Neodymium Iron Boron

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Neodymium Iron Boron Magnets

Known as rare earth magnets, Neodymium Iron Boron magnets are alloys of the Lanthanide group of elements. NdFeB magnets offer the highest energy product per unit mass, and highest energy product per unit cost of any current permanent magnet material.

Energy Products range from 30 to 55 MGOe, with recommended operating temperatures from 60º – 220ºC, and the temperature coefficient of residual induction ranges from -0.09 to -0.13%/°C.

NdFeB - Injection Molded

NdFeB - Bonded

NdFeB - Sintered

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Benefits of NdFeB Magnets

NdFeB magnets offer significant advantages that go beyond their compact size, transforming industries with their remarkable strength, durability, and diverse applications.

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Benefits of NdFeB Magnets

Batch-to-batch Uniformity: The BHmax of our magnets has a Cpk greater than 1.6.

High Maximum Working Temperature: Our AH series of NdFeB magnets have working temperatures up to 230°C.

Excellent Adhesion of Plating to Magnet: Our magnets develop up to 2,175 psi attractive force between the plating and the magnet.

Excellent Corrosion Resistance: BJA Magnetics offers a number of coatings including, Nickel, Epoxy, Zinc, Tin, Phosphate, Parylene, Hybrid Coatings, Aluminum Spray coating, and IVD-Aluminum [Ion Vapor Deposition of Aluminum].

Low Surface Tension: Adhesives require a properly prepared surface for bonding. Good wet-ability is one of the keys to good bonding. The shear strength for our Ni Plated magnets is 50% greater than competitive magnets.

Improved Corrosion Resistance: The HAST protocol used on uncoated Neodymium Iron Boron magnets can qualitatively reflect the service life of the magnet. This test exposes the magnet to 130°C, 95% RH, at 2 ATM for 20 days. The magnet is massed before and after the test. Our magnets measure a weight loss of less than 3 mg/cm2. Competitors’ magnets can lose over 10 times more.

Surface Treatments: The corrosion resistance [sensitivity to oxidation] of NdFeB magnets is far better than it was just a few years ago due to changes in chemical composition. BJA Magnetics still recommends coating or plating for most applications. Plating NdFeB is a difficult process, and commercial plating houses are unlikely to be able to achieve plating with good adhesion. Nickel, Zinc, or Tin plating provides good corrosion resistance for NdFeB magnets.

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NdFeB Coating, Sealing & Encapsulation

We’re able to plate your parts with numerous plating’s including organic coatings, electrolytic nickel plating, and zinc plating.

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NdFeB Coating, Sealing & Encapsulation

A variety of organic coatings have been successfully developed for NdFeB, exhibiting good corrosion resistance characteristics.

The latest advance in coating technology is Ion Vapor Deposition of Aluminum, typically referred to as “IVD Aluminum.” For especially harsh environments, it may be advisable to use a combination of coating techniques or to encapsulate the material in a sealed housing.

Organic Coatings: Epoxies, and urethanes are not hermetic (do not seal against moisture or oxygen), but do slow the reaction with the magnet.

Nickel: Electrolytic nickel provides a hermetic seal, but is prone to corrosion in salt, and acidic conditions. Electroless (chemical) nickel offers improved coating into crevices, internal threads, ID holes, but is less protective of the magnet.

Zinc Plating: Sacrificial, releasing particulates. By itself, the performance is marginal, so conversion coatings are often used in conjunction with zinc.

Aluminum IVD: A malleable coating that requires bead blasting, and conversion coatings to provide a good seal against the elements.

Conversion Coatings: Provides short-term protection only, but are used in conjunction with other coatings to enhance performance.

Combination Coatings: Typically nickel plating plus an organic overcoat; offers improved resistance to salt spray plus protection from moisture and oxygen.

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Common Applications for Neodymium Iron Boron Magnets

Neodymium Iron Boron magnets are widely utilized in various applications

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Common Applications for Neodymium Iron Boron Magnets

  • Holding systems requiring very high holding forces
  • High field yoke magnets
  • High performance stepper, DC, servo, linear, and voice coil motors
  • Magnetic bearings
  • Magnetic couplings
  • Loudspeakers
  • Halbach arrays
  • Headphones
  • Microphones
  • Magnetic separation
  • Instrumentation
  • Switches
  • Relays
  • Magnetic resonance
  • Sensor for Reed Switches, and Hall Effect devices
  • Sputtering
  • Vacuum deposition
  • Charged particle beam guidance
  • Particle accelerators
  • Undulators
  • Wigglers
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NdFeB Preparation

BJA Magnetics prepares its anisotropic powders by either casting an alloy with a mold, or strip casting. Strip casting offers the advantage of better chemical stability. Subsequently, the ingot from the mold or the flakes from strip casting are pulverized to a uniform grain/particle size. The best method for obtaining the desired grain size is by HDDR.

The HDDR [hydrogenation-decomposition-desorption-recombination] process yields a more homogenous particle size with a minimum of α-Fe, and Nd-rich phases. Anisotropic Nd-Fe-B, HDDR powders prepared from strip cast alloys are used for the HAST [Highly Accelerated Stress Test] grades of NdFeB Magnets, including N, H, SH, UH, EH, and BJA Magnetics exclusive “W” grades for Wind Power applications.

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At BJA Magnetics, our dedication lies in delivering premium Neodymium Iron Boron (NdFeB) magnets to fulfill all your magnetic requirements. With a wide range of options and inclusive services, we assure customized solutions that align with your specific needs. Feel free to contact us with any inquiries, and we are committed to assisting you in discovering the ideal magnetic solution for your applications.
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