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NdFeB magnets:
NdFeB magnets that appeared at the early of 1980 are recognized as the third generation rare earth permanent magnets and the magnetic force is the most powerful. It can be divided into Sintering NdFeB magnets and Bonded NdFeB magnets.
It possesses high toughness,good ability of resisting corrosion and temperature.
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.
NdFeB magnets applied range:
Acoustic: loudhailer, receiver, microphone, annunciator, sound stage, car audio etc.
Electronics: watt-hour meter, water meter, noise meter,transducer etc,
Motor: VCM,CDDVD-ROM,dynamo, electromotor, servo motor, Pilot motors, motor, vibrator motor.
Machinery and equipment: magnetic separator, magnetic hanging.
Alnico magnets
AlNiCo magnets (Cast AlNiCo Magnets - Sintered AlNiCo Magnets), are made up of a composite of aluminum, nickel and cobalt with small amounts of other elements, have good temperature stability, good resistance to demagnetization, high residual induction, and relatively high energies. By strength, they are much weaker than NdFeB magnets, SmCo magnets and Ferrite magnets.
Alnico magnets are produced by two typical methods, casting or sintering. Casting delivers higher energy products and allows for the design of intricate shapes. Sintering is usually restricted to smaller sizes and offers slightly lower magnetic properties, but has tighter dimensional tolerances due to its processing.
AlNiCo magnets can be produced with either isotropic or anisotropic properties. Alnico 5 and Alnico 8 are anisotropic and exhibit a preferred direction of orientation, Magnetic orientation should be specified on your drawing when you send an order to us. Cast Alnico 5 is the most commonly used of all the cast Alnico’s. It combines high indications with a high energy product of 5 MGOe or more and is used extensively in rotation machinery, communications, meters and instruments, sensing devices and holding applications.
AlNiCo magnets have wide range of working temperatures, up to 550oC. They have experienced renewed interest in recent years in such temperature-sensitive applications as hall-effect and MR-based automotive and electronic sensors, in addition to the traditional magnetron, TWT amplifiers, actuators, motors and instruments applications that have long relied upon AlNiCo.
The Characteristics of Alnico Magnet:
*Small changes in magnetic properties to temperature effects
*Maximum working temperature can be as high as 450oC~550oC.
*Low coercive force.
*Strong corrosion resistance capability, no coating needed for surface protection.
• Suitable for small volume magnets with complex shape
• Compact crystal, high intensity
• Regular shape, precision size
• Even elements, stable performance
• Suitable for compound magnet
• Excellent temperature stability temp. coefficient of Br is the smallest among all of the other
permanent magnets.
Casting Alnico magnets are suitable for being used in instrument, meter, micro-motor, electro-acoustic device, microwave device and magnetic drive unit etc.
Samarium Cobalt Magnets (SmCo)
samarium cobalt (SmCo) magnets typically fall into two families of materials. They include rare earth Sm1Co5 and Sm2Co17 and are referred to as 1:5 and 2:17 materials. There’re three different manufacturing processes: sintered SmCo magnet, bonded SmCo magnet, and injection moulding SmCo magnet. SmCo magnet is high performance, low temperature coefficient permanent made of samarium and cobalt and other rare-earth elements. Its biggest advantage is high working temperature-300 degree centigrade. It need to be coated because it is difficult to be eroded and oxidized. SmCo magnet is widely used in motor, watch, transducers, instruments, positional detector, generator, radar, etc
Sintered SmCo Magnet, SmCo Permanent Magnet, Magnet Material for Satisfy The Customers’Need
Magnetic Properties of SmCo
Grade |
Max. Energy Product |
Remanence |
Coercive Force |
Rev. Temp. Coeff. |
Working Temp. |
Density | ||||||
|
(BH)max |
Br |
Hc |
Hci |
Bd |
Hd |
Tw |
D | |||||
|
MGOe |
kJ/m3 |
kG |
mT |
kOe |
kA/m |
kOe |
kA/m |
%/oC |
%/oC |
oC |
g/cm3 | |
|
SmCo5 16A |
16.0 |
130.0 |
8.2 |
820 |
7.5 |
600 |
>16.0 |
>1270 |
-0.05 |
0.25 |
250 |
8.4 |
|
SmCo5 16B |
16.0 |
130.0 |
8.2 |
820 |
7.5 |
600 |
>20.0 |
>1590 |
-0.05 |
0.25 |
250 |
8.4 |
|
SmCo5 18A |
18.0 |
146.3 |
8.7 |
870 |
8.2 |
656 |
>16.0 |
>1272 |
-0.05 |
0.25 |
250 |
8.4 |
|
SmCo5 18B |
18.0 |
146.3 |
8.7 |
870 |
8.2 |
656 |
>20.0 |
>1590 |
-0.05 |
0.25 |
250 |
8.4 |
|
SmCo5 20A |
20.0 |
162.5 |
9.0 |
900 |
8.6 |
690 |
>16.0 |
>1272 |
-0.05 |
0.25 |
250 |
8.4 |
|
SmCo5 20B |
20.0 |
162.5 |
9.0 |
900 |
8.6 |
690 |
>20.0 |
>1590 |
-0.05 |
0.25 |
250 |
8.4 |
|
SmCo5 22A |
22.0 |
178.8 |
9.5 |
950 |
9.1 |
728 |
>16.0 |
>1272 |
-0.05 |
0.25 |
250 |
8.4 |
|
SmCo5 22B |
22.0 |
178.8 |
9.5 |
950 |
9.1 |
728 |
>20.0 |
>1590 |
-0.05 |
0.25 |
250 |
8.4 |
|
Sm2Co17 24 |
24.0 |
195.0 |
10.0 |
1000 |
9.5 |
760 |
>20.0 |
>1590 |
-0.03 |
0.23 |
300 |
8.3 |
|
Sm2Co17 26A |
26.0 |
211.3 |
10.6 |
1060 |
9.8 |
784 |
>16.0 |
>1272 |
-0.03 |
0.23 |
300 |
8.3 |
|
Sm2Co17 26B |
26.0 |
211.3 |
10.6 |
1060 |
9.8 |
784 |
>20.0 |
>1590 |
-0.03 |
0.23 |
300 |
8.3 |
|
26.0 |
211.3 |
10.6 |
1060 |
9.8 |
784 |
>26.0 |
>2067 |
-0.03 |
0.23 |
300 |
8.3 | |
|
Sm2Co1728A |
28.0 |
227.5 |
10.9 |
1090 |
10.0 |
800 |
>16.0 |
>1272 |
-0.03 |
0.23 |
300 |
8.3 |
|
Sm2Co17 28B |
28.0 |
227.5 |
10.9 |
1090 |
10.0 |
800 |
>20.0 |
>1590 |
-0.03 |
0.23 |
300 |
8.3 |
|
Sm2Co17 28H |
28.0 |
227.5 |
10.9 |
1090 |
10.0 |
800 |
>26.0 |
>2067 |
-0.03 |
0.23 |
300 |
8.3 |
|
Sm2Co17 30A |
30.0 |
243.8 |
11.0 |
1100 |
10.2 |
816 |
>16.0 |
>1272 |
-0.03 |
0.23 |
300 |
8.3 |
|
Sm2Co17 30B |
30.0 |
243.8 |
11.2 |
1120 |
10.2 |
816 |
>20.0 |
>1590 |
-0.03 |
0.23 |
300 |
8.3 |
|
Sm2Co17 32 |
31.0 |
251.8 |
11.5 |
1150 |
10.0 |
800 |
>15.0 |
>1192 |
-0.03 |
0.23 |
300 |
8.3 |
|
Sm2Co17 25H |
25.0 |
203.2 |
10.5 |
1050 |
9.7 |
776 |
>35.0 |
>2782 |
-0.03 |
0.23 |
375 |
8.3 |
1.SmCo permanent magnet has high magnetic energy product and high coercive force. Its properties are better than Alnico, ferrite permanent magnet. Its max. energy product is up to 239kJ/m3(30MGOe), which is three times of that of AlNiCo8 permanent magnet, eight times of that of ferrite permanent magnet (Y40). So the permanent magnetic component made from SmCo material is small, light and stable in property. It is widely applied to electro acoustic& telecommunication apparatus, electric motors, measure meters, peg-top electronic watch, microwave apparatus, magnetic mechanism, sensor and other static or dynamic magnetic routes.
2.The curie temp. of the SmCo permanent magnet is high and its temp. Coeff. is low. So it is suitable for use at 300, high temp.
3.SmCo permanent magnet is hear and bristle. Its rigidity strength, tensile strength and press strength are low. So it is not suitable for framework.
4.The main ingredient of SmCo permanent magnet is metal cobalt(CoY99.95%). So its price is high.
The characteristics of Samarium Cobalt Magnet
*Very high magnetic properties with good stability.
*Superior resistance to high temperature, Curie temperature of majority is over 800?? *Excellent corrosion resistance capability, no coating is needed for surface protection.
Sintered Ferrite Magnet
Ferrite magnets are ceramics that are stronger by weight than steel or Alnico equivalents but less so than neodymium magnets. Like all ceramics, they are quite brittle & will easily break if dropped onto a hard surface. They are an economical choice for use with conveyor belts to extract stray metal.
Ferrite magnets are also good for doing repulsion and attraction experiments since some of the rare earth magnets may be too strong and steel bar magnets will demagnetize. The plain ferrites shown below are all magnetized through their thickness.
Material name |
Y30BH | HF28/28 | FB6H | Y30H-1[C-8] | Y30H-2 | Y36 | C-8B | C-8C | |
| Compound SrO6Fe2O3 | |||||||||
| Left magnet density Br | [MT] | >=380 | >=385 | >=390 | >=385 | >=400 | >=410 | >=420 | >=430 |
| [KG] | >=3.8 | >=3.85 | >=3.9 | >=3.85 | >=4.0 | >=4.1 | >=4.2 | >=4.3 | |
| Magnetic induction coercive force Hcb | [KA/m] | >=224 | >=270 | >=267 | >=235 | >=275 | >=220 | >=230 | >=200 |
| [Koe] | >=2.8 | >=3.4 | >=3.3 | >=2.95 | >=3.45 | >=2.76 | >=2.8 | >=2.5 | |
| Inner coercive force Hcj | [KA/m] | >=232 | >=280 | >=315 | >=245 | >=310 | >=225 | >=240 | >=205 |
| [Koe] | >=2.9 | >=3.5 | >=3.9 | >=3.07 | >=3.89 | >=2.85 | >=3.0 | >=2.5 | |
| Max magnet energy [BH]max | [KJ/m3] | >=27.25 | >=28 | >=29.8 | >=30.02 | >=31.6 | >=31.6 | >=32.5 | >=34.2 |
| [KGOe] | >=3.1 | >=3.5 | >=3.7 | >=3.8 | >=4.0 | >=4.0 | >=4.1 | >=4.3 | |
| Relative reversion magnet ratio urec | 1.05~1.1 | 1.05~1.1 | 1.05~1.1 | 1.05~1.1 | 1.05~1.1 | 1.05~1.1 | 1.05~1.1 | 1.05~1.1 | |
| Left temperature coefficient ¦¤Br/¦¤rB/T |
(%K) | -0.18 | -0.18 | -0.18 | -0.18 | -0.18 | -0.18 | -0.18 | -0.18 |
| [%¡ãC] | -0.18 | -0.18 | -0.18 | -0.18 | -0.18 | -0.18 | -0.18 | -0.18 | |
| Courier temperature Tc |
(K) | 733 | 733 | 733 | 733 | 733 | 733 | 733 | 733 |
| [¡ãC] | 460 | 460 | 460 | 460 | 460 | 460 | 460 | 460 | |
| Hot inflated coefficient ¦¤L/L¦¤T |
C//*(1/K) [1/¡ãC] |
(9~9.5) x10-6 |
(9~9.5) x10-6 |
(9~9.5) x10-6 |
(9~9.5) x10-6 |
(9~9.5) x10-6 |
(9~9.5) x10-6 |
(9~9.5) x10-6 |
(9~9.5) x10-6 |
| C?*(1/K) [1/oC] |
10x10-6 | 10x10-6 | 10x10-6 | 10x10-6 | 10x10-6 | 10x10-6 | 10x10-6 | 10x10-6 | |
| Specific heat | (J/Kg.K) | 837 | 837 | 837 | 837 | 837 | 837 | 837 | 837 |
| [Cal/goC] | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | |
| Sinter density | (Kg/m3) | (4.85~5.0) x103 | (4.85~5.0) x103 |
(4.85~5.0) x103 | (4.85~5.0) x103 | (4.85~5.0) x103 | (4.85~5.0) x103 | (4.85~5.0) x103 |
(4.85~5.0) x103 |
| (g/m3) | 4.85~5.0 | 4.85~5.0 | 4.85~5.0 | 4.85~5.0 | 4.85~5.0 | 4.85~5.0 | 4.85~5.0 | 4.85~5.0 | |
| Anti-fold intensity | (N/m2) | (0.5~0.9) x108 | (0.5~0.9) x108 |
(0.5~0.9) x108 | (0.5~0.9) x108 | (0.5~0.9) x108 | (0.5~0.9) x108 | (0.5~0.9) x108 |
(0.5~0.9) x108 |
| (Kgf/mm2) | 5~9 | 5~9 | 5~9 | 5~9 | 5~9 | 5~9 | 5~9 | 5~9 | |
| Compressed intensity | (N/m2) | >6.9x108 | >6.9x108 | >6.9x108 | >6.9x108 | >6.9x108 | >6.9x108 | >6.9x108 | >6.9x108 |
| (Kgf/mm2) | >70 | >70 | >70 | >70 | >70 | >70 | >70 | >70 | |
| Cut intensity | (N/m2) | (0.2~0.5) x108 | (0.2~0.5) x108 |
(0.2~0.5) x108 | (0.2~0.5) x108 | (0.2~0.5) x108 | (0.2~0.5) x108 | (0.2~0.5) x108 |
(0.2~0.5) x108 |
| (Kgf/mm2) | 2~5 | 2~5 | 2~5 | 2~5 | 2~5 | 2~5 | 2~5 | 2~5 | |
Magnetic Assemblies
Ningbo YiLi Magnet Co.,Ltd always tries our best to provide different holding magnets, offers excellent selection of magnetic tools, permanent magnets and industrial magnetic devices for home use, office use, industrial use, computer use and so on. Both our office and factory are located in Ningbo which is very developed city and very big seaport. Our products are listed as following:
Magnet material
Factory Add:Tengyuan Village,Science and Technology Zone,Ningbo China.
Office Add:12/F,Chuangchun Mansion No.159,LingQiao Road Ningbo 315000 China
Web:http://www.magnetmaterialyl.com
Tel: +86-574-87932448 Fax:+86-574-87932448
Contact person:Bella
E-mail:sales@MagnetMaterialyl.com ,nbyilimagnetic@gmail.com