Alnico Magnets
AlNiCo Magnets Overview
AlNiCo magnetic material is an alloy of Aluminum-Nickel-Cobalt which possesses an excellent temperature stability and high residual induction. AlNiCo magnets have a low Coercive Force that limits their applications in many cases. Casting and sintering are two major processes used to manufacture the AlNiCo magnets.
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Performance of Sintered AlNiCo Magnets
| Grade | Br KGs (Mt) |
Hcj Oe (KA/m) |
Hcb Oe (KA/m) |
Bhmax MGOe (KJ/m3) |
D g/cm3 |
α %/°C | TC °C/°F |
|---|---|---|---|---|---|---|---|
| *FLN8 | 5.2(520) | 540 (43) | 500 (40) | 1.0-1.25 (8-10) | 6.8 | -0.022 | 760/1400 |
| *FLNG12 | 7.0(700) | 540 (43) | 500 (40) | 1.5-1.75 (12-14) | 7.0 | -0.014 | 810/1490 |
| *FLNGT14 | 5.7(570) | 980 (78) | 950 (76) | 1.75-2.0 (14-16) | 7.1 | -0.020 | 850/1562 |
| *FLNGT18 | 5.6(560) | 1130 (90) | 1100 (88) | 2.25-2.75 (18-22) | 7.2 | -0.020 | 850/1562 |
| FLNG28 | 10.5(1050) | 590 (47) | 580 (46) | 3.5-4.15 (28-33) | 7.2 | -0.016 | 850/1562 |
| FLNG34 | 11.0(1100) | 640 (51) | 630 (50) | 4.3-4.8 (34-38) | 7.2 | -0.016 | 890/1562 |
| FLNGT28 | 10.0(1000) | 710 (57) | 700 (56) | 3.5-3.8 28-30) | 7.2 | -0.020 | 850/1562 |
| FLNGT31 | 7.8(780) | 1130 (106) | 1300 (104) | 3.9-4.5 (33-36) | 7.2 | -0.020 | 850/1562 |
| FLNG33J | 6.5(650) | 1880 (150) | 1700 (136) | 4.15-4.5 (31-36) | 7.2 | -0.020 | 850/1562 |
| FLNGT38 | 8.0(800) | 1580 (126) | 1550 (123) | 4.75-5.3 (38-42) | 7.2 | -0.020 | 850/1562 |
| FLNGT42 | 8.8(880) | 1530 (122) | 1500 (120) | 5.3-6.0 (42-48) | 7.25 | -0.020 | 850/1562 |
| * = Isotropic, Others = Anisotropic | |||||||
Performance of Cast AlNiCo Magnets
| Grade | Br KGs (Mt) |
Hcj Oe (KA/m) |
Bhmax MGOe(KJ/m3) |
D g/cm3 |
MMPA Class |
α %/°C Br (Hcj) |
TC °C/°F |
Tmax °C/°F |
|---|---|---|---|---|---|---|---|---|
| *LN9 | 6.8(680) | 380 (30) | 1.13 (9.0) | 6.9 | Alnico3 | -0.02(+0.03) | 810/1490 | 450/842 |
| *LN10 | 6.0(600) | 500 (40) | 1.20 (10.0) | 6.9 | Alnico3 | -0.02(+0.03) | 810/1490 | 450/842 |
| *LNG12 | 7.2(720) | 500 (45) | 1.55 (12.4) | 7.0 | Alnico2 | -0.02(+0.03) | 810/1490 | 450/842 |
| *LNG13 | 7.0(700) | 600 (48) | 1.60 (12.8) | 7.0 | Alnico2 | -0.02(+0.03) | 810/1490 | 450/842 |
| LNG37 | 12.0(1200) | 600 (48) | 4.65 (37.0) | 7.3 | Alnico5 | -0.02(+0.03) | 860/1580 | 525/977 |
| LNG40 | 12.5(1250) | 600 (48) | 5.00 (40.0) | 7.3 | Alnico5 | -0.02(+0.03) | 860/1580 | 525/977 |
| LNG44 | 12.5(1250) | 650 (52) | 5.50 (44.0) | 7.3 | Alnico5 | -0.02(+0.03) | 860/1580 | 525/977 |
| LNG52 | 13.0(1300) | 700 (56) | 6.50 (52.0) | 7.3 | Alnico5DG | -0.02(+0.03) | 860/1580 | 525/977 |
| LNG60 | 13.5(1350) | 740 (59) | 7.50 (60.0) | 7.3 | Alnico5-7 | -0.02(+0.03) | 860/1580 | 525/977 |
| LNGT28 | 10.0(1000) | 720 (58) | 3.50 (28.0) | 7.3 | Alnico5 | -0.02(+0.03) | 860/1580 | 525/977 |
| LNGT36J | 7.0(700) | 1750 (140) | 4.50 (36.0) | 7.3 | Alnico8HC | -0.02(+0.03) | 860/1580 | 550/1022 |
| LNGT52J | 9.0(900) | 1750 (140) | 6.50 (52.0) | 7.3 | Alnico9HC | -0.02(+0.03) | 860/1580 | 550/1022 |
| *LNGT18 | 5.8(580) | 1250 (100) | 2.20 (18.0) | 7.3 | Alnico8 | -0.02(+0.03) | 860/1580 | 550/1022 |
| LNGT32 | 8.0(800) | 1250 (100) | 4.00 (32.0) | 7.3 | Alnico8 | -0.02(+0.03) | 860/1580 | 550/1022 |
| LNGT40 | 8.0(800) | 1380 (110) | 5.00 (40.0) | 7.3 | Alnico8 | -0.02(+0.03) | 860/1580 | 550/1022 |
| LNGT60 | 9.0(900) | 1380 (110) | 7.50 (60.0) | 7.3 | Alnico9 | -0.02(+0.03) | 860/1580 | 550/1022 |
| LNGT72 | 10.5(1050) | 1400 (112) | 9.00 (72.0) | 7.3 | Alnico9 | -0.02(+0.03) | 860/1580 | 550/1022 |
| LNGT88 | 11.0(1100) | 1500(120) | 11.00 (88.0) | 7.3 | Alnico9 | -0.02(+0.03) | 860/1580 | 550/1022 |
| * = Isotropic, Others = Anisotropic | ||||||||
Key Advantages
Sintered AlNiCo Magnets:
- Excellent temperature stability
- Strong corrosion resistance
- The maximum working temperature is up to 500°c
- Fine grain
- Compact crystal.
- Excellent magnetic consistence and evenness.
- Suitable for small volume and complex shape magnets.
Cast AlNiCo Magnets:
- Excellent temperature stability
- Strong corrosion resistance
- The maximum working temperature is up to 500°c
- Excellent capacity
- High density and magnetic properties
- Shorter production lead time
- Temperature factor of Br is the smallest among all the permanent magnets
- Cast AlNiCo magnets can be produced in relatively complex shapes
- Tooling for cast AlNiCo magnets is relatively low, since sand molds are generally used for the casting process.
Quick Leads
- Density - 7.34 g/cm3
- Manufacturing process - casting (most common), or sintering.
- Various shapes- blocks, bars, discs, rings, horseshoes, cylinders, etc.
- Wide range of grades- from about 0105 to 0519. (First 2 digits represent BH.max, and second two digits represent Intrinsic Coercivity, Hci.)
- Saturation magnetizing field required - about 5kOe.
Common Applications
Holding magnets Separators Sensors Security systems MRI Relays Magnetos