fe-B offers more flexibility in designing of new or replace the traditional magnet materials such as ceramic, Alnico and Sm-Co to achieve high efficiency, low cost and more compact devices.

Magnetic characteristics of sintered NdFeb
	(Br)		(bHc)		(iHc)		(BH)max
GRADE									Tw °C
	T	KGs	KA/m	KOe	KA/m	KOe	KJ/m3	MGOe
N35M	1.18-1.23	11.8-12.3	≥868	≥10.9	≥1114	≥14	263-287	33-36	≤100
N38M	1.22-1.28	12.2-12.8	≥899	≥11.3	≥1114	≥14	287-310	36-39	≤100
N40M	1.26-1.31	12.6-13.1	≥923	≥11.6	≥1114	≥14	302-326	38-41	≤100
N42M	1.28-1.34	12.8-13.4	≥923	≥11.6	≥1114	≥14	318-342	40-43	≤100
N45M	1.34-1.39	13.4-13.9	≥876	≥11.0	≥1114	≥14	342-366	43-46	≤100
N48M	1.36-1.42	13.6-14.2	≥876	≥11.0	≥1114	≥14	366-390	46-49	≤100
N35H	1.18-1.23	11.8-12.3	≥868	≥10.9	≥1353	≥17	263-287	33-36	≤120
N38H	1.22-1.28	12.2-12.8	≥899	≥11.3	≥1353	≥17	287-310	36-39	≤120
N40H	1.26-1.31	12.6-13.1	≥923	≥11.6	≥1353	≥17	302-326	38-41	≤120
N42H	1.28-1.34	12.8-13.4	≥923	≥11.6	≥1353	≥17	318-342	40-43	≤120
N45H	1.33-1.39	13.3-13.9	≥923	≥11.6	≥1353	≥17	342-366	43-46	≤120
N48H	1.36-1.42	13.6-14.2	≥923	≥11.6	≥1274	≥16	366-390	46-49	≤120
N33SH	1.14-1.19	11.4-11.9	≥836	≥10.5	≥1592	≥20	247-270	31-34	≤150
N35SH	1.18-1.23	11.8-12.3	≥868	≥10.9	≥1592	≥20	263-287	33-36	≤150
N38SH	1.22-1.28	12.2-12.8	≥899	≥11.3	≥1592	≥20	287-310	36-39	≤150
N40SH	1.26-1.31	12.6-13.1	≥923	≥11.6	≥1592	≥20	302-326	38-41	≤150
N42SH	1.28-1.34	12.8-13.4	≥923	≥11.6	≥1592	≥20	318-342	40-43	≤150
N45SH	1.33-1.39	13.3-13.9	≥923	≥11.6	≥1592	≥20	342-366	43-46	≤150

Neodymium magnets are the most powerful commercially produced magnets. NdFeB magnets have a higher Maximum Energy Product, (BH).max, which can easily reach 30 MGOe and even goes up to 50 MGOe. NdFeB magnets can replace SmCo magnets in most cases, especially where operating temperature is less than 80 degrees Centigrade. Very high strength. Relatively low cost. Compared to Alnico and SmCo magnets, relatively easy to machine.

Quick Leads

Manufacturing process - sintering (most common), injection molding, and compression bonding. Shapes available - blocks, bars, discs, rings, cylinders, arc segments, or irregular shapes, etc. Wide range of Grades available- from about 3330 to 5311. (First 2 digits represent BH.max, and second two digits represent Intrinsic Coercivity, Hci.) Density: 7.4 -7.6 g/ cm3; Hardness: 600 {Hv} Some particular grades  can achieve 200°c the max working temperature. Saturation magnetizing field required - about 35kOe Machining - Neodymium magnets should be machined by grinding using diamond wheels, however, of the hard magnet materials, Neo magnets are the least difficult to machine. We can successfully machine very small magnets.

NdFeB Magnet