Types of Permanent Magnets

Magnosphere is leading The Way In Permanent Magnets, Magnet Assemblies and Specialty Magnetic Engineering Services In Key Industries, Aerospace, Medical

Magnosphere www.magnosphere.com works with a variety of industries to supply industrial strength magnets that can withstand extreme temperatures and conditions. We provide complete engineering, design and consulting services. We collaborate with your team to create well-designed, flawlessly manufactured permanent magnets or a complete magnetic assembly specific to your need and application. We are able to provide rapid prototypes and quick distribution of the final product no matter the complexity of the project

Permanent magnets are objects made from a material that is magnetized, which creates its own persistent magnetic field. There are several types of industrial permanent magnets including Ceramic, Alnico, Samarium Cobalt, Neodymium Iron Boron, injection molded, and flexible magnets. Magnosphere specializes in distributing Rare Earth magnets, Alnico magnets, and Ceramic magnets for a variety of industries including oil and gas, food, milling, pharmaceutical, and medical.

These magnets can be both anisotropic and isotropic. Anisotropic grades are oriented in the manufacturing direction and must be magnetized in the direction of orientation. Isotropic grades are not oriented and can be magnetized in any direction.

What is a Rare Earth Magnet??

Rare earth magnets are very strong magnets made from alloys of rare earth elements. They are the strongest among the permanent magnets made. These magnets can be manufactured through sintering, compression bonding, injection molding, and extrusion.

Since their prices became competitive in the 1990s, rare earth magnets have been replacing Alnico and Ferrite magnets in many applications in modern technology requiring powerful magnets. Their greater strength allows smaller and lighter magnets to be used for given applications that require high strength. The material is easily magnetized in one direction, but is able to prevent magnetic pull in any other direction.

What is an Alnico Magnet?

Alnico magnets, composed of primarily aluminum (Al), nickel (Ni), and cobalt (Co), were developed in the 1940s. This class of magnet remains a preferred material because of its excellent temperature stability, high magnetic flux density, and resistance to corrosion.

Alnico magnets are manufactured through a casting or sintering process. The casting process allows the magnet to be manufactured into intricate and complex shapes. Sintered Alnico is made from a powdered mixture of ingredients that are pressed into a die under tons of pressure. The Sintering process allows for the magnets to be manufactured to tighter tolerances and higher mechanical strength.

What is a Ceramic Magnet?

Ceramic Magnets are also known as Hard Ferrite Magnets, are composed of barium or strontium, were developed in the early 1960's as an alternative to the more expensive metallic magnets. This class of magnet is very hard, brittle and possesses lower energy characteristics compared to other magnetic materials. However, ceramic Ferrite magnets are very popular and widely used because of its excellent resistance to demagnetization, corrosion, and the advantageous pricing.

Sintering, or injection molding manufactures Ferrite magnets. Ceramic magnets retain about 45% of their room-temperature magnetic specifications at 350 °F. Degradation with increasing temperature is nearly linear, and changes in magnetization are essentially reversible up to approximately 840 °F, at which temperature ceramic magnets become completely demagnetized. Ceramic magnets exposed to temperatures up to 1800 °F can be re-magnetized for continued use. However, changes are irreversible above 1800 °F.

Ceramic 5 magnets are the most commonly used and must be magnetized in the direction of their orientation. Ceramic 8 magnets are used for their excellent peak energy product and greater resistance to demagnetization than Ceramic 5 magnets. They also must be magnetized in the direction of their orientation. Ceramic 8 is an excellent choice wherever magnet length is at minimum or where the magnetic circuit is subject to severe demagnetizing field. See table below for grades and properties of Ceramic magnets.

Magnosphere - Specialty Magnetic Engineering Services

In a perfect world, off-the-shelf magnetic products would offer optimum performance in the desired size and weight. In reality, almost every application can benefit from a tailormade solution. Improve your product or process with specialty magnetic engineering services from Magnosphere. Whether you have an approved design but lack manufacturing support or encounter an obstacle requiring a product designed from scratch, we can meet your needs on time and within budget.?

Magnosphere Engineering has garnered experience in the research space, which requires high-complexity, low volume magnet assemblies. For startups and innovators looking to prototype a new idea, we can provide the most complex assemblies and will work tirelessly to ensure your product is shipped on-spec.

We have consistently expanded the machinery used in our production processes to handle increasingly complex and unique parts. Assemblies requiring special alloys, uncommon magnet arrangements, or seemingly impossible creations can be turned into a reality with our collection of cutting edge CNC machines.

Bolstering Magnetic Device Performance Through Value-Driven Engineering?

Magnosphere is an ISO 9001:2015- and AS9100D-certified company for magnets, separation products, holding assemblies, and for industrial applications. With capabilities to offer high-performing magnetic assemblies tailored to a customer’s exact specifications.?

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