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Alnico Magnets

Alnico magnets are a group of permanent magnets composed mainly of aluminum (Al), nickel (Ni), and cobalt (Co), with iron (Fe) as a base metal. In addition to these primary elements, small amounts of other materials such as copper (Cu) and titanium (Ti) are often added to further enhance their magnetic properties. Alnico magnets stand out for their high temperature stability, maintaining approximately 85% of room-temperature magnetization up to 1,000°F. They offer strong residual induction, high energy products, and natural corrosion resistance, eliminating the need for surface treatments (though plating is an option). Alnico magnets can be manufactured through casting or sintering. While sintered alnico magnets are slightly less powerful than cast versions, they offer better mechanical properties. The sintering process is ideal for high-volume production, producing structurally stronger parts than cast magnets and achieving relatively close tolerances without the need for grinding.

 

∇ Highly resistant to extreme temperatures, with operating temps exceeding 1000°F
∇ Lower coercive strength, easily demagnetized
∇ Strong corrosion resistance: Less susceptible to oxidation than other magnets
∇ Available in both cast and sintered forms

 

Summary Of Main Grade Of AlNiCo Magnets

 

Grade Equivalent MPA Class Remanence Coercive Force Coercive Force Maximum Energy Product Density Reversible Temp Curie Temp Temp Coefficie Remark
Br Hcj Hcb (BH) max α (Br) TC TW
mT Gs kA/m Oe kA/m Oe kJ/m3 MGOe g/cm3 %/°C °C °C
SLN8 Alnico3 520 5200 43 540 40 500 8 -10 1.0 - 1.25 6.8 -0.02 730 450 Isotropy
SLNG12 Alnico2 700 7000 43 540 40 500 12 -14 1.5 - 1.75 7 -0.014 810 450
SLNGT18 Alnico8 600 6000 107 1350 95 1200 18 - 22 2.25 - 2.7 7.2 -0.02 850 550
SLNGT28 Alnico6 1000 10000 57 710 56 700 28 - 30 3.5 - 3.8 7.2 -0.02 850 525 Anisotropy
SLNG34 Alnico5 1100 11000 51 640 50 630 14 - 38 3.5 - 4.15 7.2 -0.016 890 525
SNGT31 Alnico8 780 7800 106 1130 104 1300 30 - 36 3.9 - 4.5 7.2 -0.02 850 550
SLNGT38 800 8000 126 1580 123 1550 38 - 42 4.75 - 5.3 7.2 -0.02 850 550
SLNGT42 880 8800 122 1530 120 1500 42 - 48 5.3 - 6.0 7.25 -0.02 850 550
SLNGT38J Alnico11 730 7300 151 2050 151 1900 38 - 40 4.75 - 5.0 7.2 -0.02 850 550

 

Grade Equivalent MPA Class Remanence Coercive Force Maximum Energy Product Density Reversible Temp Reversible Temp Curie Temp Temp Coefficie Remark
Br Hcb (BH) max α (Br) α (Hcj) TC TW
mT Gs kA/m Oe kJ/m3 MGOe g/cm3 %/°C %/°C °C °C
LNGT18 Alnico8 580 5800 100 1250 18 2.2 7.3 -0.025 +0.02 860 550  
LNG37 Alnico5 1200 12000 48 600 37 4.65 7.3 -0.02 +0.02 850 525 Anisotropy
LNG40 Alnico5 1250 12500 48 600 40 5 7.3 -0.02 +0.02 850 525
LNG44 Alnico5 1250 12500 52 650 44 5.5 7.3 -0.02 +0.02 850 525
LNG52 Alnico5DG 1300 13000 56 700 52 6.5 7.3 -0.02 +0.02 850 525
LNG60 Alnico5-7 1350 13500 59 740 60 7.5 7.3 -0.02 +0.02 850 525
LNGT28 Alnico6 1000 10000 57.6 720 28 3.5 7.3 -0.02 +0.03 850 525
LNGT36J Alnico8HC 700 7000 140 1750 36 4.5 7.3 -0.025 +0.02 850 550
LNGT38 Alnico8 800 8000 110 1380 38 4.75 7.3 -0.025 +0.02 860 550
LNGT40 820 8200 110 1280 40 5 7.3 -0.025 +0.02 850 550
LNGT60 Alnico9 900 9000 110 1380 60 7.5 7.3 -0.025 +0.02 860 550
LNGT72 1050 10500 112 1400 72 9 7.3 -0.025 +0.02 860 550
LNGT80 1080 10800 120 1500 80 10 7.3 -0.025 +0.02 860 550
LNGT88 1100 11000 115 1450 88 11 7.3 -0.025 +0.03 860 550
LNGT96 1150 11500 118 1480 96 12 7.3 -0.025 +0.02 860 550

 

 

Process Flow

Alnico Magnets

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