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Sintered NdFeB Rare Earth Permanent Magnet Overview

Sintered NdFeB Rare Earth Magnet is a kind of functional material that is necessary for basic industry and frontier science. In order to keep up with the rapid developing trend of NdFeb rare earth magnets production and application in the world, the factory backed by its year's professional experience and convenient well-situated facility, continuously promotes the development and production in the field.

NdFeB magnet is mainly made of Neodymium Iron and Boron,with excellent magnetic property abundant raw material and reasonable prices, NdFeB Magnet can be used as an ideal magnet in mini-motor Permanent magnetic resonance sound device magnetic suspension system,magnetic transmission machine and iatrical apparatus and etc.For NdFeB,its surface is usually treatd with some special methods.The surface treatment method include Zine Nickel Tin Silver Gold plating Phosphor and Spray Epoxy Resin etc.

Wide Applications
With its excellent magnetic property, abundant raw material and reasonable prices, rare-earth permanent magnet can be used as an ideal magnet in mini-motor, permanent-magnet instrument,electronic industry, auto industry, petro-chemical industry,nuclear magnetic resonance,sound device, magnetic suspension system, magnetic transmission machine and magnetotherapy apparatus etc.

NdFeB magnets Chemical composition:

Chemical analysis for sintering NdFeB magnets material based on intermetallic compounds RE2Fe14B,main composition is NdFeB magnet is (RE), (Fe) (B),thereinto thulium (Nd), in order to obtain different performance can instead by thulium of (Dy),(Pr) etc. also other metal can instead Fe,for example (Co), (Al) etc., smaller content of boron, but it affect tetragonal crystal intermetallics, making the intermetallics with high magnetization,uniaxial anisotropy and curie temperature.
NdFeB magnets Making process:
NdFeB magnet use Powder Metallurgy Process, proportion of material such as: neodymium, dysprosium, iron, cobalt, niobium, praseodymium, aluminum, iron, and boron etc., through Mid-frequency Induction Furnace smelting to alloy steel ingot, then broken into power of 3~5um,and forming mold in magnetic field, the green bodies sintering dense and tempering in Vacuum Sintering Furnace, that can earn magnetic properties of blank of permanent magnet. After grinding, drilling, cutting and other processing, last via surface finish, it is good NdFeB magnet.

Magnetic Properties of Sintered NdFeB Magnet

Grade	Remanence		Coercivity Force		Intrinsic Coercive Force		Max. Energy Product		maximum Operating Temp.
	Br		Hcb		Hcj		£¨ BH £© max
	mT	kGs	kA/m	kOe	kA/m	kOe	kJ/m3	MGOe
N27	1030-1080	10.3-10.8	≥796	≥10.0	≥955	≥12	199-231	25-29	80 °C
N30	1080-1130	10.8-11.3	≥796	≥10.0	≥955	≥12	223-247	28-31	80 °C
N33	1130-1170	11.3-11.7	≥836	≥10.5	≥955	≥12	247-271	31-34	80 °C
N35	1170-1220	11.7-12.2	≥868	≥10.9	≥955	≥12	263-287	33-36	80 °C
N38	1220-1250	12.2-12.5	≥899	≥11.3	≥955	≥12	287-310	36-39	80 °C
N40	1250-1280	12.5-12.8	≥907	≥11.4	≥955	≥12	302-326	38-41	80 °C
N42	1280-1320	12.8-13.2	≥915	≥11.5	≥955	≥12	318-342	40-43	80 °C
N45	1320-1380	13.2-13.8	≥923	≥11.6	≥955	≥12	342-366	43-46	80 °C
N48	1380-1420	13.8-14.2	≥923	≥11.6	≥876	≥12	366-390	46-49	80 °C
N50	1400-1450	14.0-14.5	≥796	≥10.0	≥876	≥11	382-406	48-51	60 °C
N52	1430-1480	14.3-14.8	≥796	≥10.0	≥876	≥11	398-422	50-53	60 °C
30M	1080-1130	10.8-11.3	≥796	≥10.0	≥1114	≥14	223-247	28-31	100 °C
33M	1130-1170	11.3-11.7	≥836	≥10.5	≥1114	≥14	247-263	31-33	100 °C
35M	1170-1220	11.7-12.2	≥868	≥10.9	≥1114	≥14	263-287	33-36	100 °C
38M	1220-1250	12.2-12.5	≥899	≥11.3	≥1114	≥14	287-310	36-39	100 °C
40M	1250-1280	12.5-12.8	≥923	≥11.6	≥1114	≥14	302-326	38-41	100 °C
42M	1280-1320	12.8-13.2	≥955	≥12.0	≥1114	≥14	318-342	40-43	100 °C
45M	1320-1380	13.2-13.8	≥995	≥12.5	≥1114	≥14	342-366	43-46	100 °C
48M	1360-1430	13.6-14.3	≥1027	≥12.9	≥1114	≥14	366-390	46-49	100 °C
50M	1400-1450	14.0-14.5	≥1033	≥13.0	≥1114	≥14	382-406	48-51	100 °C
30H	1080-1130	10.8-11.3	≥796	≥10.0	≥1353	≥17	223-247	28-31	120 °C
33H	1130-1170	11.3-11.7	≥836	≥10.5	≥1353	≥17	247-271	31-34	120 °C
35H	1170-1220	11.7-12.2	≥868	≥10.9	≥1353	≥17	263-287	33-36	120 °C
38H	1220-1250	12.2-12.5	≥899	≥11.3	≥1353	≥17	287-310	36-39	120 °C
40H	1250-1280	12.5-12.8	≥923	≥11.6	≥1353	≥17	302-326	38-41	120 °C
42H	1280-1320	12.8-13.2	≥955	≥12.0	≥1353	≥17	318-342	40-43	120 °C
45H	1300-1360	13-13.6	≥963	≥12.1	≥1353	≥17	326-358	43-46	120 °C
48H	1370-1430	13.7-14.3	≥995	≥12.5	≥1353	≥17	366-390	46-49	120 °C
30SH	1080-1130	10.8-11.3	≥804	≥10.1	≥1592	≥20	223-247	28-31	150 °C
33SH	1130-1170	11.3-11.7	≥844	≥10.6	≥1592	≥20	247-271	31-34	150 °C
35SH	1170-1220	11.7-12.2	≥876	≥11.0	≥1592	≥20	263-287	33-36	150 °C
38SH	1220-1250	12.2-12.5	≥907	≥11.4	≥1592	≥20	287-310	36-39	150 °C
40SH	1240-1280	12.5-12.8	≥939	≥11.8	≥1592	≥20	302-326	38-41	150 °C
42SH	1280-1320	12.8-13.2	≥987	≥12.4	≥1592	≥20	318-342	40-43	150 °C
45SH	1320-1380	13.2-13.8	≥1003	≥12.6	≥1592	≥20	342-366	43-46	150 °C
28UH	1020-1080	10.2-10.8	≥764	≥9.6	≥1990	≥25	207-231	26-29	180 °C
30UH	1080-1130	10.8-11.3	≥812	≥10.2	≥1990	≥25	223-247	28-31	180 °C
33UH	1130-1170	11.3-11.7	≥852	≥10.7	≥1990	≥25	247-271	31-34	180 °C
35UH	1180-1220	11.8-12.2	≥860	≥10.8	≥1990	≥25	263-287	33-36	180 °C
38UH	1220-1250	12.2-12.5	≥876	≥11.0	≥1990	≥25	287-310	36-39	180 °C
40UH	1240-1280	12.5-12.8	≥899	≥11.3	≥1990	≥25	302-326	38-41	180 °C
28EH	1040-1090	10.4-10.9	≥780	≥9.8	≥2388	≥30	207-231	26-29	200 °C
30EH	1080-1130	10.8-11.3	≥812	≥10.2	≥2388	≥30	223-247	28-31	200 °C
33EH	1130-1170	11.3-11.7	≥836	≥10.5	≥2388	≥30	247-271	31-34	200 °C
35EH	1170-1220	11.7-12.2	≥876	≥11.0	≥2388	≥30	263-287	33-36	200 °C
38EH	1220-1250	12.2-12.5	≥899	≥11.3	≥2388	≥30	287-310	36-39	200 °C

1. 以上磁性能参数均为室温下的数据；

The above-mentioned data of magnetic parameters are given at room temperature.

2. 以上牌号为基本牌号，在基本牌号基础上衍生 T 系列（如 35SHT 等）和 L-T 系列牌号（如 L-38SHT 等），其主要磁性能同对应的基本牌号的主要磁性能。

The above-mentioned grades are our basic grade. We also have T (for instance 35SHT, etc.) and L-T (for instance L-38SHT, etc.) series grades which are derived from these basic grades. The main properties of the derived grades are corresponding to those of the basic grades.

3. 最高工作温度定义是将规定尺寸（稀土永磁为φ 10 × 7 ）的样品加热到某一恒定的温度，长时间放置（一般取 1000h ），然后将样品冷却到室温，其开路磁通不可逆损失小于 5% 的最高保温温度定义为该永磁材料的最高工作温度，符号为 Tw ，单位为 K 或℃。

最高工作温度一般依赖于牌号，工作点（ Pc 值），镀层和环境等因数。

The max working temperature,which the sampling specification(Permanent Magnet:φ10×7) to heat up to the regular temperature for lay of long time(general 1000H.). Then take this sampling to cooling attained room temperature.The irreversible loss of magnetic flux is less than 5%,This max keep temperature definiteness which is the permanent material should be acception by the max temperature. The sign:Tw,The unit:K or ℃

The maximum working temperature of magnet is changeable due to grade, operating point, coating and environmental factors.

Physical Properties of Sintered NdFeB Magnet

Temp.Coeff.of Br	-0.11%/ °C	Temp.Coeff.of Hc	-0.60%/ °C
Density	7.3-7.5g/cm 3	Electrical Resistivity	114 ¦Ì ¦¸ ..cm
Vickers Hardness	600Hv	Flexural Resistivity	25kg/mm
Tensile Strength	8.0Kg/mm2	Coeff. Of Thermal Expansion	4X10 -6 / °C
Specific Heat	0.12Kcal/Kg	Thermal Conductivity	7.7kcal/[m.h. °C
Young¡¯s Modulus	1.6X10[11]N/m2	Rigidity	0.64N/m2
Poisson¡¯s Ratio	0.24	Compressibility	9.8x10-12m2/N
Curie Temperature	310-340 °C

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