NdFeB magnet

Neodymium(Nd)-Iron(Fe)-Boron(B) is the third generation of Rare Earth Magnet, it is the most powerful magnet in the world at present, its maximum energy product is up to 48 MGOe. Due to its excellent performance and reasonable price, it has been developed rapidly and widely applied to motor, permanent magnet meter, electronic industry, automobile industry, oil industry, acoustics equipment, magnetic suspension system and so on.

Sintered NdFeB is very easy to be rusted and oxidated in the air, so the surface treatments is necessary in order to hold close mechanical tolerances , such as: Zine coating, Nickel coating, Gold coating, electrophoretic coating, epoxy resin coating, passivation (temporary surface) etc.

Physical properties of Sintered NdFeB

Item	Unit	Value
Temperature Coefficient of Br	%/°C	-0.11
Density	G/cm3	7.3-7.6
Vickers Hardness	Hv	600
Tensile Strength	kg/mm2	8.0
Specific Heat	Cak(kg°C)	0.12k
Young's Modulus	N/m2	1.6x1011
Poisson's Ratio		0.24
Curie Temperature	°C	310-340
Electrical Resistivity	Ω.cm	144

Typical Magnetic properties of sintered NdFeB

Grade
		Remanence Br				Coercive force HcB				Intrinsic coercive force HcJ		Maximum energy product (BH)max				Tw
		kGs		T		kOe		kA/m		kOe	kA/m	MGOe		KJ/m3		℃
		Nom.	Min.	Nom.	Min.	Nom.	Min.	Nom.	Min.			Nom.	Min.	Nom.	Min.
1	N30	11.2	10.8	1.12	1.08	10.5	9.8	836	780	≥12	≥955	30	28	239	223	≤80
2	N33	11.7	11.4	1.17	1.14	11.0	10.3	876	820	≥12	≥955	33	31	263	247	≤80
3	N35	12.1	11.7	1.21	1.17	11.5	10.8	915	860	≥12	≥955	35	33	279	263	≤80
4	N38	12.6	12.2	1.26	1.22	11.5	10.8	915	860	≥12	≥955	38	36	303	287	≤80
5	N40	12.9	12.6	1.29	1.26	11.0	10.5	876	836	≥12	≥955	40	38	318	303	≤80
6	N43	13.3	13.0	1.33	1.30	11.0	10.5	876	836	≥12	≥955	43	41	342	326	≤80
7	N45	13.7	13.3	1.37	1.33	11.0	10.5	876	836	≥12	≥955	45	43	358	342	≤80
8	N48	14.0	13.7	1.40	1.37	11.0	10.5	876	836	≥12	≥955	48	45	374	358	≤80
9	N50	14.6	14.0	1.46	1.40	11.0	10.5	876	836	≥12	≥955	51	47	390	358	≤80
10	N30M	11.2	10.8	1.12	1.08	10.5	9.8	836	780	≥14	≥1114	30	28	239	223	≤100
11	N33M	11.7	11.4	1.17	1.14	11.0	10.3	876	820	≥14	≥1114	33	31	263	247	≤100
12	N35M	12.1	11.7	1.21	1.17	11.5	10.8	915	860	≥14	≥1114	35	33	279	263	≤100
13	N38M	12.6	12.2	1.26	1.22	11.5	10.8	915	860	≥14	≥1114	38	36	303	287	≤100
14	N40M	12.9	12.6	1.29	1.26	11.5	10.8	915	860	≥14	≥1114	40	38	318	303	≤100
15	N42M	13.2	12.9	1.32	1.29	11.5	10.8	915	860	≥14	≥1114	42	40	342	326	≤100
16	N45M	13.7	13.2	1.37	1.32	11.5	10.8	915	860	≥14	≥1114	45	42	358	342	≤100
17	N48M	14.3	13.7	1.43	1.37	11.5	10.8	915	860	≥14	≥1114	49	45	390	358	≤100
18	N27H	10.6	10.2	1.06	1.02	10.0	9.3	796	740	≥17	≥1353	27	25	315	199	≤120
19	N30H	11.2	10.8	1.12	1.08	10.5	9.8	836	780	≥17	≥1353	30	28	239	223	≤120
20	N33H	11.7	11.4	1.17	1.14	11.0	10.3	876	820	≥17	≥1353	33	31	263	247	≤120
21	N35H	12.1	11.7	1.21	1.17	11.5	10.8	915	860	≥17	≥1353	35	33	279	263	≤120
22	N38H	12.6	12.2	1.26	1.22	12.0	11.5	955	915	≥17	≥1353	38	36	303	287	≤120
23	N40H	12.9	12.6	1.29	1.26	12.0	11.5	955	915	≥17	≥1353	40	38	318	303	≤120
24	N42H	13.2	12.9	1.32	1.29	12.0	11.5	955	915	≥17	≥1353	42	40	342	326	≤120
25	N44H	13.6	13.2	1.36	1.32	12.0	11.5	955	915	≥17	≥1353	44	42	358	342	≤120
26	N27SH	10.6	10.2	1.06	1.02	10.0	9.3	796	740	≥20	≥1595	27	25	315	199	≤150
27	N30SH	11.2	10.8	1.12	1.08	10.5	9.8	836	780	≥20	≥1595	30	28	239	223	≤150
28	N33SH	11.7	11.4	1.17	1.14	11.0	10.3	876	820	≥20	≥1595	33	31	263	247	≤150
29	N35SH	12.1	11.7	1.21	1.17	11.5	10.8	915	860	≥20	≥1595	35	33	279	263	≤150
30	N38SH	12.6	12.2	1.26	1.22	12.0	11.7	955	930	≥20	≥1595	38	36	302	286	≤150
31	N40SH	12.9	12.6	1.29	1.26	12.0	11.7	1011	955	≥20	≥1595	40	38	318	303	≤150
32	N42SH	13.2	12.9	1.32	1.29	12.0	11.7	1011	955	≥20	≥1595	42	40	342	326	≤150
33	N25UH	10.2	9.8	1.02	0.98	9.6	9.2	764	732	≥25	≥1990	25	23	199	183	≤180
34	N28UH	10.8	10.4	1.08	1.04	10.2	9.8	812	780	≥25	≥1990	28	26	223	207	≤180
35	N30UH	11.2	10.8	1.12	1.08	10.6	10.1	844	804	≥25	≥1990	30	28	239	223	≤180
36	N33UH	11.7	11.4	1.17	1.14	11.0	10.4	876	844	≥25	≥1990	33	30	263	247	≤180
37	N35UH	12.1	11.7	1.21	1.17	11.5	10.8	915	860	≥25	≥1990	35	33	279	263	≤180
38	N38UH	12.6	12.2	1.26	1.22	12.0	11.7	955	930	≥25	≥1990	38	33	302	280	≤180
39	N30EH	11.2	10.8	1.12	1.08	10.6	10.1	844	804	≥30	≥2229	30	28	239	223	≤200
40	N33EH	11.7	11.4	1.17	1.14	11.0	10.4	876	844	≥30	≥2229	33	30	263	247	≤200
41	N35EH	12.1	11.7	1.21	1.17	11.5	10.8	915	860	≥30	≥2229	35	33	279	263	≤200

Remark: The above mentioned data is tested at the room temperature. The maximum working temperature will vary with L/D (Length and Diameter ratio), coation and environmental facts.

The Demagnetization Curve of Sintered NdFeB

Bonded NdFeB magnets made by Rapidly Quenched NdFeB magnetic powders have better mechanical properties and higher precision. These magnets are easier to use and are good candidates for the magnetic parts with complex shapes used in many applications, such as computers, instruments, automobiles and medical devices.

Bonded NdFeB magnets also have the following advantages:

The bond NdFeB magnets can be produced with close tolerances off tool, with little or no finishing required.

High magnetic output is coupled with excellent physical strength.

Molded magnets are more chip resistant than other types making handling easier on production assembly lines.

The binders and magnetic alloys utilized are capable of a wide range of application temperatures from below -40°C to above 180°C.

Typical Magnetic and physical properties of Bonded NdFeB

Grade	Br		Hcb		Hcj		(BH)max		α(Br)	Tc	Tw	Density
Grade	mT	kGs	KA/m	kOe	KA/m	kOe	KJ/m3	MGOe	%/ ℃	℃	℃	g/cm3
SBN-4	400-490	4.0-4.9	256-336	3.2-4.2	640-800	8-10	24-40	3-5	-0.13	360	120	5.5—6.5
SBN-5	420-540	4.2-5.4	275-368	3.4-4.6	640-800	8-10	32-48	4-6	-0.13	360	120
SBN-7	520-620	5.2-6.2	336-416	4.2-5.2	640-800	8-10	48-64	6-8	-0.13	360	120
SBN-9	620-700	6.2-7.0	400-456	5.0-5.7	640-800	8-10	64-80	8-10	-0.13	360	120
SBN-10	670-740	6.7-7.4	424-472	5.3-5.9	520-640	6.5-8.0	72-88	9-11	-0.13	360	120
SBN-11	680-750	6.8-7.5	472-512	5.9-6.4	720-840	9-10.5	80-96	10-12	-0.13	360	120
SBN-5H	420-520	4.2-5.2	280-376	3.5-4.7	1120-1360	14-17	32-48	4-6	-0.13	360	120
SBN-7H	520-600	5.2-6.0	368-432	4.6-5.4	1120-1360	14-17	48-64	6-8	-0.13	360	120
SBN-9H	600-660	6.0-6.6	432-488	5.4-6.1	1120-1360	14-17	64-80	8-10	-0.13	360	120

Remark: What we list herein are only typical grades of Bonded NdFeB magnets. We also could manufacture various magnetic properties according to the customer's requirements.

Contact person: Sean Liu

Add: Unit 801, #871-3, Xiahe Road, Xiamen City, 361004, China

Tel: 0086-592-5802700

Fax: 0086-592-5170127

E-mail: jingxin@jingxin-magnet.com

http://www.jingxin-magnet.com

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