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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 2000?F 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 Alnico 5 is the most commonly used of all the cast Alnicos. It combines high inductions with a high energy product of 5 MGOe or more and is used extensively in rotating machinery, communications, meters and instruments, sensing devices andholding 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.
Sintered Alnico materials offer slightly lower magnetic properties but better mechanical characteristics than the cast Alnico materials. Sintered Alnico magnets are most suitable in small sizes (less than 1 oz.). In this process, the desired mix of metal powders is pressed to shape and size in a die, then sintered at 2300?F in a hydrogen atmosphere. The sintering process is well suited to large volume production, and results in parts which are structurally stronger than cast magnets. Relatively close tolerances can be achieved without grinding.
TYPICAL MAGNETIC PERFORMANCE RANGE FOR CAST ALNICO MAGNET
| Grade | Br | Hcj | (BH)max | Density | Equivalent MMPA Class | %ChangePer C | Tc | Tw | ||||
| mT | KGs | KA/M | Oe | KJ/m3 | MGOe | G/cm3 | Near Br | Near Hcj | (0C) | (0C) | ||
| *LN9 | 680 | 6.8 | 30 | 380 | 9.0 | 1.13 | 6.9 | Alnico3 | -0.03 | -0.02 | 810 | 450 |
| *LN10 | 600 | 6.0 | 40 | 500 | 10.0 | 1.20 | 6.9 | |||||
| *LNG12 | 720 | 7.2 | 45 | 500 | 12.4 | 1.55 | 7.0 | Alnico 5 | -0.03 | -0.02 | 810 | 450 |
| *LNG13 | 700 | 7.0 | 48 | 600 | 12.8 | 1.60 | 7.0 | |||||
| LNG37 | 1200 | 12.0 | 48 | 600 | 37.0 | 4.65 | 7.3 | -0.02 | +0.02 | 860 | 525 | |
| LNG40 | 1250 | 12.5 | 48 | 600 | 40.0 | 5.00 | 7.3 | |||||
| LNG44 | 1250 | 12.5 | 52 | 650 | 44.0 | 5.50 | 7.3 | |||||
| LNG 52 | 1300 | 13.0 | 56 | 700 | 52.0 | 6.50 | 7.3 | Alnico 5DG | ||||
| LNG60 | 1350 | 13.5 | 59 | 740 | 60.0 | 7.5 | 7.3 | Alnico 5-7 | ||||
| LNGT28 | 1000 | 10.0 | 58 | 720 | 28.0 | 3.50 | 7.3 | Alnico 6 | -0.02 | +0.03 | 860 | 525 |
| LNGT36J | 700 | 7.0 | 140 | 1750 | 36.0 | 4.50 | 7.3 | Alnico 8HC | -0.025 | +0.02 | 860 | 550 |
| *LNGT18 | 580 | 5.8 | 100 | 1250 | 18.0 | 2.2 | 7.3 | Alnico 8 | -0.025 | +0.02 | 860 | 550 |
| LNGT32 | 800 | 8.0 | 100 | 1250 | 32.0 | 4.0 | 7.3 | -0.025 | +0.02 | 860 | 550 | |
| LNGT40 | 800 | 8.0 | 110 | 1380 | 40.0 | 5.0 | 7.3 | -0.025 | +0.02 | 860 | 550 | |
| LNGT60 | 900 | 9.0 | 110 | 1380 | 60.0 | 7.50 | 7.3 | Alnico 9 | -0.025 | +0.02 | 860 | 550 |
| LNGT72 | 1050 | 10.5 | 112 | 1400 | 72.0 | 9.00 | 7.3 | -0.025 | +0.02 | 860 | 550 | |
| Grade | Br | HcJ | HcB | (BH)max | Density | %Change Per C | Tc | Remark | ||||
| mT | KGs | KA/m | Oe | KA/m | Oe | KJ/m3 | MGOe | G/cm3 | %K | OC | ||
| FLN8 | 520 | 5.2 | 43 | 540 | 40 | 500 | 8-10 | 1.0-1.25 | 6.8 | -0.022 | 760 | Isotropic |
| FLNG12 | 700 | 7.0 | 43 | 540 | 40 | 500 | 12-14 | 1.5-1.75 | 7.0 | -0.014 | 810 | |
| FLNG14 | 570 | 5.7 | 78 | 980 | 76 | 950 | 14-16 | 1.75-2.0 | 7.1 | -0.020 | 850 | |
| FLNG18 | 560 | 5.6 | 90 | 1130 | 88 | 1100 | 18-22 | 2.25-2.75 | 7.2 | -0.020 | 850 | |
| FLNG28 | 1050 | 10.5 | 47 | 590 | 46 | 580 | 28-33 | 3.5-4.15 | 7.2 | -0.016 | 850 | Anisotropic |
| FLNG34 | 1100 | 11.0 | 51 | 640 | 50 | 630 | 34-38 | 4.3-4.8 | 7.2 | -0.016 | 890 | |
| FLNGT28 | 1000 | 10.0 | 57 | 710 | 56 | 700 | 28-30 | 3.5-3.8 | 7.2 | -0.020 | 850 | |
| FLNGT31 | 780 | 7.8 | 106 | 1130 | 104 | 1300 | 33-36 | 3.9-4.5 | 7.2 | -0.020 | 850 | |
| FLNG33J | 650 | 6.5 | 150 | 1880 | 136 | 1700 | 31-36 | 4.15-4.5 | 7.2 | -0.020 | 850 | |
| FLNGT38 | 800 | 8.0 | 126 | 1580 | 123 | 1550 | 38-42 | 4.75-5.3 | 7.2 | -0.020 | 850 | |
| FLNGT42 | 880 | 8.8 | 122 | 1530 | 120 | 1500 | 42-48 | 5.3-6.0 | 7.25 | -0.020 | 850 | |
TYPICAL APPLICATIONS FOR ALNICO MAGNET:
Widely used applications such as instruments and meters which require very stable temperature properties.
Electronic ignition systems,watt bour meters,volt-amp meters.medical instruments,industrial motors,magnetic reed switches,generators,hand tools,vending machines.
Small changes in magnetic properties to temperature effects Maximum working temperature can be as high as 450oC~550oC.
Low coercive force.
Strong corrosion resistance capability,no coating needed for surface protection.
