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NdFeB

釹鐵硼磁鐵簡介

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.
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.

02.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

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

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

 N33AH

1130-1170

11.3-11.7

10.2

812

35

2785

31-34

247-271

240

 

 

 

04.釹鐵硼磁鐵在汽車工業中的應用。

 

 

 

05.Demagnetization Grap

 

 

 

 

 

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。

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。

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。

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AlZnCr等鍍層;化學氣相沉積CVD)則可形成TiCr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SSTHours

(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

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

++環氧(Ni+Cu+Epoxy)

15~30μm

72~108

+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)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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