Products

Alnico Rare Earth Magnets

Overview
Alnico magnetic material is an alloy of aluminum-nickel-cobalt which possesses an excellent temperature stability and high residual induction. However, its low coercive force limits its applications in many cases. Casting and sintering are two major processes used to manufacture the Alnico magnets.

Applications
Alnico magnets are usually used in motor, aerospace, military, communication devices, holding magnets, separators, sensors, security systems, MRI Relays Magnetos, etc.

  • Arc Alnico Magnes

    Arc Alnico Magnes
  • Block Alnico Magnets

    Block Alnico Magnets
  • Disc / Rod Alnico Magnets

    Disc / Rod Alnico Magnets
  • Ring Alnico Magnets

    Ring Alnico Magnets
  • Irregular Alnico Magnets

    Irregular Alnico Magnets

Cast AlNiCo magnet properties - USA standard
Grade Residual Induction
Br.
Coercive Force
Hcb.
Intrinsic Coercive Force
Hcj.
Max. Energy Product
BH.
Density % change Per C Tw Max Remark
kGs mT Oe kA/m Oe kA/m KJ/m3 MGOe g/cm3 %K
AlNiCo1 7.2 720 470 37 480 38 11.1 1.4 6.9 -0.03 450 Isotropic
AlNiCo2 7.5 750 560 45 580 46 13.5 1.7 7.1 -0.03 450
AlNiCo3 7.0 700 480 38 500 40 10.7 1.35 6.9 -0.03 450
AlNiCo5 12.8 1280 640 51 640 51 43.8 5.5 7.3 +0.02 525 Anisotropic
AlNiCo5DG 13.3 1330 670 53 670 53 57.7 6.5 7.3 +0.02 525
AlNiCo5-7 13.5 1350 740 59 740 59 59.7 7.5 7.3 +0.02 525
AlNiCo6 10.5 1050 780 62 800 64 31.0 3.9 7.3 +0.02 525
AlNiCo8 8.2 820 1650 131 1860 148 42.2 5.3 7.3 +0.02 550
AlNiCo8HC 7.2 720 1900 151 2170 173 39.8 5.0 7.3 +0.02 550
AlNiCo9 10.6 1060 1500 119 1500 119 71.6 9.0 7.3 +0.02 550


Cast Alnico Magnet Typical Magnetic Performance Range - other standard
Grade Residual Induction
Br.
Coercive Force
Hcb.
BHmax USA stand IEC stand DIN stand UK stand
kGs mT Oe kA/m KJ/m3 MGOe MMPA IEC DE UK
LN10 6.5 650 530 42 10 1.2 AlNiCo3 AlNiCo9/3 / /
LNG11 7.2 720 480 37 11.2 1.4 AlNiCo1 AlNiCo8/4 AlNiCo120 AlNi
LNG13 7.0 700 620 50 13 1.6 AlNiCo2 AlNiCo12/6 AlNiCo160 AlNiCo
LNGT18 5.8 580 1250 100 18 2.2 I. AlNiCo 8 AlNiCo17/9 / /
LNG16 8.0 800 660 53 16 2.0 [AlNiCo4] / / /
LNG34 11.8 1180 550 44 34 4.25 [AlNiCo5C] / / /
LNG37 12.0 1200 600 48 37 4.65 AlNiCo37/5 AlNiCo500 Alcomax2
LNG40 12.2 1220 630 50 40 5.0 AlNiCo5 / /
LNG44 12.5 1250 650 52 44 5.5 AlNiCo44/5 Alcomax3
LNG52 13.0 1300 690 55 52 6.5 AlNiCo5DG AlNiCo52/6 AlNiCo600 Alcomax3 S.C.
LNG60 13.3 1330 750 60 60 7.5 AlNiCo5-7 / AlNiCo700 Columax
LNGT28 10.5 1050 700 56 28 3.5 AlNiCo6 AlNiCo26/6 AlNiCo400 Alcomax4
LNGT30 10.5 1050 750 60 30 3.75
LNGT32 8.0 800 1280 102 32 4.0 AlNiCo8 AlNiCo38/11 AlNiCo350 Hycomax2
LNGT40 8.2 820 1400 112 40 5.0
LNGT44 8.8 880 1540 123 44 5.5 AlNiCo8B / AlNiCo450 Hycomax3
LNGT48A 9.3 930 1540 123 48 6.0 AlNiCo8HE
LNGT48B 8.5 850 1650 132 48 6.0
LNGT60 9.0 900 1380 110 60 7.5 AlNiCo60/11 / /
LNGT72 10.5 1050 1410 112 72 9.0 AlNiCo9 / / /
LNGT80 10.8 1080 1540 123 80 10.0
LNGT88 11.0 1100 1575 126 88 11.0
LNGT92 11.5 1150 1575 126 92 11.5
LNGT36J 7.0 700 1750 140 36 4.5 AlNiCo8HC AlNiCo36/15 / /
LNGT40J 7.2 720 1900 152 40 5.0
LNGT44J 8.2 820 1800 144 44 5.5 AlNiCo44/15 / /


Sintered AlNiCo magnet properties – USA standard (MMPA)
Grade Residual Induction
Br.
Coercive Force
Hcb.
Intrinsic Coercive Force
Hcj.
Max. Energy Product BH. Density % change Per C Tw Max Remark
kGs mT Oe kA/m Oe kA/m KJ/m3 MGOe g/cm3 %K
AlNiCo2 7.1 710 550 44 570 45 11.9 1.5 6.9 -0.02 450 Isotropic
AlNiCo5 10.9 1090 620 49 630 50 31.0 3.9 7.3 +0.01 525 Anisotropic
AlNiCo6 9.4 940 790 63 820 65 23.1 2.9 7.3 +0.03 525
AlNiCo8 7.4 740 1500 119 1690 134 31.8 4.0 7.3 +0.01 550
AlNiCo8HC 6.7 670 1800 143 2020 161 35.8 4.5 7.3 +0.01 550


Sintered Alnico - Typical Magnetic Performance Range, other standard
Grade Residual Induction
Br.
Coercive Force
Hcb.
Intrinsic Coercive Force
Hcj.
Max. Energy Product BH. Density Remark
kGs mT kA/m Oe kA/m Oe KJ/m3 MGOe g/cm3
FLN8 5.2 520 40 500 43 540 8-10 1-1.25 6.8 Isotropic
FLNG12 7.0 700 40 500 43 540 12-14 1.5-1.75 6.9
FLNG14 5.7 570 76 950 78 980 14-16 1.75-2.0 6.9
FLNG18 5.6 560 88 1100 90 1130 18-22 2.25-2.75 7.0
FLNG28 10.5 1050 46 580 47 590 28-33 3.5-4.15 7.3 Anisotropic
FLNG34 11.0 1100 48 600 50 630 33-38 4.1-4.7 7.3
FLNG35 12.2 1220 50 630 51 640 35-39 4.4-4.9 7.3
FLNGT28 10.0 1000 56 700 57 710 28-30 3.5-3.8 7.3
FLNGT31 7.8 780 104 1300 106 1130 33-36 3.9-4.5 7.3
FLNGT38 8.0 800 123 1550 126 1580 38-42 4.75-5.3 7.3
FLNGT42 8.8 880 120 1500 122 1530 42-44 5.3-5.5 7.3
FLNGT44 9.0 900 120 1500 125 1560 44-48 5.5-6.0 7.3
FLNG33J 6.5 650 136 1700 150 1880 31-36 4.1-4.5 7.3
FLNGT40J 8.0 800 1440 1800 155 1950 40-44 5.0-5.5 7.3
FLNGT44J 8.2 820 1520 1900 160 2000 44-48 5.5-6.0 7.3

More about Alnico Magnets

Alnico magnets, composed of primarily aluminum, nickel, and cobalt, were developed in the 1940's. This class of magnet remains a preferred material because of it's excellent temperature stability, high magnetic flux density, and resistance to corrosion. Alnico magnets are manufactured through a casting or sintering process. The casting process allows for the magnet to be manufactured into intricate and complex shapes, which are not possible with other magnetic materials.

Excellent temperature stability, high residual induction, and relatively high energies characterize Alnico materials, composed primarily of alloys of Aluminum, Nickel, and Cobalt. They are manufactured through either a casting or sintering process. Cast magnets may be manufactured in complex shapes, such as horseshoes, not possible with other magnet materials. Sintered Alnico offer slightly lower magnetic properties but better mechanical characteristics than cast Alnico. Cast Alnico 5 is the most commonly used of all the cast Alnico magnets. This material is used extensively in rotating machinery, meters, instruments, sensing devices, and holding applications, to name a few.

Alnico is hard and brittle. cannot be Machined or drilled. therefore be accomplished by ordinary methods. Holes are usually cored in at the foundry, and magnets are cast close to final size and then finish grinded to close tolerances.

Alnico has a low coercive force, and is easily demagnetized if not handled with care. For optimum performance of Alnico 5, the magnetic length should be approximately 5 times the pole diameter or equivalent diameter. For example, a 0.250" diameter magnet should be about 1.00" long.

Because of its higher coercivity, Alnico 8 may be used in shorter lengths and in disc shapes.