General Introduction

Alnico is the permanent magnets composed primarily of Aluminum (Al), Nickel (Ni) and Cobalt (Co). They also include Copper, Ferrum, and sometimes Titanium.
Two kinds of Alnico, Cast AlNiCo and Sintered AlNiCo, are commercial according to their different manufacturing process.

Features

Alnico alloys are ferromagnetic with high magnetic flux density, resistance to corrosion and excellent temperature stability, while relatively small resistance against demagnetization.
Some grades of alnico are isotropic and can be efficiently magnetized in any direction. Other types, such as Alnico 5 and Alnico 8, are anisotropic, with each having a preferred direction of magnetization, or orientation. Anisotropic alloys generally have greater magnetic capacity in a preferred orientation than isotropic types.
Alnico alloys have some of the highest Curie temperatures of any magnetic material, around 800 °C (1,470 °F), although the maximum working temperature is normally limited to around 538 °C (1,000 °F).
Alnico magnets are electrically conductive, unlike ceramic magnets.

Typical Grades

Cast AlNiCo: LNG 10-96 / AlNiCo 2-9
Sintered AlNiCo: FLN(G/GT) 8-42 / AlNiCo 2-9

Mechanical Property

Some important properties used to compare permanent magnets are:

• Remanence (Br), measure the strength of the magnetic field;
• Coercivity (Hcb / Hcj), the material's resistance to becoming demagnetized;
• Energy product (BHmax), the density of magnetic energy, which relates to the magnetic flux output per unit volume. Higher values indicate stronger magnets;
• Curie temperature (Tc), the temperature at which the material loses its magnetism;

You could check the Property Table in the below linkage for reference

• Cast AlNiCo: Property Table
• Sintered AlNiCo: Property Table

Shape

AlNiCo magnets magnets could be made into various shapes:

• Disk/Cylinder, Bar/Block, Ring, Arc, Horseshoe, etc.

Custom design is available to us for client`s specific needs

Application

Some examples of AlNiCo Magnets applications:

• Automotive, aerospace and military sensors
• Instruments communication control systems
• Audio Devices
• Magnetron
• Traveling-wave tubes (TWT)
• Some applications requiring for high temperature stability

Production

Cast AlNiCo:

Raw Materials → Mixing → Melting → Mold Casting → Ingots Selection → Heat Treatment → Tumbling → Magnetic Inspection → Machining → Cleaning and Driving → Machining Inspection → General Inspecting → Packing & Delivery

Sintered AlNiCo:

Raw Materials → Pressing → Sintering → Heat Treatment → Tumbling → Magnetic Inspection → Machining → Cleaning and Driving → General Inspecting → Packing & Delivery