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Composition of AlNiCo
Alnico is an iron alloy, in addition to iron; it includes aluminum (Al 8-12%), nickel (Ni 15-26%), cobalt (Co 5-24%) and small amounts of other metals of other elements which can enhance magnetic force (Cu 6%; Ti 1%; the rest Fe). The name of "Alnico" is a merger of three main element symbols.
Category of AlNiCo
According to the different production processes, AlNiCo can be divided into Sintered Alnico and Cast Alnico.
The process of Sintered Alnico is simple, and can be pressed into the desired size. Usually it limited to small size and low magnetic properties. The tolerance of size of finished roughcast is stricter than cast AlNiCo's. But better machinability.
The casting process can made into different sizes and shapes; cast AlNiCo has the lowest reversible temperature coefficient, operating temperature is up to 500 degrees Celsius, the magnetic force is high.
The process of manufacturing of AlNiCo
Casting: raw material ----> melting ----> casting ----> heating ----> performance testing ----> machining ----> testing ----> Packaging
the metal alloy is melt by mold, and then processed by heat treatment into cast AlNiCo. Thus the appearance of cast AlNiCo is rough and dark gray. After grinding, the surface is similar like bright iron.
Sintering: raw material ----> milling ----> pressing ----> sintering ----> heating ----> performance testing ----> machining ----> testing - -> Packaging
Alnico powder is pressed in the container, and then sintered into a solid magnet.
Advantages and disadvantages of AlNiCo
Advantages: high remanence (up to 1.35T), high Curie Point (860 °), high quality, the highest temperature up to about 550 ℃, low temperature coefficient (-0.02% / ° C ). Excellent thermal stability, Good corrosion resistance (no surface plating treatment, if necessary for good exterior appearance, can also be coated or painted), the diversity of shape and size, reasonable price, low mold fees.
Disadvantages: the coercivity is very low (typically less than 160kA / m), the nonlinear demagnetization curve, so the resistance to demagnetization is poor; Hard and brittle, and cannot be cold work, it must be made by casting or sintering. Also because this, finished magnet may have tiny cracks and voids; this will not affect the performance, except this is large in size.
Application of AlNiCo
AlNiCo is mainly used in place where need high magnetic field and high temperature; such as traveling wave tubes, electric guitar pickups, microphones, sensors, speakers, cow magnet, meters, motors and other industrial products; application areas includes aerospace, military field, automotive industry, and security systems.
Magnetic Properties of Cast Alnico Magnet
MagneticProperties of Sintered Alnico Magnet