Alnico1(Ni-Al-Co)

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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

[Alnico1 Chemical Composition (%)]

Ni	Al	Cu	Co	Fe
21.0	12.0	3.0	5.0	Bal.

[Alnico1 Properties(Mechanical, Physical)]

Tensile Strength (1000psi)	Specific Gravity (g/㎤)	Curie Temperature (℃)	Electrical resistivity (ohms/cir mil ft)	Hardness, Brinell or Rockwell
4 (Cast)	6.9	700~860	450 (25℃)	Rc45 (Cast)

* 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