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Alnico Magnets

Alnico magnets are made primarily from aluminium, nickel, cobalt, copper, iron and sometimes titanium. They can be either cast or sintered.

Sintered Alnico

Sintered alnico is made from a powdered mixture of ingredients that are pressed into a die under tons of pressure, sintered in a hydrogen atmosphere and then cooled either within a magnetic field or without (anisotropic Vs Isotropic).

Cast Alnico

Cast Alnico melted and poured into a mold. Once solidified, the material is rough ground and then heat-treated and cooled, sometimes in a magnetic field. When treated in the presence of a magnetic field, the magnet is called anisotropic. This orients the material to take on maximum magnetization and allows a higher gauss level. A cast magnet that is not heat-treated in a magnetic field is called Isotropic. After heat treatment and cooling, the material can be ground to specific tolerances and then magnetized.


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Attributes of both Cast and Sintered Alnico :
  • Very temperature stable great for high heat applications
  • Maximum working temperature 525oC - 550oC
  • May be ground to size
  • Does not lend itself to conventional machining (Hard and Brittle)
  • High residual induction and energy product compared to Ferrite material
  • Low coercive force compared to Ferrite and rae earth materials (more subject to demagnetization)
  • Most common grades of Alnico are 5 and 8
Applications of Alnico Magnets :
Magnetizing and Handling

Magnetizing is done after the magnet has been machined to the correct tolerances. Care should be taken when handling alnico material since it is brittle and chip or break if dropped on a hard surface. Also, because it has a low resistance to demagnetization, it will lose power if it is stored improperly (poles repelling each other). For best results, store magnetized alnico so that pieces are attracting each other, or with a steel keeper.

Magnetos, Separators, sensors, electron tubes, traveling wave tubes, radar, holding magnets, coin acceptors, clutches and bearings, motors, distributors, relays, controls, generators, receivers, telephones, microphones, bell ringers, guitar pickups, loudspeakers, security systems, cow magnets.

Typical magnetic and Physical Properties of Alnico Magnet Material :
Anisotropic Alnico Density Maximun Energy Product BH(max) Residual Imduction BR Coercive Force Hc Intrinsic Coercive Force Hci Maximum Operating Temperature Curie Temperature
g/cm3 MGO Gauss Oersteds Oersteds Co Co
Alnico 5(Cast) 7.3 5.5 12800 640 640 525 860
Alnico 8(Cast) 7.3 5.3 8200 1650 1890 550 860
Alnico 5(Sintered) 6.9 3.9 10900 620 630 525 860
Alnico 5(Sintered) 7.0 4.0 7400 7500 1690 550 860
Technical data of sintered AlNiCo permanent Magnets :
Grade (BH)max Br Hcj HCb D g/cm³ αBr%/K Tc°C Remark
KJ/cm³ MGOe mT Gs kA/m Oe kA/m Oe
FLN8 8-10 1.0-1.25 520 5200 43 540 40 500 6.7 -0.020 760 Isotropic
FLNG12 12-14 1.5-1.75 700 7000 43 540 40 500 7.0 -0.014 810
FLNGT14 14-16 1.75-2.0 570 5700 78 950 76 950 7.1 -0.020 850
FLNGT18 18-22 2.25-2.75 600 6000 107 1350 95 1200 7.2 -0.020 850
FLNG28 28-33 3.5-4.15 1050 10500 47 590 46 580 7.2 -0.016 850 Anisotropic
FLNG34 34-38 4.3-4.8 1100 11000 51 640 50 630 7.2 -0.016 890
FLNGT28 28-30 3.5-3.8 1000 10000 57 710 56 700 7.2 -0.020 850
FLNG38J 38-40 4.75-5.0 730 7300 163 2050 151 1900 7.2 -0.200 850
FLNGT38 38-42 4.75-5.3 800 8000 126 1580 123 1550 7.2 -0.020 850
FLNGT42 42-48 5.3-6.0 800 8800 122 1530 120 1550 7.25 -0.020 850
NOTE:
  • The above-mentioned data of magnetic parameters and physical properties are in room temperature.
  • The maximum working temperature of magnet is changeable due to ratio length and diameter and environmental factors.
Technical data of cast AlNiCo permanent Magnets :
Grade Equivalent MMPA Class (BH)max Br Hcj D g/cm³ αBr%/K Tc°C Tw°C Remark
    KJ/cm³ MGOe mT Gs kA/m Oe          
LN9 AlNiCo1 9.0 1.13 680 6800 30 380 6.9 -0.03 760 450 Isotropic
LN10 10.0 1.20 600 6000 40 500 6.9 -0.03 760 450
LNG12 AlNiCo2 12.4 1.55 720 7200 45 500 7.0 -0.03 810 450
LNG13 13.0 1.60 700 7000 48 600 7.0
LNG34 AlNiCo5 34.0 4.30 1200 12000 48 600 7.3 -0.02 860 525 Anisotropic
LNG37 37.0 4.65 1200 12000 48 600 7.3
LNG40 AlNiCo5DG 40.0 5.00 1250 12500 48 600 7.3
LNG44 44.0 5.50 1250 12500 52 650 7.3
LNG52 AlNiCo5-7 52.0 6.50 1300 13000 56 700 7.3
LNGT28 AlNiCo6 28.0 3.50 1000 10000 58 720 7.3 -0.025 860 550
LNGT36J AlNiCo8H 36.0 4.50 700 7000 140 1750 7.3 -0.025 860 550
LNGT32 AlNiCo8 32.0 4.00 800 8000 100 1250 7.3 -0.025 860 550
LNGT40 40.0 5.00 800 8000 110 1380 7.3
LNGT60 AlNiCo9 60.0 7.50 900 9000 110 1380 7.3 -0.025 860 550
LNGT72   72.0 9.00 1050 10500 112 1400 7.3

NOTE:
  • The above-mentioned data of magnetic parameters and physical properties are in room temperature.
  • The maximum working temperature of magnet is changeable due to ratio length and diameter and environmental factors.
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