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Known as third generation of Rare Earth magnets, Sintered neodymium-iron-boron magnet (also known as Neodymium, Neodym, NdFeB, or Neo magnet) is the most widely used type of rare-earth magnet, which is made from an alloy of neodymium, iron, and boron. neodymium magnet is the most powerful commercialized permanent magnets available today, with maximum energy product ranging from 30 MGOe to 52 MGOe, very high remanence and coercivity.

With excellent magnetic properties, abundant raw material and reasonable price, Sintered NdFeB Magnet is used as an ideal magnet in mini motor, permanent magnet instrument, electronics industry, automotive industry, petrochemical, magnetic resonance imaging,sound device, magnetic suspension system, magnetic transmission machine and medical apparatus etc.

For NdFeB, if let it exposed, the iron in the magnet will rust. To protect the magnet from corrosion, it is usually preferable for the magnet to be coated. There are a variety of options, but nickel is the most common and usually preferred. Some other options for coating are zinc and epoxy etc.

烧结钕铁硼性能表
Sintering NdFeB performance table
Item 类别	Grade 性能	Remanence;Br 剩磁				Coercivity;bHc 矫顽力		Intrinsic coercive force; iHc 内禀矫顽力		Max Energy Product;(BH)max 最大磁能积				Density密度	Working Temp 工作温度
		KGs		T		KOe	KA/m	KOe	KA/m	MGOe		KJ/m3		g/cm3	℃
		Max.	Min.	Max.	Min.	KOe	KA/m	KOe	KA/m	Max.	Min.	Max.	Min.	g/cm3	℃
N	N35	12.2	11.7	1.22	1.17	≥11.0	≥876	≥12	≥955	38	34	279	362	7.4-7.6	≤80
	N38	13.0	12.2	1.30	1.22	≥11.0	≥876	≥12	≥955	40	36	318	287	7.5-7.7	≤80
	N40	13.2	12.6	1.32	1.26	≥11.0	≥876	≥12	≥955	42	38	334	302	7.5-7.7	≤80
	N42	13.5	12.9	1.35	1.29	≥11.0	≥876	≥12	≥955	44	40	350	318	7.5-7.7	≤80
	N45	13.8	13.2	1.38	1.32	≥11.0	≥876	≥12	≥955	46	42	366	334	7.5-7.7	≤80
	N48	14.3	13.7	1.43	1.37	≥11.0	≥876	≥12	≥955	49	45	390	358	7.5-7.7	≤80
	N50	14.5	14.0	1.45	1.40	≥11.0	≥836	≥11	≥876	51	47	406	374	7.5-7.7	≤80
	N52	14.8	14.2	1.48	1.42	≥10.5	≥836	≥11	≥876	53	49	422	390	7.5-7.7	≤80
M	N35M	12.2	11.7	1.22	1.17	≥11.2	≥876	≥14	≥1114	38	34	279	263	7.5-7.7	≤100
	N38M	13.0	12.2	1.30	1.22	≥11.5	≥915	≥14	≥1114	40	36	303	287	7.5-7.7	≤100
	N40M	13.2	12.6	1.32	1.26	≥11.8	≥939	≥14	≥1114	42	38	318	303	7.5-7.7	≤100
	N42M	13.5	12.9	1.35	1.29	≥12.1	≥963	≥14	≥1114	44	40	342	326	7.5-7.7	≤100
	N45M	13.8	13.3	1.38	1.33	≥12.4	≥987	≥14	≥1114	46	43	358	342	7.5-7.7	≤100
	N48M	14.3	13.8	1.43	1.38	≥12.8	≥1019	≥14	≥1114	49	46	383	367	7.5-7.7	≤100
	N50M	14.5	14.0	1.45	1.40	≥13.1	≥1043	≥14	≥1114	51	47	406	374	7.5-7.7	≤100
	N52M	14.8	14.2	1.48	1.42	≥13.3	≥1059	≥14	≥1114	53	49	422	390	7.5-7.7	≤100
H	N33H	11.8	11.4	1.18	1.14	≥10.5	≥836	≥17	≥1353	33	31	263	247	7.5-7.7	≤120
	N35H	12.2	11.7	1.22	1.17	≥11.0	≥876	≥17	≥1353	37	33	295	263	7.5-7.7	≤120
	N38H	13.0	12.2	1.26	1.22	≥11.5	≥915	≥17	≥1353	40	36	318	287	7.5-7.7	≤120
	N40H	13.2	12.6	1.29	1.26	≥11.8	≥939	≥17	≥1353	42	38	334	302	7.5-7.7	≤120
	N42H	13.5	12.9	1.32	1.29	≥12.1	≥963	≥17	≥1353	44	40	350	318	7.5-7.7	≤120
	N44H	13.7	13.1	1.37	1.31	≥12.3	≥979	≥17	≥1353	45	41	358	326	7.5-7.7	≤120
	N46H	14.0	13.4	1.40	1.34	≥12.5	≥995	≥17	≥1353	47	43	374	342	7.5-7.7	≤120
	N48H	14.3	13.7	1.40	1.38	≥12.7	≥1011	≥16	≥1274	49	45	390	358	7.5-7.7	≤120
	N50H	14.5	14.0	1.45	1.40	≥12.9	≥1027	≥16	≥1274	51	47	406	374	7.5-7.7	≤120
SH	N30SH	11.3	10.8	1.13	1.08	≥10.2	≥810	≥20	≥1595	31	29	247	220	7.4-7.6	≤150
	N33SH	12.1	11.4	1.21	1.14	≥10.7	≥852	≥20	≥1595	35	31	279	247	7.5-7.7	≤150
	N35SH	12.4	11.7	1.24	1.17	≥11.0	≥876	≥20	≥1595	37	33	295	263	7.5-7.7	≤150
	N38SH	12.9	12.2	1.29	1.22	≥11.5	≥915	≥20	≥1595	40	36	318	287	7.5-7.7	≤150
	N40SH	13.2	12.6	1.32	1.26	≥11.8	≥939	≥20	≥1595	42	38	334	302	7.5-7.7	≤150
	N42SH	13.5	12.9	1.35	1.29	≥12.1	≥963	≥20	≥1595	44	40	350	318	7.5-7.7	≤150
	N44SH	13.7	13.1	1.37	1.31	≥12.3	≥979	≥20	≥1595	45	41	358	326	7.5-7.7	≤150
	N46SH	14.0	13.4	1.40	1.34	≥12.5	≥995	≥20	≥1595	47	43	374	342	7.5-7.7	≤150
UH	N30UH	11.6	10.8	1.16	1.08	≥10.2	≥812	≥25	≥1990	32	28	255	223	7.5-7.7	≤180
	N33UH	12.1	11.4	1.21	1.14	≥10.7	≥852	≥25	≥1990	35	31	279	247	7.5-7.7	≤180
	N35UH	12.4	11.7	1.24	1.17	≥11.0	≥876	≥25	≥1990	37	33	295	263	7.5-7.7	≤180
	N38UH	12.9	12.2	1.29	1.22	≥11.5	≥915	≥25	≥1990	40	36	318	287	7.5-7.7	≤180
	N40UH	13.2	12.6	1.32	1.26	≥11.8	≥939	≥25	≥1990	42	38	334	302	7.5-7.7	≤180
	N42UH	13.5	12.9	1.34	1.29	≥12.1	≥963	≥25	≥1990	44	40	350	318	7.5-7.7	≤180
EH	N28EH	10.9	10.4	1.09	1.04	≥9.7	≥772	≥30	≥2388	29	26	231	207	7.5-7.7	≤200
	N30EH	11.5	10.8	1.15	1.08	≥10.2	≥812	≥30	≥2388	32	28	255	223	7.5-7.7	≤200
	N33EH	12.1	11.4	1.21	1.14	≥10.7	≥851	≥30	≥2388	35	31	279	247	7.5-7.7	≤200
	N35EH	12.4	11.7	1.24	1.17	≥11.0	≥876	≥30	≥2388	37	33	295	263	7.5-7.7	≤200
	N38EH	12.9	12.2	1.29	1.22	≥10.5	≥915	≥30	≥2388	40	36	318	287	7.5-7.7	≤200
AH	N28AH	11.2	10.4	1.12	1.04	≥9.7	≥772	≥35	≥2786	30	26	239	207	7.5-7.7	≤230
	N30AH	11.5	10.8	1.15	1.08	≥10.2	≥812	≥35	≥2786	32	28	255	223	7.5-7.7	≤230
	N33AH	12.1	11.4	1.21	1.14	≥10.7	≥852	≥35	≥2786	35	31	279	247	7.5-7.7	≤230

烧结钕铁硼物理特性
Sintering NdFeB physical properties
Item 项目	Parameters 参　数	Reference Value 参考值
辅助磁性能Additional magnetic properties	剩磁温度系数(α(Br))/(%/K)	-0.08～-0.12
	内禀矫顽力温度系数(α(Hcj)/%/K)	-0.42～-0.70
	居里温度(Tc)/K	310～380
	回复磁导率(μrec) [ - ]	1.05
机械物理特性Mechanical and Physical Properties	密度/(g/cm3) Density	7.50～7.70
	维式硬度(Hv) Vickers Hardeness	650
	电阻率/(μΩom) Electrical Resistivity	1.4
	抗压强度/MPa Compressive strength	1050
	抗拉强度/MPa Tensile strength	80
	抗弯强度/MPa Bending Strength	290
	热传导率/(W/(moK) )Thermal Conductivity	6～8
	杨氏模量/GPa Young's modulus	160
	热膨胀系数（垂直于取向方向）/(10-6/K) Coefficient of Thermal Expansion（C丄）	-1.5
	热膨胀系数（平行于取向方向）/(10-6/K) Coefficient of Thermal Expansion（C//）	6.5

磁性材料表面镀层 Magnetic material surface finishes
表面处理　　Surface	履层　　　　　　Coaging	履层厚度（μm）　　Shoe layer thickness	颜色Color	抗腐蚀性比较 Corrosion resistance compared
钝化　　　Passivation		1	银灰Silver grey	临时保护 Temporary protection
镀镍　　　　　Nickel	Ni+Ni	10-20	亮银色 Silver bright	抗湿性能优秀 Excellent to humidity
镀镍　　　　　Nickel	Ni+Cu+Ni	10-20	亮银色 Silver bright	抗湿性能优秀 Excellent to humidity
镀锌　　　　　　Zinc	Zn	8-20	蓝锌 Shining light blue	抗盐雾性能好 Good to salt spray
镀锌　　　　　　Zinc	Color Zn		彩锌Shining color	抗盐雾性能优秀 Excellent to salt spray
镀锡　　　　　　Tic	Ni+Cu+Sn	15-20	银色 Silver	抗湿性能很强 Superior to humidity
镀金　　　　　Aurum	Ni+Cu+Au	10-20	金色 Shining gold	抗湿性能很强 Superior to humidity
镀铜　　　　　Copper	Ni+Cu	10-20	金色 Shining gold	临时保护 Temporary protection
环氧　　　　　Epoxy	Expoxy	15-25	黑，红，灰　Black,Red,Gray	抗湿和盐性能优秀 Excellent to climate humidity and salt spray
	Ni+Cu+Expoxy			抗湿和盐性能优秀 Excellent to climate humidity and salt spray
	Zn+Expoxy
气相沉积　　　Chemical	Ni	10-20	银灰 Silvergrey	抗湿性能优秀 Excellent to humidity
聚对二甲苯沉积Parylene	Parylene	5-20	灰色Grey	抗湿和盐性能优秀，搞溶解，毒气，霉气，菌，FDA认可Excellent to climate humidity and salt spray.Good to melt,gas, mildew, bacterium,FDA certification