Introduction

 

The EUROMAGNET Ltd. is in the Hungarian magnetproduction a very determining factor. Our business is capable to supply all the specific and basic properties of magnets, like: anisotrop-ferrite, isotropic-ferrite, AlNiCo, Samarium-Cobalt, Neodymium (Rare earth), magnet foil, tapes, bands. Beyond this products, we can supply magnetsystems, metal separators, lifters and magnetic fasteners.

 

Our products can be ordered – depending on usage – in magnetized or non magnetized conditions. For those cutomers, who intend to make a pre-order, we can supply our products and parts in the JIT system. Customer satisfaction is our most crucial goal and success criteria, we place great emphasis on efficient and prompt response to customers’ requirements and do utmost efforts to meet customer’s requirements. Therefore, we provide free services. 

 

At EUROMAGNET Ltd, since 2002 using the ISO 9001 quality controll system to satisfy our customers requirements world wide.

 

The EUROMAGNET Ltd is representing the good quality and precision!  

 

 

 

 

 

 

Sintered Neodymium (NdFeB)

 

Rare Earths magnets are the most advanced commercialized permanent magnet materials. Collectively known as Rare Earth are the Neodymium Iron Boron (NdFeB) magnets and Samarium Cobalt (SmCo) magnets. Within each of these classes of Rare Earth magnets are a number of different grades, which span a wide range of properties and application requirements. NdFeB magnets are avaiable in sintered as well as bonded forms. The bonded form of the material can be produced with close tolerances off tool, with little or no finishing required. 

 

The sintered form usually requires some finishing operations in order to hold close mechanical tolerances. Rare Earth magnets are brittle, and mechaning operations should be performed prior to magnetization, using diamond tools.

 

 

Magnetic properties

 

Sintered Neodymium Iron Boron magnets are high performance energy products ranging to 50 MGOe and are in stock, ready to fabricate and ship.

 

Parts

 

Various parts made from Sintered Neodymium Iron Boron magnets boast magnetic energy values ranging from 18 MGOe to over 50 MGOe, depending on grade and material. Magnets may be produced in large blocks for subsequent processing, or as tailor made components made by die pressing.

 

Surface

 

Nedymium magnets are higly susceptible to corrosion. Coating may be applied depending on the expected enviroment. We offer a variety of coating and planting options to prevent corrosion and mechanical damage.

 

Process

 

Sintered rare earth magnets are manufactured by a powder metallurgical process which involves the sintering of powder compacts under vacuum.

 

 

 

 

 

 

Bonded Neodymium

 

NdFeB magnets are avaiable in sintered as well as bonded forms. The sintered form usually requires somefinishing operations in order to hold close mechanical tolerances. The bonded form of the material can be produced with close tolerances off tool, wiht little or no finishing required. It is widely used in auto-industry, home appliance, instrument and micro motor production etc, due to its excellent performance both inmagnetic property and mechanical characteristics.

Magnetic properties

 

The rare earth magnet alloy are usually formed by powder metallurgical processes. The magnetic performance of all grades is optimized by applying a magnetic field during the pressing operation. Pressing and aligning techniques can substantially vary degree of orientation and the residual induction (Br) of the finished magnet.

Parts

 

Bonded Neodymium Iron Boron magnets can be produced with close tolerances off tool, with little or no finishing required. Various parts boast magnetic energy values ranging from 18 MGOe to over 48 MGOe, depending on rade and material. Neodymium Iron Boron magnets are brittle, and machining operations should be performed prior to magnetization, using diamond tools. We are equipped to fabricate these materials to customers blueprint specifications.

 

Surface

 

Bonded magnets are coated by electrophoresis coating process using different epoxy resins to meet customer’s requirements. The thickness of epoxy resin coating is various from 10 to 25 microns. One or two coating layers are often needed depending on different working environments. The coating is wiht grey or black color. The finished coating is smooth, free of voids and pin-holes. These coated magnets could survive in the salt fog spray test ( 5 % NaCl, 35OC) for 200 to 600 hours.

 

 

 

 

Samarium Cobalt (SmCo)

 

 

Samarium Cobalt (SmCo) magnets offer designer a tremendous combination of extremely high magnetic properties, outstanding thermal stability and excellent corrosion resistance. As part of the rare earth group of permanent magnets, Samarium Cobalt (SmCo) magnets typically fall in two families of materials. They include rare earth SmCo5 and Sm2Co17, and are commonly referred to as 1:5 and 2:17 materials.

 

 

 

Magnetic properties

 

Samarium Cobalt magnets are high performance energy products randing to 32 MGOe.

Parts

 

SmCo is extremely brittle, and highly, and highly prone to chipping and cracking. Special machining techniques must be used to machine this material. Various parts made from Samarium Cobalt magnets are with magnetic energy values ranging from 16 MGOe to over 32 MGOe, depending on grade and material. Magnets may be produced in large blocks for subsequent processing, or as tailor made components made by die pressing. We are equipped to fabricate these materials to customers blueprint specifications with shapes of blocks, rounds, rings, arcs, rods and more.

 

Surface

 

Samarium Cobalt magnets are highly resistant to corrosion and require no special surface treatment. This makes Samarium Cobalt an excellent choice for compact designs where high temperature environments may be present.

 

Process

 

The Samarium Cobalt magnet alloys are usually formed by powder metallurgical processes. The magnetic performance of all grades is optimized by applying a magnetic field during the pressing operation, thus producing a preffered direction of magnetization.

 

 

 

Samarium Cobalt magnets are high performance energy products ranging to 32MGOe. SmCo magnets are better able to withstand higher temperatures than other rare earth magnets. The Sm2Co17 type exhibits superior temperature property as compared to the Sm1Co5 type. The Curie temperature for Sm2Co17 could reach as high as 800 OC.

 

 

 

 

Hardferrite magnets

 

 

Hardferrite magnets are reliable and efficient components having a very good price to performance ratio. One of their main characteristics is their high resistance against humidity, solvents, alkalis and weak acids. Hard ferrites are permanent magnets which are the most economical and most widely used world wide. However, apart from the widespread use of Barium ferrites the higher coercive Strontium ferrites are also being increasingly used. Ferrite magnets can be produced isotropically or anisotropically.

 

When the anisotropic proper-ties are required a magnetic field is applied during the die-pressing, whereby the powder particles are aligned geometrically and thus magnetically. By the following sintering (heat treatment at a high temperature) the pressed parts get their definitive shape and strength. Surface treatment and magnetisation are optional steps upon request of the customer.

 

 

 

Mechanical Properties

 

Because of their ceramic character ferrites are brittle and susceptible to damage by impact and bending. Due to their hardness (Mohs 6-7) they have to be machined with diamond tools. Further physical data may be taken from the tables on the following pages.

 

Magnetic Properties

 

The working temperatures for ferrites lie mainly between –40° C and 250° C.

 

 

 

 

 

 

Alnico magnets

 

 

Alnico alloys basically consists of aluminium, nickel, copper, iron, and titanium. In some grades cobalt and/or titanium are left out. Also these alloys usually contain additions of silicon, columbium, zirconium or other materials to enhance heat treatment response of one of the magnetic characteristics.

 

 

 

Magnetic properties

 

Alnico magnets require magnetizing fields of about 3 Koe. Because of their relatively low coercivities, special care should be taken to assure that these magnets are not subjected to adverse repelling fields, since these could partially demagnetize to magnets. Magnetized magnets should be stored well to prevent possibility of partial demagnetization. If Alnicos are partially demagnetized, they may be easily magnetized again.

 

Parts 

 

Alnico is hard and brittle, therefore machning or drilling can not be accomplished by ordinary methods. Holes are usually cored in at the foundry, and magnets are cast close to final size and then finish machined to closer tolerances. These are materials used primarly for their magnetic capabilities as permanent magnets withoutregard to mechanical properties. These materials, preparted by good metallurgicalpractice, by their very nature will unavoidably contain a degree of physical imperfection. 

Surface

 

It is not generally recommended that these materials be used for structural or decorative purposes unless the physical requirements of the magnet are previously suitably specified. The corrosion resistance of Alnico is considered „excellent”, and no surface treatments are required. However, Alnico magnets are easily plated for cosmetic reasons if required. All magnet surfaces shall be free of foreign materials, which would tend to hold or collect extraneous particles on the magnet surfac in the unmagnetized condition.

 

 

 

 

 

 

Flexible magnets

 

Flexible magnetic materials offer the product designer a uniquely desirable combination of properties at lower cost than other magnet materials. With rubber-based characteristic, very flexible and bendy, product can be easily stamped, slit, punched and laminated. The flexibility and machinabilitiy of these materials permit design innovations and automated manufacturing techniques not possible with rigid or brittle materials. Higher energy flexible materials may sometimes replace ceramic materials.

 

Magnetic properties

 

Standard grades of flexible materials have energy products from 0.6MGOe to 1.6MGOe. Anisotorpic flexible magnet has magnetic properties higher than isotropic flexible magnets (about 30% higher) mainly tailored for dc-motors or strong holding applications.

 

 

 

Parts

 

Good resistance to demagetization and reasonable resistance to chemical agents. Usually used in small-sized motors, toys, stationary, decoration magnets on refrigerator, promotional and magnetic holding products.

 

Surface

 

No surface treatments are required to protect against corrosion.

 

Process

 

Produced by consolidating Strontium or Barium ferrite powder with polymer matrix, formed in profiles, strips and sheets by extrusion or calendering method, with optional self-adhesive backing. Flexible magnets - Magnetic properties