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Answered 2009-11-21 22:51:03

Neodymium NdFeB rare earth magnets are sintered by powder metallurgy with chemical composition of Nd, Fe, B and other minor elements.

Neodymium Iron Boron (NdFeB) magnets are composed of Nd, Fe, B, Dy, Co and other minor elements. NdFeB neodymium magnets are the rare earth magnet with the highest magnetic performance and coercive force in the world.

Production Process of Rare Earth Neodymium Magnets

1. Vacuum Melting

Compositions of neodymium, iron , iron-boron, dysprosium and minor additions including cobalt , copper , gallium, aluminum and others are mixed and induce-melted to form Nd2Fe14B phase and other necessary structures required for high performance permanent magnets. The melting temperature reaches over 1300o C. Usually repeated melting is needed to be produce an even phase and structure distribution .

2. Crushing

The ingots from vacuum melting process are crushed into coarse powder directly , or strip cast followed by HDDR processing into coarse powder .

3. Jet Milling

The coarse powder further milled into required particles sized about 3 microns in diameter by a jet miller . Those particles become single-domain and anisotropic which are critical for producing a high coercivity magnet. Jet milling is the most effective way to mill the particles so far.

4. Pressing

Compact the fined powder to re-produces block magnets. Usually a magnetic field is applied during pressing to align those anisotropic particles in order to produces maximum magnetic output in particular direction. There are two pressing methods, transverse and axial , depend on different application. Isostatic pressing is normally used to further densify magnets to 75-80% .

5. Vacuum Sintering

The compacted magnets are sintered ate temperature above 1000 o C and for many hours to be solidifiedand compacted further more up to 99% by shrinking its body. A required microstructure between particles for high performance permanent magnets is also formed in this stage. Some following heat-treatments are needed to stabilize the magnets .

6. Machining

Shrinkage and distortion during sintering is too difficult to control adequately and magnets normally need at least a " clean up" grind on the surface. Small parts are cut or sliced precisely forma big block to meet the demanding tolerances and different shapes .

7. Surface Treatment

Various surface treatments can be applied on the final products . They include zinc, nickel ,Ni-Cu-Ni multi-layer, e-coating , epoxy and others. They provide different surface finishing, appearance and corrosion resistance, applicable in different application environments.

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.A Navigator used to find directions using a compass and master.Ball magnets are made of neodymium a rare earth magnet.

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The most common permanent magnets are: neodymium magnets, which are composed of neodymium, iron and boron; Samarium Cobalt magnets, which are composed of samarium, cobalt and iron; and ceramic magnets. Here is a link to information about the first 2 which are called rare earth magnets.

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Neodymium is an element, a rare earth transitional element with the atomic number 60.

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Neodymium is Rare earth Metal, also known as a Lanthanide

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Where is ball - ended magnets used?

A Ball-ended magnet is a magnet,whose last part has two ball like magnetized component.It is mainly found in China and East Europe.It is mainly used for the devlopment of sciences.It is a main part for a mathematician and ecologist.A Navigator used to find directions using a compass and master.Ball magnets are made of neodymium a rare earth magnet. The ball magnets are very strong and can be twisted and used to form different patterns and shapes.Neodymium is a chemical element with the symbol Nd and atomic number 60. It is a rare earth metal that has a silvery metallic shine. Neodymium is very strong and is used to make high strength magnets. Neodymium is used for many other industrial purposes.

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Neodymium is a rare metal found on earth. It is found in misch metal, and makes up about eighteen percent of it.

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Rare-earth magnets are the strongest type of permanent magnets made, producing significantly stronger magnetic fields. You can make substitutions but you won't get the same strength of magnetism.

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Smaller magnets may be stronger than bigger magnets. It depends on what they are made of. Rare earth magnets are more powerful than plain iron magnets.

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There are several types of magnets, and this categorization depends of the materials that compose the magnet itself or as you called it, to what it "contains": 1. First magnets: natural magnet (magnetite, ceramic), iron and steel (metal). 2. Major traditional magnets: Alnicos (metal) and ferrite (ceramic). Ferrite magnetsare made of the most common, and is considered a hard material. The alnico is considered as a soft material (used for cores of transformers and electromagnets). 3. Super magnets or rare earth magnets: cobalt magnets with rare earth (such as the Neodymium-Iron-Boron (NIB or NiFeB), Aluminum-Nickel-Cobalt (AlNiCo) and others, and neodymium (both metal). 4. The electromagnet: iron or steel with an electric field around it. 5. "Plastic" magnets: mixture of plastic with magnetic material, like those you can stick in the refrigerator.

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What is a bastnasite?

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