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AlNiCo Magnets
MAGNETIC PROPERTIES
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AlNiCo Magnets
Alnico magnets deliver impressive flux density at an economical price. They boast the lowest reversible temperature coefficient of any commercial magnet materials allowing for excellent stability over a wide temperature range. Alnico magnets are also inherently corrosion resistant. Besides commonly used areas like loudspeaker, sensor, magnetic chuck, or magnetic lifter, they are serving for some specialty application owing to its matchless temperature stability.
AlNiCo can be made by either casting or sintering processes. AlNiCo grades mainly vary in Cobalt content and relevant heat treatment process. Cast magnets are larger in density which provide they better magnetic performance. Casting process also well-suited to large and complex shapes. Sintered magnets exhibit slighter lower magnetic performance but better mechanical properties.
| Material |
Maximum energy product (BH)max |
Curie Temperature Tc |
Coefficient of Thermal Expansion | Electrical Resistivity | Density | Hardness | Tensile Modules |
|---|---|---|---|---|---|---|---|
| MGOe | ℃ | 10-6/℃ | μΩ·m | g/cm3 | HRC | kN/mm2 | |
| Cast AlNiCo Magnet | 1.00-5.25 | 760-860 | 11.0-13.0 | 45-75 | 6.9-7.3 | 45-55 | 0.02-0.15 |
| Sintered AlNiCo Magnet | 1.00-12.00 | 810-860 | 11.0-12.4 | 50-70 | 6.8-7.0 | 45 | 0.35-0.45 |
Cast AlNiCo Magnets
Most AlNiCo magnets are belonging to cast type and AlNiCo5 is the most frequently used grade among them. Cast AlNiCo magnet is produced by common foundry processes. Cast AlNiCo magnet can be divided to the isotropic form and anisotropic form base on whether apply the orientation magnetic field during the cooling process. The majority of cast AlNiCo magnet are anisotropic magnet to fully enhance magnetic properties. Therefore, AlNiCo blank will be machined to exact geometry and tolerance after underwent heat treatment process.
Typical magnetic properties of cast AlNiCo magnets
Magnetic properties of different manufacturers vary slightly. Following data are only for reference when designing and selecting materials.
| Grade |
Residual magnetic flux density Br |
Coercive force HcB |
Maximum energy product (BH)max |
Temperature Coefficient ％/℃ |
Curie Temperature Tc |
Work Temperature Tw |
MMPA Standard |
IEC Standard |
||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mT | Gs | KA/m | Oe | kJ/ｍ³ | MGOe | Br | Hcj | ℃ | ℃ | |||
| LN10 | 600 | 6000 | 40 | 500 | 10 | 1.2 | -0.02 | -0.03 | 810 | 450 | AlNiCo3 | AlNiCo10/4 |
| LNG12 | 700 | 7000 | 44 | 550 | 12 | 1.5 | -0.02 | -0.03 | 810 | 450 | AlNiCo2 | AlNiCo12/5 |
| LNG13 | 680 | 6800 | 48 | 600 | 13 | 1.63 | -0.02 | -0.03 | 810 | 450 | AlNiCo13/5 | |
| LNG18 | 900 | 9000 | 48 | 600 | 18 | 2.25 | -0.02 | -0.03 | 850 | 450 | AlNiCo4 | AlNiCo18/5 |
| LNG37 | 1200 | 12000 | 48 | 600 | 37 | 4.63 | -0.02 | -0.03 | 860 | 525 | AlNiCo5 | AlNiCo37/5 |
| LNG40 | 1250 | 12500 | 48 | 600 | 40 | 5 | -0.02 | -0.03 | 860 | 525 | AlNiCo40/5 | |
| LNG44 | 1250 | 12500 | 52 | 650 | 44 | 5.5 | -0.02 | -0.03 | 860 | 525 | AlNiCo44/5 | |
| LNG52 | 1300 | 13000 | 56 | 700 | 52 | 6.5 | -0.02 | -0.03 | 860 | 525 | AlNiCo5DG | AlNiCo52/6 |
| LNG60 | 1330 | 13300 | 60 | 750 | 60 | 7.5 | -0.02 | -0.03 | 860 | 525 | AlNiCo5-7 | AlNiCo60/6 |
| LNGT18 | 580 | 5800 | 90 | 1130 | 18 | 2.25 | -0.02 | -0.03 | 860 | 550 | AlNiCo7 | AlNiCo17/9 |
| LNGT28 | 1000 | 10000 | 58 | 720 | 28 | 3.5 | -0.02 | -0.03 | 860 | 525 | AlNiCo6 | AlNiCo26/6 |
| LNGT32 | 800 | 8000 | 100 | 1250 | 32 | 4 | -0.02 | -0.03 | 860 | 550 | AlNiCo8 | AlNiCo32/10 |
| LNGT38 | 800 | 8000 | 110 | 1380 | 38 | 4.75 | -0.02 | -0.03 | 860 | 550 | AlNiCo38/11 | |
| LNGT44 | 850 | 8500 | 120 | 1500 | 44 | 5.5 | -0.02 | -0.03 | 860 | 550 | AlNiCo44/12 | |
| LNGT48 | 900 | 9000 | 120 | 1500 | 48 | 6 | -0.02 | -0.03 | 860 | 550 | AlNiCo48/12 | |
| LNGT60 | 950 | 9500 | 110 | 1380 | 60 | 7.5 | -0.02 | -0.03 | 860 | 550 | AlNiCo60/11 | |
| LNGT72 | 1050 | 10500 | 112 | 1400 | 72 | 9 | -0.02 | -0.03 | 860 | 550 | AlNiCo9 | AlNiCo72/11 |
| LNGT88 | 1100 | 11000 | 115 | 1450 | 88 | 11 | -0.02 | -0.03 | 860 | 550 | AlNiCo88/12 | |
| LNGT36J | 700 | 7000 | 140 | 1750 | 36 | 4.5 | -0.02 | -0.03 | 860 | 550 | AlNiCo8HC | AlNiCo8HC |
Sintered AlNiCo Magnets
Sintered AlNiCo magnets are manufactured by traditional powder metallurgy technology which basically same as other sintered permanent magnets. Sintered AlNiCo magnets are well adapted for small-sized (less than 28 grams), thin, light, and special shaped magnets. In addition to high dimensional accuracy, tight tolerance, and without further machining steps, sintered AlNiCo magnets also exhibit slightly mechanical strength and machinability. Viewing from the large volume production, sintered AlNiCo magnets have higher material utilization ratio, lower composition segregation, and magnetic performance fluctuation in comparison with cast AlNiCo magnet.
Typical magnetic properties of sintered AlNiCo magnets
Magnetic properties of different manufacturers vary slightly. Following data are only for reference when designing and selecting materials.
| Grade |
Residual magnetic flux density Br |
Coercive force HcB |
Maximum energy product (BH)max |
Temperature Coefficient ％/℃ |
Curie Temperature Tc |
Work Temperature Tw |
MMPA Standard |
IEC Standard |
||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mT | Gs | KA/m | Oe | kJ/ｍ³ | MGOe | Br | Hcj | ℃ | ℃ | |||
| FLN8 | 500 | 5000 | 40 | 500 | 9 | 1.13 | -0.02 | -0.03 | 760 | 450 | AlNiCo3 | AlNiCo8/3 |
| FLNG12 | 700 | 7000 | 48 | 600 | 12 | 1.55 | -0.02 | -0.03 | 810 | 450 | AlNiCo2 | AlNiCo12/5 |
| FLNG18 | 600 | 6000 | 90 | 1130 | 18 | 2.2 | -0.02 | -0.03 | 860 | 450 | AlNiCo7 | AlNiCo18/9 |
| FLNG34 | 1200 | 12000 | 48 | 600 | 34 | 4.25 | -0.02 | -0.03 | 890 | 450 | AlNiCo5 | AlNiCo34/5 |
| FLNG37 | 1250 | 12500 | 48 | 600 | 37 | 4.63 | -0.02 | -0.03 | 890 | 450 | AlNiCo6 | AlNiCo37/6 |
| FLNGT28 | 1050 | 10500 | 60 | 600 | 28 | 3.5 | -0.02 | -0.03 | 850 | 450 | AlNiCo6 | AlNiCo28/6 |
| FLNGT38 | 800 | 8000 | 120 | 1500 | 38 | 4.75 | -0.02 | -0.03 | 850 | 450 | AlNiCo8 | AlNiCo38/12 |
| FLNGT42 | 880 | 8800 | 120 | 1500 | 42 | 5.25 | -0.02 | -0.03 | 820 | 450 | AlNiCo42/12 | |
| FLNGT33J | 700 | 7000 | 140 | 1750 | 33 | 4.13 | -0.02 | -0.03 | 850 | 450 | AlNiCo8HC | AlNiCo33/14 |
The above mentioned data of magnetic properties and physical properties are given at room temperature (20℃).
The max working temperature of magnet is changeable due to length-diameter ratio and other environment factors.
Additional grades are available. Please contact us for information.
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