Alnico Magnets

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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.

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

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

Sr.No.	A	B
1	7	5
2	12	10
3	12	8
4	7	9
5	10	8

3. Relay Magnets

Sr.No.	A	B	C
1	30.88	11.1	11.1
2	30.88	11.1	10.5

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

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

Sr.No.	A	B	C
1	75	15	10
2	60	15	10
3	50	15	5
4	50	10	15

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

Sr.No.	A	B	C
1	20	8.5	8
2	27.5	20	8

8. Rotor Magnets

Sr.No.	A	B	C	D
1	60.2	42	10	76.6