Home About Us Products Custom Magnets Honners FAQ Packing Details Contact Us
Neodymium Magnets
adhesive magnets
SmCo Rare Earth Magnets
 Alnico Magnets
Ceramic Magnets
Flexible Plastic Magnets
Magnetic assembly
 Magnetic Sheet Metal Lifter
 Magnetic Cather
 magnetic attractor
 magnetic lifter
 Ferrite POT
 magnetic sweepers
 MANETIC POT
 
 

Aluminium Nickel Cobalt(AlNiCo) Alloys

   AlNiCo magnets are the oldest permanent mangets, including Aluminium,Nickel、Cobalt、Ferrum and other Micro metal elements. According to different technology, AlNiCo magnet can be divided into Sintered AlNiCo and Cast AlNiCo. The shapes of AlNiCo magnet are mainly round and rectangle. Foundry technique can realize different shapes .Comparing with foundry technique, Cast AlNiCo is limited to small specifications.Among different permanent materials, Cast AlNiCo is with the lowest reversible temperature coefficient and its max. working temperature can be up to 600 Celsius degree. AlNiCo magnets are widely used in various instruments and meters and other fields.Excellent temperature stability, high residual induction, and relatively high energies characterize Alnico materials, composed primarily of alloys of Aluminum, Nickel, and Cobalt. They are manufactured through either a casting or sintering process. Cast magnets may be manufactured in complex shapes, such as horseshoes, not possible with other magnet materials. Sintered Alnicos offer slightly lower magnetic properties but better mechanical characteristics than cast Alnicos. Cast Alnico 5 is the most commonly used of all the cast Alnicos. This material is used extensively in rotating machinery, meters, instruments, sensing devices, and holding applications, to name a few.
Performance of Cast Alnico Magnets
  Remanence Coercivity Force Maximun Energy Temp. Coefficient of Br Temp. Coefficient of Hcj
Material Br Hcb (BH)max 系数α(Br) 系数α(Hcj)
Grade mT kA/m kJ/m3 %K %K
  Gs Oe MGOe
LN10 600/6000 40/500 10.00/1.20 -0.02 0.03
LNG12 700/7000 44/550 12.00/1.50 -0.02 0.03
LNG13 680/6800 48/600 13.00/1.63 -0.02 0.03
LNG18 900/9000 48/600 18.00/2.25 -0.02 0.03
LNG37 1200/12000 48/600 37.00/4.63 -0.02 0.03
LNG40 1250/12500 48/600 40.00/5.00 -0.02 0.03
LNG44 1250/12500 52/650 44.00/5.50 -0.02 0.03
LNG52 1300/13000 56/700 52.00/6.50 -0.02 0.03
LNG56 1300/13000 58/720 56.00/7.00 -0.02 0.03
LNG60 1330/13300 60/750 60.00/7.50 -0.02 0.03
LNGT18 580/5800 90/1130 18.00/2.25 -0.02 0.03
LNGT30 1100/11000 56/700 30.00/3.75 -0.02 0.03
LNGT32 800/8000 100/1250 32.00/4.00 -0.02 0.03
LNGT38 800/8000 110/1380 38.00/4.75 -0.02 0.03
LNGT44 850/8500 120/1500 44.00/5.50 -0.02 0.03
LNGT48 900/9000 120/1500 48.00/6.00 -0.02 0.03
LNGT60 950/9500 110/1380 60.00/7.50 -0.02 0.03
LNGT72 1050/10500 112/1400 72.00/9.00 -0.02 0.03
LNGT88 1100/11000 115/1450 88.00/11.00 -0.02 0.03
LNGT36J 700/7000 140/1750 36.00/4.50 -0.02 0.03
LNGT52J 900/9000 140/1750 52.00/6.50 -0.02 0.03

Note: Curie temperature, the temperature coefficient is only for reference, not as a judgement basis.

Sintering AlNiCo Magnet performance Table

  Remanence Coercivity Force Maximun Energy Curie Temp. Working Temp. Temp. Coefficient of Br
Material Br Hcj (BH)max Tc Tw aBr
Grade mT kA/m kJ/m3 %/℃
  Gs Oe MGOe
FLN8 500/5000 40/500 9/1.13 760 450 -0.022
FLNG12 700/7000 48/600 12.4/1.55 810 450 -0.014
FLNG34 1200/12000 48/600 34/4.25 890 450 -0.016
FLNG37 1250/12500 48/600 37/4.62 890 450 -0.016
FLNGT18 600/6000 90/1130 18/2.20 860 450 -0.02
FLNGT28 1050/10500 60/600 28/3.50 850 450 -0.02
FLNGT38 800/8000 120/1500 38/4.75 850 450 -0.02
FLNGT42 880/8800 120/1500 42/5.25 820 450 -0.02
FLNGT33J 700/7000 140/1750 33/4.13 850 450 -0.025

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.

Manufacturing Methods
Alnico magnets are manufactured through either casting or sintering processes.
Cast magnets are manufactured by pouring a molten metal alloy into a mold and then further processing it through various heat-treat cycles. The resulting magnet has a dark gray exterior appearance, and may have a rough surface. Machined surfaces have a shiny appearance similar to steel.
Sintered magnets are manufactured by compacting fine Alnico powder in a press, and then sintering the compacted powder into a solid magnet.

Assemblies
We are able to manufacture metal and other components of finished sub assemblies using our CNC machining facilities.
Assemblies can be fabricated by adhering magnets with adhesives to suit a range of environments, by mechanically fastening magnets, or by a combination of these methods. Due to the relatively brittle nature of these magnet materials, press fits are not recommended.

Surface Treatments
The corrosion resistance of Alnico is considered excellent , and no surface treatments are required. However, Alnico magnets are easily plated for cosmetic reasons if required.

Machining
Alnico is hard and brittle, and prone to chipping and cracking. Machining or drilling can not therefore be accomplished by ordinary methods. Holes are usually cored in at the foundry, and magnets are cast close to final size and then finish machined to closer tolerances.

Magnetizing and Handling
Alnico has a low coercive force, and is easily demagnetized if not handled with care. Because of their relatively low coercivities, special care should be taken to assure that these magnets are not subjected to adverse repelling fields, since these could partially demagnetize the magnets. Magnetized magnets should be stored with papers to reduce the possibility of partial demagnetization. If Alnicos are partially demagnetized, they may be easily remagnetized.

Temperature Effects
Up to about 1,000 F, changes in magnetization are largely reversible and re-magnetizable, while changes above this are largely structural and not fully reversible or re-magnetizable. Approximately 90% of room temperature magnetization is retained at temperatures of up to 1,000 F.

Address: No.559,Songjiang East road, Pan Yi industrial park, Yinzhou District, NINGBO CHINA 315104
Tel: (+86)-153-3660-5525 Fax: (+86)-574-8836-3696 (+86)-574-8812-6297 E-mail: info@diatoolmagnet.com
friendlinks:Neodymium Magnets|jaw crusher|Custom Magnets|super magnets |pandora silver charms|stone crusher|rare earth magnets