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Cast AlNiCo Magnet

Cast AlNiCo

Though it names AlNiCo, it is not an alloy containing Aluminum (Al), Nickel (Ni), Cobalt (Co). It also contains Cobalt, Nickel, and Aluminum with the addition of Iron, Copper, and sometimes Titanium that help make them become stronger permanent magnets. Max Working Temperature of AlNiCo ranges from 450°C to 550°C.There are two kinds of AlNiCo, Sintered AlNiCo and Cast AlNiCo. Cast magnets may be manufactured in complex shapes and the mould charge (sand mould) is cheap. But due to the sand mould edges, cast alnico has darkened edges with a slightly rough texture. To get smooth surface, grounding is needed. Sintered AlNiCo offer slightly lower magnetic properties but better mechanical characteristics. Most AlNiCo magnet grades are anisotropic (they can only be magnetized in a single axis /direction – they are the more powerful magnet grades of AlNiCo. The others are isotropic (they can be magnetized in any direction or directions) – they are weaker but offer more design and performance flexibility.

Magnetic and Physical Properties of Cast Alnico Magnet
GradesEquivalent MMPA
Class 
RemanenceCoercive ForceMaximum Energy ProductDensityReversible Temp. CoefficientReversible Temp. CoefficientCurie Temp.Temp. CoefficientRemark
Br Hcb(BH)maxg/cm3α(Br)α(Hcj)TCTW
mTGsKA/mOeKJ/m3MGOe%/℃%/℃
LN10ALNICO 3600600040500101.26.9-0.03-0.02810450Isotropy
LNG13ALNICO 270070004860012.81.67.2-0.03+0.02810450
LNGT18ALNICO 8 58058001001250182.27.3-0.025+0.02860550
LNG37ALNICO 512001200048600374.657.3-0.02+0.02850525Anisotropy
LNG40125012500486004057.3
LNG4412501250052650445.57.3
LNG52ALNICO 5DG13001300056700526.57.3
LNG60ALNICO5-713501350059740607.57.3
LNGT28ALNICO 610001000057.6720283.57.3-0.02+0.03850525
LNGT36JALNICO 8HC70070001401750364.57.3-0.025+0.02860550
LNGT38ALNICO 880080001101380384.757.3-0.025+0.02860550
LNGT40820820011013804057.3-0.025860550
LNGT60ALNICO 990090001101380607.57.3-0.025+0.02860550
LNGT7210501050011214007297.3 -0.025860550
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