Industrial Magnets Advantages and Disadvantages

March 22, 2011 - PRLog -- Alnico magnets are usually composed of aluminum, nickel and cobalt and sometimes also contain copper and titanium. A hard and brittle material, Alnico is known for sometimes being difficult to rework.

You can have alnico manufactured in a number of shapes such as cylinders, horseshoes, blocks, discs, rings and rods. With high residual inductions and high energies alnico magnets are normally manufactured through sintering or casting. Casting is a process where molten metal alloy is poured into a mold and processed through a number of various heat-treated cycles. When two main materials are combined and then melted to the point where they stick together is known as sintering, a common process used when manufacturing magnets.

Sintering alnico results in a fine alnico powder that is then compacted in a press. Alnico magnets provide many benefits. In addition to being affordable and strong they can also resist extremely high temperatures and they are able to keep their magnetic qualities for a long period of time. When it comes to industrial and consumer applications alnico magnets are a great option.

Ceramic and iron oxide are usually the base materials for ceramic ferrite magnets. Ceramic magnets are made by pressing and sintering magnetic powders and ceramic. Sintering is used when manufacturing magnets and it heats two main materials to a point when they stick together. In general, ceramic magnets are usually hard and brittle.Ceramic ferrite magnets can be categorized as either hard ferrites or soft ferrites, although these terms are misleading.

The differences between hard and soft ferrite magnets is not in the density of the material, as the terms hard and soft suggest, instead the difference lies in the intensity of the magnetic field needed to demagnetize the magnets. Hard ferrite magnets need a stronger, more intensive magnetic field to demagnetize .

The unique quality of a ceramic magnet is that it can be applied to flexible fabrics, which makes them great for crafts, decorations and use in home, school or work. Ceramic magnets are affordable and have a wide variety of uses.

Of all the rare earth magnets neodymium is the most popular because of its affordability and strength. A rare earth magnet is a category of magnets which are strong and permanent, which means they do not easily lose their magnetism. Developed in the 1970s and 1980s, rare earth magnets are the strongest type of permanent magnet that is made. Rare earth magnets are composed of alloys of rare earth elements, including iron, nickel and cobalt.

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A coating or plating is often applied to rare earth magnets because they are generally brittle and often break, chip or corrode. Samarium-cobalt and neodymium are to of the most commonly used rare earth magnets. Neodymium is the strongest of all permanent magnets, including samarium-cobalt, alnico and ferrite.

The term rare earth magnet is misleading, in fact neodymium is not made of rare elements at all, it is composed of common elements like boron, iron and neodymium which are commonly found and is why neodymium is not expensive to produce. Neodymium magnets have numerous uses in a number of different fields including industrial, security, health, mechanics and electronics.

High energy strip magnets use a nitrile rubber base to make increase their resistance to oils and acid, which is why they are such a powerful type of flexible magnetic strip. The amount of magnetic energy stored in a magnet is measured using MGOe. More powerful than normal flexible magnetic strips, high energy strip magnets come in 1.1 - 1.6 MGOe. Available in many different shapes and sizes magnetic strips are often laminated and have adhesive backing.

Flexible magnetic strips truly are versatile. They will stick to any ferrous surface, can be cut to length, are available in a number of widths and are ideal for punching and laminating. Magnetic tape has a variety of uses in school, work and around the home. Magnetic tape can stick to many surfaces because the back has a magnetic face and the front has an adhesive face. The versatility of magnetic tape means that it can be used in a variety of applications.

Block magnets are durable and are a good choice for industrial settings. Depending on the need the composition of your block magnet will differ, which is why you must consider the conditions and purpose for the magnet before you make a decision. A rare earth magnet like neodymium or samarium-cobalt is stronger than alnico and ceramic magnets, which means they will work well in industrial or heavy duty applications.

In addition to magnet strength, also consider whether you need your block magnet to perform well in extremely high temperatures. If so, then you will want to take that into consideration when choosing the magnet type, as different magnets lose or maintain their magnetism at different temperatures. The type of magnet you will use will depend on your needs, but keep in mind how easy or difficult it is to demagnetize the magnet when you make your decision.

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