Position: Fecrco > product > Cast AlNiCo

Cast AlNiCo

Cast AlNiCoAlnico magnets can be made into many shapes and sizes during manufacturing process by using the casting processing method. Cast Alnico magnets are manufactured by pouring the molten metal alloy of Alnico into a mold and then further processing it through heat treated and cooled alternatively. The solidified material has a dark gray appearance on the exterior and may be roughly ground. Magnets that have been polished using machines, may have a shiny gray surface similar to that of steel.

Cast AlNiCoSometimes the material is treated in the presence of a magnetic field. This results in the material taking on maximum magnetization and allows a higher gauss level. Such magnets are called anisotropic magnets. A cast magnet that is not treated in a magnetized field is called isotropic magnet. After heating and cooling treatments the material can then be ground to specific tolerances and magnetized.

Specialized casting techniques are used to achieve the unique crystalline grain orientation found in the Alnico 5 and 8 grades. These anisotropic grades are designed to produce high magnetic output in a specified direction. Orientation is achieved during heat treatment, by cooling the casting from 2000F at a controlled rate within a magnetic field which conforms to the preferred direction of magnetization. Alnico 5 and Alnico 8 are anisotropic and exhibit a preferred direction of orientation, magnetic orientation should be specified on your drawing when you send an order to us.

Cast AlNiCoCast Alnico 5 is the most commonly used of all the cast Alnico magnets. It combines high indications with a high energy product of 5 MGOe or more and is used extensively in rotation machinery, communications, meters and instruments, sensing devices and holding applications. The higher resistance to demagnetization (coercive force) of Alnico 8, cobalt content to 35%, allows this material to function well for short lengths or for length to diameter ratios of less than 2 to 1.

(1) Characteristics and Typical Applications

Cast AlNiCo is suitable for the application of precision instruments, advanced electrical meters; water meters, mobile odometers, eletricity motor switch, sensors, electroacooustic and telecommunication devices, spinning topes and microwave devices.

Cast AlNiCo is characterized by high flux density and superior temperature stability, and offers the excellent temperature characteristics of any standard production magnet material available. Owing to the cast process, it is economical and suitable for the manufacture of magnet of relatively large size.

Raw materialForming Smelting Heat treatment Final inspection

Packing Magnetizing Surface treatmentStocking

Typical Magnetic Performance Range for Cast Alnico Magnet

Grade Br Hc (BH)max MMPA Equivalent Temp. Coefficient
a(Br)
Tc Tw
mT KGs KA/M Oe KJ/m3 MGOe %/℃
LN9 690 6.9 37 470 10.0 1.25 Alnico 1 -0.03 760 500
LNG12 700 7 40 500 12.0 1.50 Alnico 2 -0.03 810 500
*LNG13 680 6.8 48 600 12.0 1.50 Alnico 2 -0.03 810 500
*LN10 600 6 40 500 10 1.2 Alnico 3 -0.03 760 500
LNGT18 580 5.8 90 1130 18.0 2.20 [l. Alnico 7] -0.03 860 500
LNG16 800 8 53 660 16.0 2.00 Alnico 4 -0.02 850 500
LNG34 1180 11.8 44 550 35.0 4.30 Alnico 5C -0.02 890 500
LNG37 1180 11.8 48 600 37.0 4.65 Alnico 5 -0.02 890 500
LNG40 1220 12.2 48 600 40.0 5.00 -0.02 890 500
LNG44 1220 12.2 52 650 44.0 5.50 Alnico 5 DG -0.02 890 500
LNG 52 1250 12.5 55 690 52.0 6.50 Alnico 5-7 -0.02 890 550
LNG60 1300 13 56 700 60.0 7.50 Alnico 6 -0.02 890 500
LNGT28 1050 10.50 56 700 28.0 3.50 Alnico 8 -0.02 860 550
LNGT32 800 8 104 1300 34 4.25 -0.03 860 550
LNGT38 820 8.2 110 1380 38.0 4.75 -0.03 860 550
LNGT44 880 8.8 120 1500 44.0 5.50 -0.03 860 550
LNGT60 900 9 110 1380 60 7.5 Alnico 9 -0.03 860 550
LNGT72 1050 10.5 112 1410 72 9   -0.03 860 550
LNGT36J 700 7 140 1750 36 4.5 Alnico 8HC -0.03 860 550

Demagnetization Curve of Cast Alnico

Cast Alnico Demagnetization Curve