Sintered AlNiCo magnet is manufactured by traditional powder metallurgy technology which basically same as other sintered permanent magnets. The overall magnetic properties of sintered AlNiCo magnet are slightly lower than cast AlNiCo magnets, thus not so frequently used like the latter. Sintered AlNiCo magnets are well adapted for small-sized (less than 28 grams), thin, light, and special shaped magnets. In addition to high dimensional accuracy, tight tolerance, and without further machining steps, sintered AlNiCo magnet also exhibit slightly mechanical strength and machinability. Viewing from the large volume production, sintered AlNiCo magnet has higher material utilization ratio, lower composition segregation, and magnetic performance fluctuation in comparison with cast AlNiCo magnet.
Manufacturing Process of Sintered AlNiCo Magnet
Magnetic Properties of Sintered AlNiCo Magnet
| Grade | Remanence Br | Coercivity Hcb | Max. Energy Product (BH)max | Temperature Coefficient ％/℃ | Curie Temperature | Max. Operating Temperature | MMPA Standard | ||||
| mT | Gs | kA/m | Oe | kJ/m3 | MGOe | Br | Hcj | ℃ | ℃ | ||
| FLN8 | 500 | 5000 | 40 | 500 | 9 | 1.13 | -0.02 | -0.03 | 760 | 450 | AlNiCo3 |
| FLNG12 | 700 | 7000 | 48 | 600 | 12 | 1.55 | -0.02 | -0.03 | 810 | 450 | AlNiCo2 |
| FLNG18 | 600 | 6000 | 90 | 1130 | 18 | 2.20 | -0.02 | -0.03 | 860 | 450 | AlNiCo7 |
| FLNG34 | 1200 | 12000 | 48 | 600 | 34 | 4.25 | -0.02 | -0.03 | 890 | 450 | AlNiCo5 |
| FLNG37 | 1250 | 12500 | 48 | 600 | 37 | 4.63 | -0.02 | -0.03 | 890 | 450 | |
| FLNGT28 | 1050 | 10500 | 60 | 600 | 28 | 3.50 | -0.02 | -0.03 | 850 | 450 | AlNiCo6 |
| FLNGT38 | 800 | 8000 | 120 | 1500 | 38 | 4.75 | -0.02 | -0.03 | 850 | 450 | AlNiCo8 |
| FLNGT42 | 880 | 8800 | 120 | 1500 | 42 | 5.25 | -0.02 | -0.03 | 820 | 450 | |
| FLNGT36J | 700 | 7000 | 140 | 1750 | 33 | 4.13 | -0.02 | -0.03 | 850 | 450 | AlNiCo8HC |
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