Cast AlNiCo Magnet

The Cast alnico magnet is made through melting an alloy of aluminum, nickel and cobalt at very high temperatures (1400-1500 degrees Celsius) to form liquid alnico which is then poured into the mounds under very high pressure (500-1000 tons per square centimeter). When it has cooled down enough, the resulting block of cast alnico can be drilled, sawed, ground or turned-on lathes depending on specific requirements. Cast AlNiCo magnet often requires heat treatment to further raise their coercivity performance. The Cast AlNiCo magnet is divided into isotropic form and anisotropic form depending on the applying direction of the magnetic field to orient magnets after heat treatment; it can be classified as isotropic material if they do not apply magnetic field during cooling process; instead, it will become anisotropic material if they apply magnetic field during cooling process.

Cast AlNiCo magnets can be used in many applications including motors, instruments, loudspeakers, etc. Different Cast AlNiCo Magnet structures are required according to customer’s special drawing or specification. Cast AlNiCo plays an important part in modern industry due to their excellent magnetic properties, high strength and hardness. Cast AlNiCo magnet is often manufactured by conventional foundry processes using conventional foundry equipment at 2100℃.

Cast AlNiCo Magnet can be processed into different sizes and shapes, with better machinability and strong plasticity; among the permanent magnet materials, cast AlNiCo magnets have the lowest reversible temperature coefficient, and the working temperature can be as high as 500 degrees Celsius. The majority part of AlNiCo magnets is cast type. The most common Alnico cast magnets are in grades 2, 3, 4, 5, 6, 8, and 9. They maintain approximately 85% of their room-temperature strength up to 550℃. They become completely demagnetized at approximately 850℃. For best results with Alnico 5 magnets, the length should be no less than 5 times the cross-section diameter or the diameter of a circle equal in area to the cross-section.

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Magneitc Properties of Cast ALnico Magnet

Grade RemanenceBr CoercivityHcb
Hcb
Max. Energy Product
(BH)max
Curie Temp. Max. Operating Temperature MMPA Equivalent
mT Gs kA/m Oe kJ/m3 MGOe
LN10 600 6000 40 500 10 1.2 750 550 AlNiCo3
LNG12 700 7000 44 550 12 1.5 750 550 AlNiCo2
LNG13 680 6800 48 600 13 1.63 800~850 550
LNG18 900 9000 48 600 18 2.25 800~850 550 AlNiCo4
LNG37 1200 12000 48 600 37 4.63 800~850 550 AlNiCo5
LNG40 1250 12500 48 600 40 5 800~850 550
LNG44 1250 12500 52 650 44 5.5 800~850 550
LNG52 1300 13000 56 700 52 6.5 800~850 550 AlNiCo5DG
LNG56 1300 13000 58 720 56 7 800~850 550 ?
LNG60 1330 13300 60 750 60 7.5 800~850 550 AlNiCo5-7
LNGT18 580 5800 90 1130 18 2.25 800~850 550 AlNiCo7
LNGT28 1000 10000 56 700 28 3.5 800~850 550 AlNiCo6
LNGT30 1100 11000 56 700 30 3.75 800~850 550 AlNiCo6
LNGT32 800 8000 100 1250 32 4 800~850 550 AlNiCo8
LNGT38 800 8000 110 1380 38 4.75 800~850 550
LNGT44 850 8500 120 1500 44 5.5 800~850 550
LNGT48 900 9000 120 1500 48 6 800~850 550
LNGT60 950 9500 110 1380 60 7.5 800~850 550
LNGT72 1050 10500 112 1500 72 9 800~850 550 AlNiCo9
LNGT88 1100 11000 115 1450 88 11 800~850 550
LNGT96 1150 11500 118 1480 96 12 800~850 550
LNGT36J 700 7000 140 1750 36 4.5 800~850 550 AlNiCo8HC
LNGT48J 800 8000 145 1820 48 6 800~850 550 AlNiCo8HC
LNGT52J 850 8500 140 1750 52 6.5 800~850 550 AlNiCo8HC