NdFeB

Neodymium magnet, also known as NdFeB magnet or Neo magnet, is one of the highest property and strongest permanent magnet by now, are made through powder metallurgy manufacturing techniques. They are mainly composed of neodymium(32%), iron(64%), boron(1%), and a few quantity rare earth material, such as Dy, Tb, Co, Nb, Ga, Al, Cu,etc. Neodymium magnet is regarded as “Magnet King” due to its recorded high remanence, coercive force and maximum energy product.

Q'ty :

Neodymium magnet is regarded as “Magnet King” due to its recorded high remanence, coercive force and maximum energy product. Initially, NdFeB magnets were primarily used for making VCM’s (voice coil motors) in hard disk drives. Now they are widely used in many fields, such as automotive industry, communication tools, engineering equipment, medical equipment, audio apparatus and household etc. And with Neodymium magnet rapid development, many high-tech products were developed. With advanced scientific research and production equipments, we can supply various dimension neodymium magnets with high property and enduring high temperature.

Besides normal N35 ~ N52, temperature stability magnets could reach 50M, 48H, 45SH, 42UH, 40EH, 33AH. Also, to bear special working environment, we supply low weight loss magnet.

Features of Neodymium Magnet：

1. Super strong Br Resident induction.

2. Excellent demagnetization resistance capability.

3. Reasonable Price relative to its high magnetic properties.

4. Coating is necessary for NdFeB.

Production Process

類別 Type	性能 Grade	剩磁		矯頑力		內稟矯頑力		最大磁能積		工作溫度 Tw.
		Br		BHc		IHc		(BH)max		工作溫度 Tw.
		mT	KG	KOe	KA/m	KOe	KA/m	MGOe	KJ/m³	℃
N	N35	1170-1220	11.7-12.2	≧10.9	≧868	≧12	≧955	33-36	263-287	≤80℃
	N38	1220-1250	12.2-12.5	≧11.3	≧899	≧12	≧955	36-39	287-310	≤80℃
	N40	1250-1280	12.5-12.8	≧11.4	≧907	≧12	≧955	38-41	302-326	≤80℃
	N42	1280-1320	12.8-13.2	≧11.5	≧915	≧12	≧955	40-43	318-342	≤80℃
	N45	1320-1380	13.2-13.8	≧11.6	≧923	≧12	≧955	43-46	342-366	≤80℃
	N48	1380-1420	13.8-14.2	≧11.6	≧923	≧12	≧955	46-49	366-390	≤80℃
	N50	1400-1450	14.0-14.5	≧10.0	≧796	≧11	≧876	48-51	382-406	≤80℃
	N52	1430-1480	14.3-14.8	≧10.0	≧796	≧11	≧876	50-53	398-422	≤80℃
M	N35M	1170-1220	11.7-12.2	≧10.9	≧868	≧14	≧1114	33-36	263-287	≤100℃
	N38M	1220-1250	12.2-12.5	≧11.3	≧899	≧14	≧1114	36-39	287-310	≤100℃
	N40M	1250-1280	12.5-12.8	≧11.6	≧923	≧14	≧1114	38-41	302-326	≤100℃
	N42M	1280-1320	12.8-13.2	≧12.0	≧955	≧14	≧1114	40-43	318-342	≤100℃
	N45M	1320-1380	13.2-13.8	≧12.5	≧955	≧14	≧1114	43-46	342-366	≤100℃
	N48M	1360-1430	13.6-14.3	≧12.9	≧1027	≧14	≧1114	46-49	366-390	≤100℃
	N50M	1400-1450	14.0-14.5	≧13.0	≧1033	≧14	≧1114	48-51	382-406	≤100℃
H	N33H	1130-1170	11.3-11.7	≧10.5	≧836	≧17	≧1353	31-34	247-271	≤120℃
	N35H	1170-1220	11.7-12.2	≧10.9	≧868	≧17	≧1353	33-36	263-287	≤120℃
	N38H	1120-1250	12.2-12.5	≧11.3	≧899	≧17	≧1353	36-39	287-310	≤120℃
	N40H	1250-1280	12.5-12.8	≧11.6	≧923	≧17	≧1353	38-41	302-326	≤120℃
	N42H	1280-1320	12.8-13.2	≧12.0	≧955	≧17	≧1353	40-43	318-342	≤120℃
	N45H	1300-1360	13.0-13.6	≧12.0	≧955	≧17	≧1353	43-46	342-366	≤120℃
	N48H	1370-1430	13.7-14.3	≧12.5	≧955	≧17	≧1353	46-49	366-390	≤120℃
SH	N30SH	1080-1130	10.8-11.3	≧10.1	≧804	≧20	≧1592	28-31	223-247	≤150℃
	N33SH	1130-1220	11.3-12.2	≧10.6	≧844	≧20	≧1592	31-34	247-271	≤150℃
	N35SH	1170-1220	11.7-12.2	≧11.0	≧876	≧20	≧1592	33-36	263-287	≤150℃
	N38SH	1220-1250	12.2-12.5	≧11.4	≧907	≧20	≧1592	36-39	287-310	≤150℃
	N40SH	1240-1280	12.4-12.8	≧11.8	≧939	≧20	≧1592	38-41	302-326	≤150℃
	N42SH	1280-1320	12.8-13.2	≧12.4	≧987	≧20	≧1592	40-43	318-342	≤150℃
	N45SH	1320-1380	13.2-13.8	≧12.6	≧1003	≧20	≧1592	43-46	342-366	≤150℃
UH	N30UH	1080-1130	10.8-11.3	≧10.2	≧812	≧25	≧1990	28-31	223-247	≤180℃
	N33UH	1130-1170	11.3-11.7	≧10.7	≧852	≧25	≧1990	31-34	247-271	≤180℃
	N35UH	1180-1220	11.8-12.2	≧10.8	≧860	≧25	≧1990	33-36	263-287	≤180℃
	N38UH	1220-1250	12.2-12.5	≧11.3	≧899	≧25	≧1990	36-39	287-310	≤180℃
	N40UH	1250-1280	12.5-12.8	≧11.3	≧899	≧25	≧1990	38-41	302-326	≤180℃
	N42UH	1280-1320	12.8-13.2	≥ 12.4	≧899	≥ 25	≧1990	40-43	326-350	≤180℃
EH	N30EH	1080-1130	10.8-11.3	≧10.2	≧812	≧30	≧2388	28-31	223-247	≤200℃
	N33EH	1130-1170	11.3-11.7	≧10.5	≧832	≧30	≧2388	31-34	247-271	≤200℃
	N35EH	1170-1220	11.7-12.2	≧11.0	≧876	≧30	≧2388	33-36	263-287	≤200℃
	N38EH	1220-1260	12.2-12.6	≧11.3	≧899	≧30	≧2388	36-39	287-310	≤200℃
	N40EH	1260-1300	12.6-13.0	≧11.8	≧939	≧30	≧2388	38-43	302-342	≤200℃
AH	N30AH	1080-1130	10.8-11.3	≧10.2	≧812	≧35	≧2785	28-31	223-247	≤240℃
AH	N33AH	1130-1170	11.3-11.7	≧10.2	≧812	≧35	≧2785	31-34	247-271	≤240℃

Surface Treatment of NdFeB magnet

NdFeB magnets are susceptible to corrosion, so it is necessary to give surface treatment Currently, the surface treatments mainly includes chemical plating, conversion coating and coating. In most cases, NdFeB magnet surface are treated with NiCuNi (Nickel-Copper-Nickel) plating, Zinc plating and Epoxy coating. For special requirements, passivation and phosphatization are also adopted.

釹鐵硼磁鐵電鍍

釹鐵硼作為稀土永磁材料的一種具有極高的磁能積和矯頑力，同時高能量密度的優點使釹鐵硼永磁材料在現代工業和電子技術中獲得了廣泛應用，從而使儀器儀錶、電聲電機、磁選磁化等設備的小型化、輕量化、薄型化成為可能。釹鐵硼的優點是性價比高，具良好的機械特性；釹鐵硼中含有大量的稀土元素釹、鐵及硼，其特性硬而脆。同時，釹等稀土金屬非常活潑，使材料易於粉化腐蝕，必須通過採取表面處理方法或調整其化學成分使之得以改進，才能達到實際應用的要求。由於調整成分會改變其性能等，所以表面處理比較重要。

目前，釹鐵硼磁體的表面處理主要有電鍍（化學鍍）、轉化膜、塗層和氣相塗層等幾個方面。

一、電鍍

釹鐵硼電鍍最主要的是鍍鎳和鍍鋅。

鍍鎳根據鍍層結構不同，分為單鎳、雙鎳、鎳銅鎳等；根據外觀色澤不同，分暗鎳、半光亮鎳和光鎳。一般鍍鎳層為鎳銅鎳的亮鎳和半光亮鎳居多。鍍鎳的優點是鍍層較耐磨、耐環境性好等，比較差的是鎳層是鐵磁性物質，對磁性能有一定的影響，對薄小產品特別明顯，改進辦法是用部分銅層替代。化學鎳和電鍍鎳磷合金的鐵磁性較弱，但是退鍍比較麻煩，一般不作為主流鍍層供用。

化學鎳相對比電鍍鎳鎳層比較均勻，但是，目前尚不能在釹鐵硼的基體上直接施鍍，而且化學鎳使用大量的絡合劑、還原劑且鍍液壽命短、施鍍推動力低、能耗高，因此也不能作主流鍍層。

鍍鎳後產品，根據對鍍層的要求，還可以鍍金、銀、錫、代鉻、仿金、黑鎳等鍍層。

釹鐵硼鍍鋅一般採用採用氯化物鍍鋅，從國內產量上看，鍍鋅是最大的鍍種，特別是電動自行車磁鋼的電鍍更為突出。鍍層優點是便宜、方便、鋅層不是鐵磁性的。缺點是耐磨性、耐候性不如鍍鎳層。鍍鋅後鍍層一般要進行鈍化處理，由於淘汰了六價鉻鈍化，目前常用的鈍化是三價鉻藍白鈍化和三價鉻彩色鈍化。當然，鍍鋅層鈍化也可以象五金件一樣更加豐富；但是，目前主流是三價鉻藍白鈍化。

電鍍層還有人使用過鋅鎳合金等，不過，到目前尚不能成為釹鐵硼電鍍的一種常規鍍種。

二、轉化膜

釹鐵硼的轉化膜主要有磷化和鈍化膜，由於轉化膜屬於工間保護膜等，用於長期，許多產品會有閃鏽等現象。

三、塗層

這裡所指的塗層是指用電泳、噴塗、刷塗和浸塗等工藝的鍍層，不包括氣相塗層。目前比較普遍的塗層有環氧漆塗層，其次分別是Everlube塗層、特氟龍塗層、無鉻達克羅塗層。

環氧塗層由於塗料品種的不同，耐鹽霧試驗、硬度、色澤等都有不同。Everlube塗層一般呈有金屬光澤的金黃色，是美國生產的一種固體潤滑膜改進過來的，塗層綜合性能非常優秀，已商品化。特氟龍塗層也已商品化。先進的無鉻達克羅也是一種有望替代電鍍的一種鍍層。

氣相塗層包括物理氣相沉積(PVD)法，物理氣相沉積又分蒸發鍍、濺射鍍、離子鍍三類，可形成Al、Zn、Cr等鍍層；化學氣相沉積CVD)則可形成Ti、Cr等的氮化物、碳化物鍍層；化學氣相沉積（CVD）聚合類塗層派瑞霖等。

鍍種(Surface)	鍍層(Coating)	厚度(Thickness)	顏色(Color）	鹽霧試驗SST（Hours）
鎳(Nickel)	鎳銅鎳（Ni+Cu+Ni)	10~20μm	銀白色（Bright Silver)	24~72
特黑鎳（Black Nickel)	鎳+銅+黑鎳（Ni+Cu+Ni)	10~20μm	亮黑色（Bright Black)	48~96
環保鋅（Cr3+Zinc)	藍白鋅（Zn)	5~8μm	藍白色（Blue white)	16~48
環保鋅（Cr3+Zinc)	彩鋅（CZn）	5~8μm	彩色（Color)	36~72
錫（Sn)	鎳銅鎳+錫（Ni+Cu+Ni+Sn)	10~25μm	銀色 (Silver)	36~72
金（Au）	鎳銅鎳+金（Ni+Cu+Ni+Au)	10~20μm	金色 (Gold)	12
銀（Ag）	鎳銅鎳+銀（Ni+Cu+Ni+Ag)	10~20μm	銀色 (Silver)	12
環氧樹脂（Epoxy)	環氧（Exopy)	10~20μm	黑色/灰色（Black/Grey）	48
	鎳+銅+環氧（Ni+Cu+Epoxy)	15~30μm		72~108
	鋅+環氧（Zn+Epoxy)	15~25μm		72~108
鈍化（Passivation)	////	1~3μm	黑灰色(Dark Grey)	臨時保護（temporary protection）
磷化（Phosphate)	////	1~3μm	黑灰色(Dark Grey)	臨時保護（temporary protection）