- <p> Alnico is an acronym referring to a family of iron alloys which in addition to iron are composed primarily of aluminium (Al), nickel (Ni) and cobalt (Co), hence al-ni-co. They also include copper, and sometimes titanium. Alnico alloys are ferromagnetic, with a high coercivity (resistance to loss of magnetism) and are used to make permanent magnets. Before the development of rare earth magnets in the 1970s, they were the strongest type of permanent magnet. Other trade names for alloys in this family are: Alni, Alcomax, Hycomax, Columax, and Ticonal.<p><p> The composition of alnico alloys is typically 8–12% Al, 15–26% Ni, 5–24% Co, up to 6% Cu, up to 1% Ti, and the balance is Fe. The development of alnico began in 1931, when T. Mishima in Japan discovered that an alloy of iron, nickel, and aluminum had a coercivity of 400 oersted (Oe; 32 kA/m), double that of the best magnet steels of the time.
- <p> Alnico alloys make strong permanent magnets, and can be magnetised to produce strong magnetic fields. Of the more commonly available magnets, only rare-earth magnets such as neodymium and samarium-cobalt are stronger. Alnico magnets produce magnetic field strength at their poles as high as 1500 gauss (0.15 tesla), or about 3000 times the strength of Earth's magnetic field. Some brands 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.
- <p>1. Inner magnetic voltmeter/ammeter, electronic type power energy measuring instrument, avometer, flowmeter<p>2. A wide range of magnetic sensor, polarized relay, temperature and pressure controller<p>3. Buzzer of Mobile phone, hearing aids, mini speaker<p>4. lighter of automobile, odometer of automobile and motorcycle, permanent motor, absorptive appliance. <p>5. Widely applied in high stability fields like aviation, spaceflight and military technology<p>6. Motorcycle, permanent motor, absorptive appliance
Cast AlNiCo Demagnetisation Curve
Sintered AlNiCo Demagnetisation Curve