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Introduction And Table Properties Of NdFeB Magnets

Abstract： The third generation rare earth permanent magnet NdFeB permanent magnet is the strongest performance in contemporary magnet. Its BHmax value is 5-12 times of ferrite magnet, alnico magnet is 3-10 times; 5-10 times its coercivity is equivalent to the ferrite magnet, alnico magnet 5-15 times, its potential magnetic properties is extremely high, can ...

The third generation rare earth permanent magnet NdFeB permanent magnet is the strongest performance in contemporary magnet. Its BHmax value is 5-12 times of ferrite magnet, alnico magnet is 3-10 times; 5-10 times its coercivity is equivalent to the ferrite magnet, alnico magnet 5-15 times, its potential magnetic properties is extremely high, can absorb the equivalent of 640 times its own weight. Because iron main raw materials NdFeB magnets are very cheap, reserves of rare earth neodymium samarium more than 10-16 times, so the price is low many SmCo magnets. Mechanical properties of NdFeB magnets are better than SmCo magnet, alnico magnet, easy cutting and drilling and processing of complex shape. Deficiency of NdFeB magnet is its poor performance in high temperature, the use of magnetic loss is larger, the maximum working temperature is low. In general about 80 degrees Celsius, after special treatment of magnet, its highest working temperature can reach 200 degrees celsius. Because the material containing neodymium and iron in large amounts, so easy to rust is also one of its major weakness. So the NdFeB magnets must be surface coating. Can be electroplated nickel ( Ni ), zinc ( Zn ), gold ( Au ), chromium ( Cr ), epoxy resin ( Epoxy ). NdFeB magnets are widely used in aerospace, electronics, electrical, instrumentation, medical and other fields. But technology has become more and more widely used, such as adsorption magnet, toys, jewelry and so on. Production process: ----> ----> ingredients; melting; milling ----> ----> molding; sintering ----> ----> test; mechanical processing ----> ----> plating; magnetization ----> ----> packagingTable Of Standard Performance：

No.	Grade	Remanence Br				Coercive force bHc				Intrinsic coercive force iHc		Maximum energy product (BH)max				Working temp
		KG		T		KOe		KA/m		KOe	KA/m	MGOe		KJ/m3		°C
		Nom.	Min.	Nom.	Min.	Nom.	Min.	Nom.	Min.	KOe	KA/m	Nom.	Min.	Nom.	Min.	°C
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	N42	13.2	12.6	1.32	1.26	11.0	10.5	876	836	>= 12	>= 955	42	40	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	14.1	13.7	1.41	1.37	11.0	10.5	876	836	>= 12	>= 955	48	46	383	367	<= 80
9	N30M	11.2	10.8	1.12	1.08	10.5	9.8	836	780	>= 14	>= 1114	30	28	239	223	<= 100
10	N33M	11.7	11.4	1.17	1.14	11.0	10.3	876	820	>= 14	>= 1114	33	31	263	247	<= 100
11	N35M	12.1	11.7	1.21	1.17	11.5	10.8	915	860	>= 14	>= 1114	35	33	279	263	<= 100
12	N38M	12.6	12.2	1.26	1.22	11.5	10.8	915	860	>= 14	>= 1114	38	36	303	257	<= 100
13	N40M	12.9	12.6	1.29	1.26	11.5	10.8	915	860	>= 14	>= 1114	40	38	318	303	<= 100
14	N42M	13.2	12.9	1.32	1.29	11.0	10.5	876	836	>= 14	>= 1114	42	40	342	326	<= 100
15	N45M	13.7	13.3	1.37	1.33	11.0	10.5	976	836	>= 14	>= 1114	45	43	358	342	<= 100
16	N48M	14.1	13.7	1.41	1.37	11.0	10.5	876	836	>= 14	>= 1114	48	46	383	367	<= 100
17	N30H	11.2	10.8	1.12	1.08	10.5	9.8	836	780	>= 17	>= 1353	30	28	239	223	<= 120
18	N33H	11.7	11.4	1.17	1.14	11.0	10.3	876	820	>= 17	>= 1353	33	31	263	247	<= 120
19	N35H	12.1	11.7	1.21	1.17	11.5	10.8	915	860	>= 17	>= 1353	35	33	279	263	<= 120
20	N40H	12.9	12.6	1.29	1.26	12.0	11.5	955	915	>= 17	>= 1353	40	38	318	303	<= 120
21	N42H	13.2	12.9	1.32	1.29	11.0	10.5	876	836	>= 17	>= 1353	42	40	342	326	<= 120
22	N45H	13.7	13.3	1.37	1.33	11.0	10.5	876	836	>= 17	>= 1353	45	43	358	342	<= 120
23	N34AH	11.6	11.0	1.16	1.10	11.3	10.5	900	836	>= 32	>= 2547	34	31	271	247	<= 240
24	N30SH	11.2	10.8	1.12	1.08	10.5	9.8	836	780	>= 20	>= 1595	30	28	239	223	<= 150
25	N33SH	11.7	11.4	1.17	1.14	11.0	10.3	876	820	>= 20	>= 1595	33	31	263	247	<= 150
26	N35SH	12.1	11.7	1.21	1.17	11.5	10.8	915	860	>= 20	>= 1595	35	33	279	263	<= 150
27	N38SH	12.6	12.2	1.26	1.22	12.3	11.8	979	939	>= 20	>= 1595	38	36	303	287	<= 150
28	N40SH	12.9	12.6	1.29	1.26	12.6	12.0	1003	955	>= 20	>= 1595	40	38	318	303	<= 150
29	N42SH	13.2	12.9	1.32	1.29	11.0	10.5	876	836	>= 20	>= 1595	42	40	342	326	<= 150
30	N28UH	10.8	10.4	1.08	1.04	10.2	9.8	812	780	>= 25	>= 1990	28	26	223	207	<= 180
31	N30UH	11.2	10.8	1.12	1.08	10.6	10.1	844	804	>= 25	>= 1990	30	28	239	223	<= 180
32	N33UH	11.7	11.4	1.17	1.14	11.0	10.3	875	820	>= 25	>= 1990	33	31	263	247	<= 180
33	N35UH	12.1	11.7	1.21	1.17	11.5	10.8	915	860	>= 25	>= 1990	35	33	279	263	<= 180
34	N38UH	12.6	12.2	1.26	1.22	12.0	11.4	955	908	>= 25	>= 1990	38	35	303	279	<= 180
35	N40UH	12.9	12.6	1.29	1.26	12.4	11.8	987	940	>= 25	>= 1990	40	38	319	303	<= 180
36	N26EH	10.4	10.0	1.04	1.00	10.2	9.6	812	764	>= 30	>= 2388	26	24	207	191	<= 200
37	N28EH	10.8	10.4	1.08	1.04	10.4	9.8	811	780	>= 30	>= 2388	28	26	223	207	<= 200
38	N30EH	12.2	10.8	1.12	1.08	10.6	10.1	844	804	>= 30	>= 2388	30	28	239	223	<= 200
39	N33EH	11.6	11.2	1.16	1.12	11.0	10.4	876	828	>= 30	>= 2388	33	30	263	239	<= 200
40	N35EH	12.1	11.7	1.21	1.17	11.5	10.8	915	860	>= 30	>= 2388	36	33	287	263	<= 200

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