permanent magnet

AlNiCo Magnets

permanent magnet

AlNiCo Magnet

Aluminum Nickel Cobalt Magnet
AlNiCo magnets are sophisticated alloys primarily composed of aluminum, nickel, cobalt, copper, and iron. They come in two distinct forms: cast and sintered, each shaped by unique manufacturing processes. Cast AlNiCo magnets are known for their exceptional hardness and brittleness, which means that machining or drilling cannot be done using conventional methods. Typically, holes are created at the foundry during the casting process. Magnets are cast or sintered as close as possible to the desired size, effectively minimizing the need for abrasive grinding to achieve the specified dimensions and tolerances.

Magnetic Properties

Sintered AlNiCo Magnets
Grade Br Hcb (BH)max Tc Tw Code
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

The sintered AlNiCo magnet boasts slightly inferior magnetic properties, yet exhibits superior mechanical properties compared to cast AlNiCo materials. Particularly in smaller sizes, the sintered AlNiCo magnet emerges as the optimal choice. The sintering process also proves adept at large-scale production, resulting in parts that possess an enhanced structural strength compared to their cast counterparts. Precise tolerances can be achieved without the need for grinding.

Cast Alnico Magnets

Cast AlNiCo 5 is the most commonly used form of cast AlNiCo magnets. It exhibits superior magnetic properties, with a high energy product of 5 MGOe or more. As a result, it finds extensive application in a variety of rotating machinery, communication systems, meters and instruments, sensors, and holding mechanisms. AlNiCo 8, with its increased cobalt content of up to 35%, demonstrates enhanced resistance to demagnetization, making this particular material particularly effective in applications involving short lengths or length-to-diameter ratios of less than 2:1.

Temperature Characteristics

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Application

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Alnico permanent magnets are utilized across a variety of industries where magnetic stability and performance are critical. Notably, they serve as foundational materials in key sectors such as aerospace, defense, telecommunications, medical instruments, and electric motors, where demanding operating conditions require the exceptional magnetism and reliability provided by Alnico magnets.

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