Strong Power Alnico 8 Bar Magnet
Alnico Magnet
These magnets are based mainly on iron (Fe), aluminum (Al), nickel
(Ni) and cobalt (Co). The magnets are fragile
and not ductile. Therefore, after the raw metal is melted at high
temperature and turned into an alloy, it is cast into a
casting mold. These magnets are therefore also known as cast
magnets.Al-Ni-Co magnets achieve high Br values and
high temperature stability, readily cause low-temperature
demagnetization and thermal demagnetization, achieve
high mechanical strength, and offer other advantages. However,
these magnets have low magnetic coercive force
and readily undergo demagnetization due to an external magnetic
field, are unsuited for thin products, and placed
under other constraints. In the design process, it is therefore
important to select a method of magnetization
that allows for sufficient shape and magnetic characteristics, and
a method of assembly in
which consideration is given to demagnetization.
Produced by casting or sintering powder metallurgical technique with alloy composite of Al-Ni-Fe-Co
Alnico is a very hard and brittle material and does not lend itself
to conventional machining.
UNMAG have experienced machinists and the proper equipment to grind
alnico to its required dimensions.
Characteristic of Both Cast and Sintered Alnico magnet
Very temperature stable, great for high heat applications
Maximum working temperature 450-550°C
Does not lend itself to conventional machining (hard and brittle)
High residual induction and energy product compared to ceramic
material
Low coercive force compared to ceramic and rare earth materials
(more subject to demagnetization)
Most common grades of alnico are 5 and 8
Not suited for repelling or high friction applications
| Magnetic Properties Of Alnico
Magnet | | | | | | | |
Grade |
Equivalent MMPA Class |
Remanence | Intrinsic
Coercivity |
Coercivity |
Maximum Energy Product | Density |
Reversible Temp. Coefficient |
Curie Temp. |
Temp.Coefficient |
Remark |
| | Br | Hcj | Hcb | (BH)max | g/cm3 | α(Br) | TC | TW | |
| | mT | Gs | KA/m | Oe | KA/m | Oe | KJ/m3 | MGOe | | %/℃ | ℃ | ℃ | |
| FLN8 | Alnico3 | 520 | 5200 | 43 | 540 | 40 | 500 | 8-10 | 1.0-1.25 | 6.8 | -0.02 | 760 | 450 |
Isotropic |
| FLNG12 | Alnico2 | 700 | 7000 | 43 | 540 | 40 | 500 | 12-14 | 1.5-1.75 | 7 | -0.014 | 810 | 450 |
| FLNGT18 | Alnico8 | 600 | 6000 | 107 | 1350 | 95 | 1200 | 18-22 | 2.25-2.75 | 7.2 | -0.02 | 850 | 550 |
| FLNGT28 | Alnico6 | 1000 | 10000 | 57 | 710 | 56 | 700 | 28-30 | 3.5-3.8 | 7.2 | -0.02 | 850 | 525 |
Anisotropic |
| FLNG34 | Alnico5 | 1100 | 11000 | 51 | 640 | 50 | 630 | 34-38 | 3.5-4.15 | 7.2 | -0.016 | 890 | 525 |
| FLNGT31 | Alnico8 | 780 | 7800 | 106 | 1130 | 104 | 1300 | 33-36 | 3.9-4.5 | 7.2 | -0.02 | 850 | 550 |
| FLNGT38 | 800 | 8000 | 126 | 1580 | 123 | 1550 | 38-42 | 4.75-5.3 | 7.2 | -0.02 | 850 | 550 |
| FLNGT42 | 880 | 8800 | 122 | 1530 | 120 | 1500 | 42-48 | 5.3-6.0 | 7.25 | -0.02 | 850 | 550 |
| FLNGT33J | Alnico8HC | 680 | 6800 | 151 | 1885 | 140 | 1750 | 33～36 | 4.1-4.5 | 7.2 | -0.02 | 850 | 550 |
| FLNGT40J | 800 | 8000 | 156 | 1950 | 144 | 1800 | 43~47 | 5.4~5.9 | 7.2 | -0.02 | 850 | 550 |
Physical Properties
Parameter Name | Value |
Cruie Temperature | 760 ~ 890℃ |
Max. Operatin Temperature | 450 ~ 550℃ |
Resistivity | 47 ~ 54 μ Ω.cm |
Hardness | 520 ~ 630 HV |
Density | 6.9 ~ 7.3 g/cm³ |
Relative Recoil Permeablility | 1.7 ~ 4.7 μrec |
Saturation Field Strength | 2.7 ~ 6.3 kOe / 215~500 kA/m |
Temperature Coefficient of Br | -0.025 ~ -0.02%/℃ |
Temperature Coefficient of iHc | +0.01 ~ +0.03 %/℃ |
Manufacturing Process
Mixing |
Melting |
Casting |
Coarse processing |
Heat treatment |
Finish processing |
Magnetization |
Applications of Alnico Magnets - Separators, sensors, electron
tubes, traveling wave tubes, radar, holding magnets,
coin acceptors, clutches and bearings, auto ignition magnetos,
motors, distributors, relays,,controls, generators,
receivers, telephones, bell ringers,microphones, guitar pickups,
loudspeakers, security systems, cow magnets.
Regarding of magnetic properties of Alnico Magnet, Please
click here.
For your different application,different grade/series for your
choice
