Alnico Magnets

Alnico was developed in the early 1930’s. During World War II it was used in military electronic applications. After the war it quickly spread into civilian versions of those applications and replaced magnet steel in many applications. High induction levels with good resistance to demagnetization and stability, due to its low temperature coefficient (0.02% / °C), at a reasonable cost made Alnico the magnet material of choice.

Alnico-Magnets

Alnico-Magnets

A high working temperature limit (550 °C / 1020 °F) makes Alnico especially well suited for sensitive automotive and aircraft sensor applications. Alnico is produced in many grades to fit the requirements of these applications, from Alnico 1 to Alnico 12, but the most popular grades are 2, 5 and 8. By comparison to newer materials, the coercivity of Alnico is low.

Where Alnico is appropriate, magnet size can be minimized if it can be magnetized after assembly into the magnetic circuit. If used independent of other circuit components, as in security applications, the effective length to diameter ratio (related to the permeance coefficient) must be great enough to cause the magnet to work above the knee in its second quadrant demagnetization curve. For critical applications, Alnico magnets may be calibrated to an established reference flux density value. A by-product of low coercivity is sensitivity to demagnetizing effects due to external magnetic fields, shock, and application temperatures. For critical applications, Alnico magnets can be temperature stabilized to minimize these effects.

Alnico magnet material is made by alloying aluminum, nickel and cobalt with iron. Some grades also contain copper and/or titanium. The alloying process is casting or sintering. The process and the heat treatment needed to optimize magnetic properties produces hard (Rc45) and brittle parts that are best shaped or finished by abrasive grinding. Cast parts are generally under 70 pounds and may be used as-is, but polar surfaces are usually ground flat and parallel. Sintering is confined to high volume parts in sizes under one cubic inch and an effective press length to diameter ratio under four.

Alnico-Gussmagnet

Alnico-Gussmagnet

To minimize the volume of magnet material required by an application, the entire magnetic circuit must be considered. An optimized circuit design results in a circuit permeance coefficient that causes the magnet to operate above the knee of its demagnetization curve by a margin large enough to offset anticipated operating demagnetizing effects. Optimized steel components result in an effective magnetic length greater than the magnet itself, but this is only effective if the magnet can be magnetized after assembly into the circuit. The alternate is to design the magnet shape to produce a load line, on its own, that intersects the BH curve above its knee, so minimal flux is lost due to the self demagnetizing factor upon removal from the magnetizing fixture. In either case, a magnetizing force of 3.0 kOe must be applied to Alnico 5 magnets and 7.0 kOe for Alnico 8. When magnetized in a magnetic circuit, the magnetizing pulse must be wide enough to allow eddy currents in the steel to decay before dropping below these values.

Permanent Magnet Bar AlNiCo

Permanent Magnet Bar AlNiCo

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Rod AlNiCo Permanent Magnet

Rod AlNiCo Permanent Magnet

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Permanent Magnet Rod AlNiCo

Permanent Magnet Rod AlNiCo

Permanent Magnet Rod AlNiCo, Round magnet, DxL 5x15mm, Round AlNiCo magnet, Components, Electromechanics, Solenoids, AlNiCo magnet, magnetism, permanent magnet, red magnet, remanence, motor magnet, u shaped magnet, diamagnetism, paramagnetism, ferromagnetism, antiferromagnetism, magnets, mini magnets, miniature magnets, magnetic fastener Permanent Magnet Rod AlNiCo Technical data Part No. HS-PMAL-R1505 Category Permanent magnet Enclosure type Rod Features w/o […]

Alnico 5 Channel Magnet

Casting Alnico 5 Channel Magnet

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Rectangular Channel Alnico Magnet

Rectangular Channel Alnico Magnet

Rectangular Channel Alnico Magnet, Cast Alnico Channel Shaped Magnets, Rectangle Alnico Channel Bar Magnet, Casting or Sintered Alnico Channels, Channel-shape C5 Cast Alnico Magnet China Factory Cast Rectangular Channel Alnico Magnet Feature: Part No.: HSACM-E04 Alnico Channel Grade C5 material, unpainted gray in color and have a maximum temperature of 550 degrees C Length tolerance […]

Cast Alnico Channel Magnet

Cast Alnico Channel Magnet

Cast Alnico Channel Magnet, Rectangle Alnico Channel Magnet, Casting Alnico Channel Bar Magnets, Alnico Channel Magnets, Sintered Alnico Channels, Alnico Channel Horseshoe Magnet, Cast Alnico Magnet Channel C5 China Supplier Cast Alnico Channel Magnet Feature: Part No.: HSACM-E03 Alnico Channel Grade C5 material, unpainted gray in color and have a maximum temperature of 550 degrees […]

Rectangle Alnico Channel Magnet

Rectangle Alnico Channel Magnet

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Alnico Channel Bar Magnets

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Alnico Channel Bar Magnets, Rectangle Alnico Channel Magnet, Alnico Channel Magnets, Alnico channels, Alnico Channel Horseshoe Magnet, Cast Alnico Magnet Channel Grade 5 China Supplier Alnico Channel Bar Magnets Feature: Part No.: HSACM-E01 Alnico Channel Grade 5 material, unpainted gray in color and have a maximum temperature of 550 degrees C Length tolerance is +/-0.045″, […]

AlNiCo Block Magnets

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AlNiCo Block Magnets, Sintered AlNiCo Rectangular Magnets, Cast Alnico Rectangle Permanent Magnet, Block AlNiCo Magnet, Square Alnico Magnet, ALNICO PLUG MAGNETS China Manufacturer AlNiCo Block Magnets –  high magnetic alnico rectangular magnet precision magnetic sensors for balance, alnico 5 cast alnico magnet alnico 5dg magnetic bar – Alnico magnet is an acronym referring to a family of iron alloys which […]

Customized Cast Alnico Magnets

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Customized Cast Alnico Magnets, Cast Aluminum Nickel Cobalt Magnets, Casting Alnico Permanent Magnet, Custom Alnico Magnet China Supplier, Alnico Gussmagnets Manufacturer Alnico magnets are manufactured using primarily two processes: Cast Alnico Magnets and Sintered Alnico Magnets Cast alnico magnets that are made by pouring melted alnico into a mold. The solidified material is rough ground and then heat treated […]

Custom Sintered Alnico Magnets

Custom Sintered Alnico Magnets

Custom Sintered Alnico Magnets, Sintered Aluminum Nickel Cobalt Magnets, Sintering Alnico Permanent Magnet, Customized Alnico Magnet China Supplier and Manufacturer Sintered Alnico Magnets – Alnico is composed primarily of aluminum (Al), nickel (Ni) and cobalt (Co). Alnico alloys are ferromagnetic, with a high coercivity (resistance to loss of magnetism). Before the development of rare earth magnets in the 1970s, they […]

Bar Alnico Magnets

Bar Alnico Magnets

Bar Alnico Magnets, Alnico bars, Alnico Square Bar Magnet, High Magnetic Cast Alnico Round Bar Magnet, Strong Holding Bar Magnet Casting Alnico China Supplier Bar Alnico Magnets  offer excellent temperature stability, high residual induction, and relatively high energies. Features include: • Temperature stability in high thigh-temperature applications, and a maximum working temperature of approximately 1000°F • […]