China NdFeB Magnet, Rare Earth Magnet, Neodymium Magnets Factory, Supplier and Manufacturers.

home > Magnet > Magnetic Material > Alnico Magnet

Product detail

  • Product Name:

    Alnico Magnet

  • Model No: Cast Alnico Magnet

Description

What is the Alnico Magnet?
Alnico magnet is one kind of permanent strong magnet, an acronym referring to a family of iron alloys which in addition to iron are composed primarily of aluminium (Al), nickel (Ni) and cobalt (Co), hence al-ni-co. They also include copper, and sometimes titanium. Alnico alloys are ferromagnetic, with a high coercivity (resistance to loss of magnetism) and are used to make permanent magnets. Before the development of rare earth magnets in the 1970s, they were the strongest type of magnet. Other trade names for alloys in this family are: Alni, Alcomax, Hycomax, Columax, and Ticonal.

The composition of alnico alloys is typically 8–12% Al, 15–26% Ni, 5–24% Co, up to 6% Cu, up to 1% Ti, and the balance is Fe. The development of alnico began in 1931, when T. Mishima in Japan discovered that an alloy of iron, nickel, and aluminum had a coercivity of 400 oersted (Oe) (32 kA/m), double that of the best magnet steels of the time.

Alnico alloys make strong permanent magnets, and can be magnetized to achieve strong permanent magnetic fields. As the more commonly available magnets, only rare-earth magnets such as neodymium and samarium-cobalt are stronger. Alnico magnets produce magnetic field strength at their poles as high as 1500 gauss (0.15 tesla), or about 3000 times the strength of Earth’s magnetic field. Some brands of alnico are isotropic and can be efficiently magnetized in any direction. Other types, such as alnico 5 and alnico 8, are anisotropic, with each having a preferred direction of magnetization, or orientation. Anisotropic alloys generally have greater magnetic capacity in a preferred orientation than isotropic types. Alnico’s remanence (Br) may exceed 12,000 G (1.2 T)[clarification needed], its coercivity (Hc) can be up to 1000 oersted (80 kA/m), its energy product ((BH)max) can be up to 5.5 MG·Oe (44 T·A/m). This means alnico can produce a strong magnetic flux in closed magnetic circuit, but has relatively small resistance against demagnetization.

Alnico alloys have some of the highest Curie temperatures of any magnetic material, around 800 °C (1,470 °F), although the maximum working temperature is normally limited to around 538 °C (1,000 °F).They are the only magnet which has useful magnetism even when heated to red-hot.This property, as well as its brittleness and high melting point, is the result of the strong tendency toward order due to intermetallic bonding between aluminium and its other constituents. They are also one of the most stable magnets if they are handled properly. Alnico magnets are electrically conductive, unlike ceramic magnets.

Cast Alnico Magnet Feature:
1. Using patterns and simple moulding techniques, Cast AlNICo Magnet can be cast to form a vast range of complex shapes and sizes at an economical cost.

2. Eclipse Magnetics Alnico magnets are ideal for high temperature applications up to 550ºC

3. Cast AlNICo Magnet is very stable, has good corrosion resistance and a typical hardness of 50 Rockwell C. Once cast, the material is so hard that the only machining possible is grinding

4. Cast AlNICo Magnet represents the most versatile magnet material available. The range of properties can be accurately designed for specific applications by changes to element analysis and heat treatment.

Alnico Magnet Application:
1. ABS braking system magnets
2. ABS braking system magnets
3. Reed switch operating magnets
4. Electricity meter damping magnets
5. Holding/clamping applications
6. Microwave applications
7. Weighing scale damping magnets
8. Electropermanent systems
9. Calibration magnets
10. Heat treatment jigs and fixtures

Part of Our Alnico Magnet Products:

Alnico Bar Magnet alnico cow magnet bar Alnico Education magnets Alnico horseshoe magnet alnico pot magnet alnico small block magnet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Magnetic properties of Cast AlNiCo magnet:

Equivalent
MMPA
Class
Grade
Remanence
Coercive Force
Max.energy
product
Density
Rev. Temp. Coef.
Curie
Temp.
Max.operati
ng Temp.
Br
Hc
(BH)max
D
Br
Hc
Tc
Tw
mT
KGs
KA/M
Oe
KJ/m3
MGOe
g/cm3
%/°C
%/°C
°C
°C
ALNICO 3
LN9
680
6.8
30
380
9
1.13
6.9
-0.03
-0.02
810
450
ALNICO 2
LNG12
720
7.2
45
500
12.4
1.55
7
-0.03
-0.02
810
450
LNG13
700
7
48
600
12.8
1.6
7
-0.03
-0.02
810
450
ALNICO 5
LNG37
1200
12
48
600
37
4.65
7.3
-0.03
-0.02
810
525
LNG40
1250
12.5
48
600
40
5
7.3
-0.02
0.02
860
525
LNG44
1250
12.5
52
650
44
5.5
7.3
-0.02
0.02
860
525
ALNICO 5DG
LNG52
1300
13
56
700
52
6.5
7.3
-0.02
0.02
860
525
ALNICO 5-7
LNG60
1350
13.5
59
740
60
7.5
7.3
-0.02
0.02
860
525
ALNICO 6
LNGT28
1000
10
58
720
28
3.5
7.3
-0.02
0.03
860
525
ALNICO 8HC
LNGT36J
700
7
140
1750
36
4.5
7.3
-0.025
0.02
860
550
ALNICO 8
LNGT18
580
5.8
100
1250
18
2.2
7.3
-0.025
0.02
860
550
ALNICO 8
LNGT32
800
8
100
1250
32
4
7.3
-0.025
0.02
860
550
LNGT40
800
8
110
1380
40
5
7.3
-0.025
0.02
860
550
ALNICO 9
LNGT60
900
9
110
1380
60
7.5
7.3
-0.025
0.02
860
550
LNGT72
1050
10.5
112
1400
72
9
7.3
-0.025
0.02
860
550

related products