Introduction

Alnico are precipitation hardened alloys requiring special heat treatment techniques.The raw materials used are Cobalt, Nickel, Copper, Aluminum and Iron. Titanium, silicon,etc. are added in certain proportions.The raw materials in their purest form are melted in medium frequency induction furnaces and castings are made using conventional sand or shell mould.The heat treatment consists of heating the alloy in furnace to well above its curie-point, and holding it at that temperature for some time. This is followed by controlled cooling after which the castings are reheated and held for a long period at a temperature of about 600ᵒC. This ageing process increases the coercive force and the energy product. Finally, the castings are ground to obtain close dimensional tolerances whenever necessary and inspected for physical and magnetic accuracy.

Alnico Magnet-1    Alnico-magnet-2    Alnico-magnet-3    Alnico-magnet-4    Alnico-magnet-5    Alnico-magnet-6    Alnico-magnet-7    Alnico-magnet-8    Alnico-magnet-9    Alnico-magnet-10

PML range of manufacturing includes all the below grades of AlNiCo.

PML also specializes in manufacturing isotropic magnets. These types of magnets have the unique property of exhibiting Multiple Poles.

Cast Alnico Materials - Physical and Mechanical Properties (Nominal values)

Cast Alnico Materials - Physical and Mechanical Properties (Nominal values)
Materials / Alloy Density g/cm3 Hardness Rockwell C (HRC) Curie Point °C Coefficient of thermal expansion 10-6/ °C Electrical resistivity @ 25 °C Ohm-cm x 10-6 Specific Heat Cal/gm/ °C
Alni 7 51 760 12 65 0.11
Coalni 7.2 52 700 12 62 0.11
Alnico 2 7.3 53 810 12 60 0.11
Coercimax 7.35 50 870 11.3 50 0.11
Coercimax Spl 7.35 50 870 11.3 50 0.11
Coalnimax Spl (Equivalent LNG 44) 7.35 50 870 11.3 50 0.11
Alnico5 DG 7.35 50 870 11.3 50 0.11

Cast Alnico Materials - Magnetic Properties (Nominal values)

Cast Alnico Materials - Magnetic Properties (Nominal values)
Materials / Alloy Remanence Br Gauss Coercivity Hc Oersted Maximum energy product (BH) max MGOe Working Point: Induction at max energy product Average Recoil Permeability G/Oe Minimum Magnetizing force Hs oersted Reversible Temp Coefficient of B, %/0C
ISOTROPIC
Alni 5600 - 6700 510 - 560 1.1 - 1.5 4400 4.3 3000 -0.03
Coalni 6000 - 6500 580 - 630 1.3 - 1.5 4400 4.5 3000 -0.03
Alnico 2 6700 - 7500 600 - 670 1.5 - 1.8 4400 4.9 3000 -0.03
ANISOTROPIC
Coercimax 11100 - 11900 690 - 730 4.3 - 5.1 8400 4 3000 -0.02
Coercimax Spl 11700 - 12300 630 - 690 5.0 - 5.8 10000 3.7 3000 -0.02
Coalnimax Spl (Equivalent to LNG 44) 12500 - 13000 650 - 700 5.5 - 6.0 10500 3 3000 -0.02
Alnico5 DG 13000 - 13500 650 - 750 6.0 - 6.5 11000 2.7 3000 -0.02

Excellent temperature stability, high residual induction, and relatively high energies characterize AlNiCo material. They can be manufactured in a number of complex shapes such as horseshoes.



Applications and dimensions of various typical cast Magnets - Alnico


1. Chuck Magnet

Chuck magnet Chuck magnet Drawing
Sr.No. A B C D
1 49 47 14 11
2 61 61 11 19
3 72 72 16 11
4 59 59 9 15
5 59 59 10 20

2. Drain Plug Magnets

Drain Plug Magnets Drain Plug Magnets Drawing
Sr.No. A B
1 7 5
2 12 10
3 12 8
4 7 9
5 10 8

3. Relay Magnets

Relay Magnets Relay Magnets Drawing
Sr.No. A B C
1 30.88 11.1 11.1
2 30.88 11.1 10.5
Relay Magnets Relay Magnets Drawing
Sr.No. A B C D
1 22.2 31.7 8.7 22
2 22.2 31.7 8.7 22.2
3 22.2 31.7 8.7 22.1
4 22.2 31.8 8.7 22.9
5 31.5 11.1 9.4 23

4. Speedometer and Sensor Magnets

Speedometer and sensor magnets product Speedometer and sensor magnets Drawing
Sr.No. A B C
1 23 13.5 3
2 25 6 5
3 23.3 13.5 2.8
4 25 6 3
5 23 6 3.5
6 25 6 3.7
7 30 6 3.5

5. Educational Magnets

Educational Magnets product Educational Magnets Drawing
Sr.No. A B C
1 75 15 10
2 60 15 10
3 50 15 5
4 50 10 15
Educational1 Magnets Product Educational1 Magnets Drawing
Sr.No. A B C D G
1 55 12.5 50 15 20

6. Measuring Instrument & Weighing Balance Magnets

Measuring instrument & weighing balance magnets product Measuring instrument & weighing balance magnets Drawing
Sr.No. A B C
1 42 22 14
2 40 24 -

7. Automobile Strainer Magnets

Automobile strainer magnets product Automobile strainer magnets Drawing
Sr.No. A B C
1 20 8.5 8
2 27.5 20 8

8. Rotor Magnets

Rotor Magnets product Rotor Magnets Drawing
Sr.No. A B C D
1 60.2 42 10 76.6