1. Introduce
– Alnico alloy magnets are a family of Fe alloys, mainly composed of Al, Ni, and Co
– Typically limited to a maximum service temperature of about 538℃, ideal for corrosive and high temperature applications
: Excellent magnetism, corrosion resistance, heat resistance, durability
| Element | Impact |
|---|---|
| Fe, Co, Ni | Ferromagnetic |
[Alnico2 Chemical Composition (%)]
| Ni | Al | Cu | Co | Fe |
|---|---|---|---|---|
| 18.0 | 10.0 | 6.0 | 13.0 | Bal. |
[Alnico2 Properties(Mechanical, Physical)]
| Tensile Strength (1000psi) | Specific Gravity (g/㎤) | Curie Temperature (℃) | Electrical resistivity (ohms/cir mil ft) | Hardness, Brinell or Rockwell |
|---|---|---|---|---|
| 3 (Cast Annealed) 65 (Sintered) | 7.09 (Cast Annealed) 6.73 (Sintered) | 700~860 | 390 (25℃) 408 (25℃) | Rc45 (Cast Annealed) Rc43 (Sintered) |
* Alnico
– A family of Fe alloys, mainly composed of Al, Ni, and Co, hence the abbreviation Alnico
→ 8~12% Al, 15~26% Ni, 5~24% Co, 6% Cu, 1% Ti and the rest is iron
– It has ferromagnetic properties and has the highest Curie ionization of all magnetic materials
– Typically limited to a maximum service temperature of about 538°C and are ideal for corrosive and high heat applications
– Alnico alloys are classified by chemical composition and magnetic properties (the classification number itself is not directly related to the properties of the magnet
→ By changing the combination of metals, the magnetic properties of the magnet can be tailored to suit the needs of the application.
→ Alnico grades vary in Co content
→ Alnico ranges from 0 (Alnico 3) to 40% (Alnico 8)
→ Alnico 2 to 4 : magnetic properties are isotropic
→ Alnico 5, 6, 8, 9 : Produce high magnetic output in the specified direction
(orientation is achieved during heat treatment)
→ Alnico 5 : The most widely used grade, it transfers energy to magnetic circuits more economically than other Alnico grades
→ Alnico 8 : Excellent coercivity and energy per unit volume among Alnico grades
→ Alnico 9 : A premium grade between Alnico 5 and 8 that produces superior magnetic output in the desired magnetization direction in the molten state
→ Magnetic force : Alnico 3 < Alnico 2 < Alnico 5
– Alnico alloys can be cast or sintered
[Cast/Sintered Alnico Materials]
| Properties | Cast | Sintered |
|---|---|---|
| Magnetic(Energy range) (MGOe) | 4.25~10 | 4.45~5.5 |
| Operating temperature (°C) | 525 | 450 |
2. Application & Product
– Electronics, Electrical, Automotive
| Application | Product |
|---|---|
| Electronics | Instrumentation, Communications, Electronics, Magnetic Switches, Magnetic Sensors, Polarization Relays, Temperature and Pressure Controllers, Magnetic Separators, Lifting Magnets, Magnetic Chucks, Magnetic Sweepers, Holding and Lifting Magnets |
| Electrical | Electric motors, Microphones, Generators, Speakers |
| Automotive | Lighters, Odometers |
(1) Magnetic Switches / (2) Relays / (3) Electric Motors / (4) Lighters
Leave a Reply
You must be logged in to post a comment.