Question

# The constituents of alloy which is used in the manufacture of permanent magnets are:

Hint: Alnico is an alloy which is used in the manufacture of permanent magnets. It is found to produce strong magnetic fields hence is used to produce permanent magnets.

- Alnico alloy is composed mainly of aluminium (Al), nickel (Ni) and cobalt (Co), hence it is named as an acronym al-ni-co.
- Alnico magnets are manufactured by casting or sintering processes .
- The composition of alnico alloys includes: 8–12% Al, 5–24% Co, and 15–26% Ni. Alnico alloys are basically ferromagnetic in nature, and are used to make permanent magnets.
- There are several properties of alnico found like:
- Alnico alloys are found to have temperature around ${{800}^{\circ }}C$, which is some of the highest Curie temperatures of any magnetic material.
- Alnico alloys are found to be magnetised to produce strong magnetic fields and thus can be used in making strong permanent magnets.
- Alnico magnets produce magnetic field strength at their poles about 3000 times the strength of Earth's magnetic field.
- Alnico magnets are electrically conductive in nature.
- It is having many uses, it is widely used in industrial applications where strong permanent magnets are needed, like: in microphones, loudspeakers, sensors, magnetron tubes, electric motors, electric guitar pickups.
- Hence, we can say that the constituents of alloy which are used in the manufacture of permanent magnets are: aluminium (Al), nickel (Ni) and cobalt (Co).

Note:
- As we know that Alnico alloy is composed mainly of aluminium (Al), nickel (Ni) and cobalt (Co) and there were several traces of copper and titanium are also found balanced with iron.