Sintered NdFeB magnets

• General Descriptions
• Pictures of Sintered NdFeB Magnets
• Standard Shapes of NdFeB Magnets
• Magnetization Direction
• Demagnetization curves of sintered NdFeB magnets
• Workshop View
• Surface Treatment
• Flow Chart of Sintered NdFeB magnets

General Descriptions of sintered NdFeB magnets

The most powerful magnets available, Sintered NdFeB is produced by powder metallurgical process with chemical composition of Nd2Fe14B, which are hard, brittle and easily corrode, involving the sintering of compacts under vacuum. Poorest corrosion resistance of all commercial magnetic material. Grinding and slicing possible; very reactive with moisture and oxygen; coating may be applied depending on the expected environment. The sintered NdFeB magnet has high remanence, high coercive force, high-energy product and high ratio between performance value and product cost. It may be easily formed into various sizes. The intrinsic coercive force is over 30,000 Oe. Neodymium magnets lose -0.09 ~ -0.13% of Br/°C. Their working stability is under 80°C for low Hci. Neodymium magnets and above 200°C for high Hci Neodymium magnets. The highest (BH)max reaches up to 51MGOe . The choice of Strip casting and HDDR technology in our factory allows us to make high performance NdFeB over N52 possible. Surface treatments have been developed that allow the sintered NdFeB magnet to be used in most applications. The treatments include gold, nickel, zinc and tin plating and epoxy resin coating.

Magnetic Properties of Sintered NdFeB Magnets

Item	Grade	Remanence;Br				Coercive Force;bHc		Intrinsic Coercive;iHc		Maximim Energy Prodouct;(BH)max				Working Temp.℃
		kGs		T		kOe	KA/m	kOe	KA/m	MGOe		KJ/m3
		Max.	Min.	Max.	Min.					Max.	Min.	Max.	Min.
N	N54	15.1	14.5	1.51	1.45	≥10.5	≥ 836	≥11	≥ 876	55	51	438	406	≤80
	N52	14.8	14.2	1.48	1.42	≥10.5	≥ 836	≥11	≥ 876	53	49	422	390	≤80
	N50	14.5	14	1.45	1.4	≥11.0	≥ 876	≥12	≥ 955	51	47	406	374	≤80
	N48	14.3	13.7	1.43	1.37	≥11.0	≥ 876	≥12	≥ 955	49	45	390	358	≤80
	N45	13.8	13.2	1.38	1.32	≥11.0	≥ 876	≥12	≥ 955	46	42	366	334	≤80
	N42	13.5	12.9	1.35	1.29	≥11.0	≥ 876	≥12	≥ 955	44	40	350	318	≤80
	N40	13.2	12.6	1.32	1.26	≥11.0	≥ 876	≥12	≥ 955	42	38	334	302	≤80
	N38	13	12.2	1.3	1.22	≥11.0	≥ 876	≥12	≥ 955	40	36	318	287	≤80
M	N52M	14.8	14.2	1.48	1.42	≥13.3	≥1059	≥14	≥1114	53	49	422	390	≤100
	N50M	14.5	14	1.45	1.4	≥13.1	≥1043	≥14	≥1114	51	47	406	374	≤100
	N48M	14.3	13.7	1.43	1.37	≥12.8	≥1019	≥14	≥1114	49	45	390	358	≤100
	N45M	13.8	13.2	1.38	1.32	≥12.4	≥ 987	≥14	≥1114	46	42	366	334	≤100
	N42M	13.5	12.9	1.35	1.29	≥12.1	≥ 963	≥14	≥1114	44	40	350	318	≤100
	N40M	13.2	12.6	1.32	1.26	≥11.8	≥ 939	≥14	≥1114	42	38	334	302	≤100
	N38M	13	12.2	1.3	1.22	≥11.5	≥ 915	≥14	≥1114	40	36	318	287	≤100
H	N50H	14.5	14	1.45	1.4	≥12.9	≥1027	≥16	≥1274	51	47	406	374	≤120
	N48H	14.3	13.7	1.43	1.37	≥12.7	≥1011	≥16	≥1274	49	45	390	358	≤120
	N46H	14	13.4	1.4	1.34	≥12.5	≥ 995	≥17	≥1353	47	43	374	342	≤120
	N44H	13.7	13.1	1.37	1.31	≥12.3	≥ 979	≥17	≥1353	45	41	358	326	≤120
	N42H	13.5	12.9	1.35	1.29	≥12.1	≥ 963	≥17	≥1353	44	40	350	318	≤120
	N40H	13.2	12.6	1.32	1.26	≥11.8	≥ 939	≥17	≥1353	42	38	334	302	≤120
	N38H	13	12.2	1.3	1.22	≥11.5	≥ 915	≥17	≥1353	40	36	318	287	≤120
	N35H	12.4	11.7	1.24	1.17	≥11.0	≥ 876	≥17	≥1353	37	33	295	263	≤120
SH	N46SH	14	13.4	1.4	1.34	≥11.0	≥ 995	≥20	≥1592	47	43	374	342	≤150
	N44SH	13.7	13.1	1.37	1.31	≥12.5	≥ 979	≥20	≥1592	45	41	358	326	≤150
	N42SH	13.5	12.9	1.35	1.29	≥12.3	≥ 963	≥20	≥1592	44	40	350	318	≤150
	N40SH	13.2	12.6	1.32	1.26	≥12.1	≥ 939	≥20	≥1592	42	38	334	302	≤150
	N38SH	12.9	12.2	1.29	1.22	≥11.8	≥ 915	≥20	≥1592	40	36	318	287	≤150
	N35SH	12.4	11.7	1.24	1.17	≥11.5	≥ 876	≥20	≥1592	37	33	295	263	≤150
	N33SH	12.1	11.4	1.21	1.14	≥11.0	≥ 852	≥20	≥1592	35	31	279	247	≤150
UH	N42UH	13.5	12.9	1.35	1.29	≥12.1	≥ 963	≥25	≥1990	44	40	350	318	≤180
	N40UH	13.2	12.6	1.32	1.26	≥11.8	≥ 939	≥25	≥1990	42	38	334	302	≤180
	N38UH	12.9	12.2	1.29	1.22	≥11.5	≥ 915	≥25	≥1990	40	36	318	287	≤180
	N35UH	12.4	11.7	1.24	1.17	≥11.0	≥ 876	≥25	≥1990	37	33	295	263	≤180
	N33UH	12.1	11.4	1.21	1.14	≥10.7	≥ 852	≥25	≥1990	35	31	279	247	≤180
	N30UH	11.6	10.8	1.16	1.08	≥10.2	≥ 812	≥25	≥1990	32	28	255	223	≤180
EH	N38EH	12.9	12.2	1.29	1.22	≥11.5	≥ 915	≥30	≥2388	40	36	318	287	≤200
	N35EH	12.4	11.7	1.24	1.17	≥11.0	≥ 876	≥30	≥2388	37	33	295	263	≤200
	N33EH	12.1	11.4	1.21	1.14	≥10.7	≥ 851	≥30	≥2388	35	31	279	247	≤200
	N30EH	11.5	10.8	1.15	1.08	≥10.2	≥ 812	≥30	≥2388	32	28	255	223	≤200
AH	N33AH	12.1	11.4	1.21	1.14	≥10.7	≥ 852	≥35	≥2786	35	31	279	247	≤230
	N30AH	11.5	10.8	1.15	1.08	≥10.2	≥ 812	≥35	≥2786	32	28	255	223	≤230
	N28AH	11.2	10.4	1.12	1.04	≥9.70	≥ 772	≥35	≥2786	30	26	239	207	≤230

 

Physical Characteristics of Sintered NdFeB Magnets

Characteristics	Unit	Specification
Curie Temp.	oC	310~340
Reversible Temp. Coefficient of Br 20~100	%/ oC	-0.100 ~ -0.126
Reversible Temp. Coefficient of Hcj 20~100	%/ oC	-0.50 ~ -0.65
Density	g/cm3	≥7.3
Vickers Hardness		600
Bending Strength	MPa	250
Tensile Strength	MPa	80
Compressive Strength	MPa	1050
Specific Resistance	μΩcm	150
Thermal Conductivity	W/(m. oC)	9
Thermal Expansion	10-6	5 (Parallel w. orientation direction)
		-1.5 (vertical w. orientation direction)
Specific Heat	J/(kg. oC)	460

Features of Sintered NdFeB Magnet:

1. Moderate temperature stability; Extremely resistance to demagnetization.
2. Excellent strength value.
3. Advanced Technology.
4. Effective surface treatment to prevent corrosion.
5. High resistance to demagnetization; Excellent cost to performance ratio; Reasonable temperature stability; Not suitable for application which exposed in high temperature conditions.

Application of Sintered NdFeB:

Especially suitable for used in various electronic motors, engineering equipment, medical equipment, Health bandages and plasters, audio apparatus, Micro products of Auto, National defence, Security systems, Computer, Biology project, Instrument and Meter, household appliances, Magnetic separators, Magnetic resonance imaging, Specialty door catches, Filters & strainers, Sensors Speakers, Microphone/earphone, High performance motors, Brushless motor, Micromotor / servo motor, VCM(voice coil motor) Automobiles, Magnetic coupling Magnetic Chuck, Magnetic toy, Magnetic tools, Other magnetic applications.