Neodymium Iron Boron (NdFeB)

Neodymium Magnets 05/06/2021

neodymium iron boron

Neodymium iron boron alloy

Like NdFeB (an alloy of neodymium, iron, and boron), various alloys keep their domains aligned and are used to make permanent magnets.

magnetic properties

In magnetism: Fundamentals

The strong magnetic field produced by a typical three-millimeter-thick magnet of this material is comparable to an electromagnet made of a copper loop carrying a current…

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Rare earth magnets based upon neodymium–iron–boron (NdFeB) are employed in much clean energy and high tech applications ...

This paper outlines the potential for the recycling of rare earth permanent magnets.

•Hydrogen can be used to efficiently extract NdFeB magnets from electrical devices.

•Hydrogen decrepitation reduces the magnets to a demagnetized hydrogenated powder.

•The hydrogenated powder can be re-processed into new NdFeB magnets.

•Re-processing includes re-sintering, HDDR, re-casting, or refining the alloy powder.

Abstract

The European Union and the United States have identified the rare earth metals as being at greatest supply risk of all the materials for clean energy technologies.

Of particular concern are neodymium and dysprosium, both of which are employed in neodymium–iron–boron-based magnets.

Recycling magnets based on these materials and contained within obsolete electronic equipment could provide an additional and secure supply.

In the present work, hydrogen has been employed as a processing agent to decrepitate sintered neodymium–iron–boron-based magnets contained within hard disk drives into a demagnetized, hydrogenated powder.

This powder was then extracted mechanically from the devices with an extraction efficiency of 90 ± 5% and processed further using a combination of sieves and ball bearings, to produce a powder containing <330 parts per million of nickel contamination.

It is then possible for the extracted powder to be re-processed in several ways, namely, directly by blending and re-sintering to form fully dense magnets, by Hydrogenation, Disproportionation, Desorption, Recombination processing to produce an anisotropic coercive powder suitable for bonded magnets, by re-melting;

or by chemical extraction of the rare earth elements from the alloy.

For example, it was shown that, by the re-sintering route, it was possible to recover >90% of the magnetic properties of the starting material with significantly less energy than that employed in primary magnet production.

The particular route used will depend upon the magnetic properties required, the level of contamination of the extracted material, and the compositional variation of the feedstock.

The various possibilities have been summarised in a flow diagram.

neodymium magnet gauss

Tesla is a unit of the magnetic field.

Another unit of the magnetic field is a gauss.

A refrigerator magnet is 100 gauss, a strong refrigerator magnet.

The typical strength of the Earth's magnetic field at its surface is around half a gauss.

So those are everyday units of magnetic fields.

There are 10,000 gausses in one tesla.

The magnets that we have here at the Magnet Lab range anywhere from 20 teslas all the way up to to 45 teslas for DC fields.

In pulsed fields, they can go as high as 100 Tesla, and even higher.

So the magnets that we have at the Magnet Lab are much stronger than what you'd find in everyday life.

And it's even more impressive when you realize that the energy required to produce a magnetic field goes like the square of the magnetic field.

So to go from a 1 tesla to a 10-tesla magnet requires 100 times more energy.

Nikola Tesla was a scientist around the turn of the century, and the designation for magnetic field is named after him.

What Is the Gauss Rating for a Strong Magnet?

The gauss is a measure of the strength of magnetic fields, relating force, length, and electric current.

It is used to conveniently measure weak fields, such as a small permanent magnet.

Because it’s a small unit, strong magnets will result in large measurements in gauss.

Gauss

A gauss is a unit of magnetic field strength named after mathematician Carl F.Gauss.

It’s useful for dealing with relatively weak magnetic forces.

The Earth’s magnetic field measures a few gausses.

Magnet Strength

The stronger the magnet, the denser its magnetic field.

Its field produces forces in other magnets and in metals.

Permanent Magnets

Currently, the strongest permanent magnets are those made with rare-earth metals such as neodymium.

Their magnetic strength can be more than 14,000 gausses.

This figure can also be stated as 14 Kilogauss (KGs).

MRI

Magnets used in Magnetic Resonance Imaging (MRI) machines are electromagnets that are supercooled with liquid helium.

They are the strongest magnets in regular use, running 20,000 to 70,000 gauss.

Experimental

Special magnets are used in scientific research to test the limits of magnet construction techniques and materials.

The strongest experimental magnets run about 45 teslas or 450,000 gausses.

neodymium magnet grade

All magnet materials demonstrate reversible strength loss as they approach Maximum Operating Temperature.

* NOTE: Unshielded open circuit ceramic magnets should not be subjected to more than 400°F.

Tolerances

For as pressed material, tolerance on the thickness (direction of magnetization) is ± .005.

Other dimensions are ± 2.5% or ± .010, whichever is greater.

According to IMA standards, visual imperfections such as hairline cracks, porosity, and minor chips are commonly found in sintered metallic magnets.

A chipped edge is considered acceptable if no more than 10% of the surface is missing.

Cracks are acceptable as long as they do not extend across more than 50% of the pole surface.

Magnetizing and Handling

Ceramic magnet material is extremely brittle and can chip or break if dropped on a hard surface, or if allowed to “jump at” an attractive object.

Handle with care.

The weakest grade of ceramic material is grade 1, which is typically non-oriented.

Grades 5 and 8 are oriented ceramic materials.

Grade 8 is the strongest ceramic magnet material available (Refer to properties chart below).

When making magnetic assemblies with ceramic, it is typically easier for production purposes to magnetize the product after assembly.

Machining

Since ceramic material is so brittle, it requires special machining techniques and equipment.

We are fully equipped to cut and grind ceramic material to your specifications.

neodymium magnet manufacturer

Neodymium Magnet Market 2016-2021 Key Manufacturers

the latest research information on '2015 Market Research Report on Global Neodymium Magnet Industry' was published in Dec 2015, within its store's chemical market intelligence collection.

This is the latest Neodymium Magnet market study that is comprehensive in nature, details the industry's current state while providing a basic overview of the industry, including definitions, classifications, applications, and industry chain structure.

The Neodymium Magnet market analysis is provided for the international markets, including development trends, competitive landscape analysis, and key regions' development status.

Development policies and plans of the Neodymium Magnet market are discussed as well as manufacturing processes and cost structures are analyzed.

This report also states import/export consumption, supply and demand Figures, cost, price, revenue, and gross margins.

The report focuses on the global major leading industry players of the Neodymium Magnet market providing information such as company profiles, product picture, and specification, capacity, production, price, cost, revenue, and contact information.

Upstream raw materials and equipment and downstream demand analysis are also carried out for the Neodymium Magnet market.

The Neodymium Magnet industry development trends and marketing channels are analyzed.

Finally, the feasibility of new investment projects is assessed and overall research conclusions are offered.

With 218 tables and figures to support the Neodymium Magnet market analysis, this research provides key statistics on the state of the industry and is a valuable source of guidance and direction for companies and individuals interested in the market.

Order a copy of this 2015 Market Research Report on Global Neodymium Magnet Industry at

A dedicated chapter on the development trend of the Neodymium Magnet market for 2016-2021 in this report covers data and information on capacity and production overview, production market share analysis, sales overview, supply, sales, and shortage, import, export, and consumption as well as cost, price, revenue and gross margin of Neodymium Magnet.

Some of the tables and figures provided in the Global Neodymium Magnet Market Report 2015 research report include:

Table 2010-2015 Global Major Manufacturers Neodymium Magnet Capacity Market Share List

Figure 2010-2015 China Neodymium Magnet Capacity Production and Growth Rate

Table 2010-2015 Global Neodymium Magnet Sales and Growth Rate

Table Neodymium Magnet Raw Materials Major Suppliers and Contact Information List

Table Neodymium Magnet Manufacturing Equipment Suppliers and Contact Information List

Table Neodymium Magnet Major Suppliers and Contact Information

Table Neodymium Magnet Key Consumers and Their Contact Information List

Table Global Neodymium Magnet Supply Chain Relationship of Major Suppliers

Table 2015 Neodymium Magnet New Project SWOT Analysis

Table Neodymium Magnet New Project Investment Return and Feasibility Analysis

Explore more reports on the Chemicals market at

Another research study titled "2015 Deep Research Report on Global Sintered NdFeB Magnet Industry" forecasts the market analysis provided for the Global and China markets including development trends, competitive landscape analysis, and key regions development status.

The Sintered NdFeB Magnet industry development trends and marketing channels are analyzed.

Finally, the feasibility of new investment projects are assessed and overall research conclusions offered.

neodymium magnets

Magnets in Neodymium. Disks Rings Blocks and Spheres in Neodymium. Disks, rings, blocks, and magnetic spheres in Neodymium (rare earth)

Electromagnets and Electro-permanent Devices

Holding, traction, and push Electromagnets, for lifting ferromagnetic particles at distance.

Electro-permanent devices for lifting and transporting metallic particles safely.

See our complete catalog of electromagnetic and Electro-permanent devices!

Magnetic Equipment

Equipment for Clamping Positioning and Magnetic Transport

Finger guards, chuck, tracks, conveyors, depalletizers, spacer sheets, sweepers, boomerangs and positioning devices, indicator holders, ground clamp.

See our complete catalog of Magnetic Equipment!

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Magnetic Measurement

Technical Instruments: Gaussmeters Magnetizers and Demagnetizers

Portable and bench Gaussmeters.

Capacity discharge magnetizers.

Tunnel and plate demagnetizers.

Helmholtz coil and Fluxometer.

Polar Indicators.

Company Advantages

1. Structurally safe and adaptable to neodymium pot magnets, neodymium iron boron is superior to other products.

Its special plating offers excellent adhesion to the objects

2. Its chemical stability enables it to withstand chemical corrosion

3. The superior performance of the product is crowd-pleasing in the market.

It can keep its magnetic field for a long time

4. This product can be magnetized by increasing its thickness

Super Strong Neodymium Ferromagnetic Separator For Magnetic Pulley/drum

The permanent magnetic belt conveyors are designed to remove magnetic materials during crushing, screening, and sorting. With a lifetime warranty on the magnetic strength, a stainless steel housing, and proprietary magnetic circuitry, the magnetic conveyor belts are offered in both Ceramic and Rare Earth magnet materials and are built to last and endure the toughest environments and high volume material flows.

Magnetic belt conveyors effectively convey the ferrous objects on high speed horizontal and inclined to vertical conveyor belts.

Below the conveying belt, there is a permanent rail that attracts the ferrous objects to the belt.

This magnetic attraction acts as a clamping force against the conveyor.

This causes the ferrous objects to move with the belt and able to overcome any angle of incline or decline.

Conveyors are available with different belt widths.

Product parameters

N35-N52, 35M-50M, 35H-48H, 35SH-45SH, 30UH-40UH, 30EH-38EH

Shape，Disc Cylinder Block & Bar Cube Ring & Tube Sphere & Ball Arc & Wedge Other

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