- NdFeB Magnets / Neodymium magnet
- Arc/Segment/Tile Magnets
- Block Magnets
- Cube Magnets
- Cylinder / Rod Magnets
- Disc Magnets
- Ring Magnets
- Shpere Magnets
- Abonomity/Irregular Magnets
- SmCo Magnets
- Cast AlNiCo Magnets
- Hard Ferrite Magnets
- Magnetic Applicance
- Magnetic Separator/Filter
- Magnetic Grate
- Pin board Magnets
- Magnetic Lifter
- Standard permanent magnetic chuck
- Dense permanent magnetic chuck
- Super Electric Permanent magnetic chuck
- Electric Permanent magnetic chuck
- Pot Magnet
- Magnetic Arm Holder
- Magnetic Rack
- Magnetic Welding Holder
Tel:+86-27-87003358
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Add:No.1975 Jiangnan Road,Ningbo,China,315040
Add:Wuhan Jinneng Wind Electrical Industrial Park,Wuhan,China,430075
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info@climemagnet.com
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NdFeB Magnets / Neodymium Magnets
Sintered Neodymium Iron Boron magnet (Ndfeb magnets,magnet ring,magnet tiles,block magnets, magnet cylinder,ball magnets, rare earth magnet, permanent magnets)
The Sintered NdFeB magnet has the high remanence , high coercive force, high energy product and high performance,cost ratio, also have the high temperature model to suit for high temperature condition. It is easily formed into various sizes, including tile magnet, magnetic cylinder, magnet block, sphere magnets, horseshoe magnets, can be single magnetization, two poles and multi-poles magnetization, are widely used in mini-motors, wind generators, meters, sensors, sound device, magnetic suspension system, magnetic transmission machine and iatrical apparatus and other applications. It is prone to corrosion in humid environments, usually need surface treatment according to customer's requirements to protect magnet. We can offer the coating included: Zinc, Nickel, Silver, Gold-plating, Passivation, Phosphor,rubber and Spray Epoxy Resin.
Neodymium magnets are the strongest type of permanent magnet currently made. They are amazingly powerful for their size and have innumerable uses. Rare earth magnets are magnets composed of alloys of the Lanthanide group of elements. The two Lanthanide elements most prevalent in the production of permanent magnets are Neodymium and Samarium. There are numerous alloy formulations of rare earth magnets covered under many different patents but the most common commercial varieties are Neodymium-Iron-Boron (NdFeB) and Samarium Cobalt (SmCo).There are two types of neodymium magnets commonly produced commercially: sintered and bonded.
Sintered Magnets
Sintered magnets are made from dry granules of elemental materials which are compacted under pressure in a metal die and then heated at high temperature to fuse the granules together. Sintered rare earth magnets are subjected to a magnetic field during the manufacturing process to orient the magnetic domains in the material. The magnetic orientation of sintered neodymium magnets is fixed during processing and cannot be changed later. This type of magnetic material is known as anisotropic.
The resulting material from the sintering process has similar physical properties to ceramic materials. They are hard and brittle, which makes them inappropriate for applications where they will be subject to shock. Sintered neodymium magnets have the highest energy product of any permanent magnetic material. Because sintered neodymium magnets can provide a strong magnetic field in a small size, they have revolutionized modern electronics allowing for the miniaturization of many electronic components such as motors and speakers. This has led to highly portable electronic devices such as cell phones and tablet computers.
Bonded Magnets
Bonded magnets are made from magnetic metal powder mixed with a polymer. The components are then cast or extruded into a final shape. Bonded magnets can be flexible depending upon what polymer is used in the production. Bonded magnets do not have a fixed magnetic orientation so they can be magnetized in complex patterns with many poles. This type of magnetic material is known as isotropic. Unfortunately, bonded neodymium magnets are much weaker than sintered neodymium magnets, which limits their application.
Magnet Grades and Properties
In addition to their physical characteristics, magnets are most commonly described by their magnetic characteristics. The most widespread classification of magnets is by grade. Grade is a combined identifier of the Maximum Energy Product and the Heat Tolerance of a magnet. To complicate matters more, the Maximum Energy Product is a combined measure of the Residual Flux Density and Coercive Force of a magnet. For the layperson, the Residual Flux Density can be thought of as a measure of magnetic strength. The Coercive Force is a measure of how difficult it is to demagnetize a magnet. Simply put, the higher the Maximum Energy Product, the "stronger" the magnet.
The Heat Tolerance is simply the highest temperature that a magnet can operate at without it permanently losing its magnetism. All magnetic materials will have lower magnetic force as their temperature increases but if you do not exceed their temperature rating they will return to normal as you return the temperature to normal.
The grade of a magnet is expressed as a one or two digit number with letters before or after the number to specify the heat tolerance. Examples:
Grade N35
N - Normal Temperature Grade (Maximum Working Temperature 80 Deg Celsius)
35 - Maximum Energy Product 35 MGOe
Grade 35H
35 - Maximum Energy Product 35 MGOe
H - H Temperature Grade (Maximum Working Temperature 120 Deg Celsius)
Neodymium Magnet Coatings
The composition of neodymium magnets has improved over the years to reduce their susceptibility to oxidation but they are predominately made out of iron and neodymium. Both of these material will oxidize. There are various coatings available to reduce their succeptibility to oxidation. Nickel-Copper-Nickel plating has excellent corrosion resistance and durability as well as providing a clean and shiny appearance. In addition to NiCuNi coating, neodymium magnets can be coated in:
• Nickel (Ni);
• Epoxy;
• Zinc (Zn);
• Gold (Au);
• Silver (Ag);
• Tin (Sn);
• Parylene C;
• Uncoated
Process Flow: Raw Material-----Mixing-----Melting-----Power-----Pressing-----Sintering----Magnetic Testing-----Cutting & Grinding-----Coating-----Inspection-----Packing and shipping.
Grade |
BrmT(kGs) |
HcbkA/m(kOe) |
HcjkA/m(kOe) |
(BH)maxkj/m3(MGOe) |
(Tw) |
N27 |
1030-1080(10.3-10.8) |
≥796(≥10.0) |
≥955(≥12) |
199-231(25-29) |
80℃ |
N30 |
1080-1130(10.8-11.3) |
≥796(≥10.0) |
≥955(≥12) |
223-247(28-31) |
80℃ |
N33 |
1130-1170(11.3-11.7) |
≥836(≥10.5) |
≥955(≥12) |
247-271(31-34) |
80℃ |
N35 |
1170-1220(11.7-12.2) |
≥868(≥10.9) |
≥955(≥12) |
263-287(33-36) |
80℃ |
N38 |
1220-1250(12.2-12.5) |
≥899(≥11.3) |
≥955(≥12) |
287-310(36-39) |
80℃ |
N40 |
1250-1280(12.5-12.8) |
≥907(≥11.4) |
≥955(≥12) |
302-326(38-41) |
80℃ |
N42 |
1280-1320(12.8-13.2) |
≥915(≥11.5) |
≥955(≥12) |
318-342(40-43) |
80℃ |
N45 |
1320-1380(13.2-13.8) |
≥923(≥11.6) |
≥955(≥12) |
342-366(43-46) |
80℃ |
N48 |
1380-1420(13.8-14.2) |
≥923(≥11.6) |
≥876(≥12) |
366-390(46-49) |
80℃ |
N50 |
1400-1450(14.0-14.5) |
≥796(≥10.0) |
≥876(≥12) |
382-406(48-51) |
60℃ |
N52 |
1430-1480(14.3-14.8) |
≥796(≥10.0) |
≥876(≥12) |
398-422(50-53) |
60℃ |
N30M |
1080-1130(10.8-11.3) |
≥796(≥10.0) |
≥1114(≥14) |
223-247(28-31) |
100℃ |
N33M |
1130-1170(11.3-11.7) |
≥836(≥10.5) |
≥1114(≥14) |
247-263(31-33) |
100℃ |
N35M |
1170-1220(11.7-12.2) |
≥868(≥10.9) |
≥1114(≥14) |
263-287(33-36) |
100℃ |
N38M |
1220-1250(12.2-12.5) |
≥899(≥11.3) |
≥1114(≥14) |
287-310(36-39) |
100℃ |
N40M |
1250-1280(12.5-12.8) |
≥923(≥11.6) |
≥1114(≥14) |
302-326(38-41) |
100℃ |
N42M |
1280-1320(12.8-13.2) |
≥955(≥12.0) |
≥1114(≥14) |
318-342(40-43) |
100℃ |
N45M |
1320-1380(13.2-13.8) |
≥995(≥12.5) |
≥1114(≥14) |
342-366(43-46) |
100℃ |
N48M |
1360-1430(13.6-14.3) |
≥1027(≥12.9) |
≥1114(≥14) |
366-390(46-49) |
100℃ |
N50M |
1400-1450(14.0-14.5) |
≥1033(≥1.0) |
≥1114(≥14) |
382-406(48-51) |
100℃ |
N30H |
1080-1130(10.8-11.3) |
≥796(≥10.0) |
≥1353(≥17) |
223-247(28-31) |
120℃ |
N33H |
1130-1170(11.3-11.7) |
≥836(≥10.5) |
≥1353(≥17) |
247-271(31-34) |
120℃ |
N35H |
1170-1220(11.7-12.2) |
≥868(≥10.9) |
≥1353(≥17) |
263-287(33-36) |
120℃ |
N38H |
1220-1250(12.2-12.5) |
≥899(≥11.3) |
≥1353(≥17) |
287-310(36-39) |
120℃ |
N40H |
1250-1280(12.5-12.8) |
≥923(≥11.6) |
≥1353(≥17) |
302-326(38-41) |
120℃ |
N42H |
1280-1320(12.8-13.2) |
≥955(≥12.0) |
≥1353(≥17) |
318-342(40-43) |
120℃ |
N45H |
1300-1360(13-13.6) |
≥963(≥12.1) |
≥1353(≥17) |
326-358(43-46) |
120℃ |
N48H |
1370-1430(13.7-14.3) |
≥995(≥12.5) |
≥1353(≥17) |
366-390(46-49) |
120℃ |
N30SH |
1080-1130(10.8-11.3) |
≥804(≥10.1) |
≥1592(≥20) |
223-247(28-31) |
150℃ |
N33SH |
1130-1170(11.3-11.7) |
≥844(≥10.6) |
≥1592(≥20) |
247-271(31-34) |
150℃ |
N35SH |
1170-1220(11.7-12.2) |
≥876(≥11.0) |
≥1592(≥20) |
263-287(33-36) |
150℃ |
N38SH |
1220-1250(12.2-12.5) |
≥907(≥11.4) |
≥1592(≥20) |
287-310(36-39) |
150℃ |
N40SH |
1240-1280(12.5-12.8) |
≥939(≥11.8) |
≥1592(≥20) |
302-326(38-41) |
150℃ |
N42SH |
1280-1320(12.8-13.2) |
≥987(≥12.4) |
≥1592(≥20) |
318-342(40-43) |
150℃ |
N45SH |
1320-1380(13.2-13.8) |
≥1003(≥12.6) |
≥1592(≥20) |
342-366(43-46) |
150℃ |
N28UH |
1020-1080(10.2-10.8) |
≥764(≥9.6) |
≥1990(≥25) |
207-231(26-29) |
180℃ |
N30UH |
1080-1130(10.8-11.3) |
≥812(≥10.2) |
≥1990(≥25) |
223-247(28-31) |
180℃ |
N33UH |
1130-1170(11.3-11.7) |
≥852(≥10.7) |
≥1990(≥25) |
247-271(31-34) |
180℃ |
N35UH |
1180-1170(11.8-12.2) |
≥860(≥10.8) |
≥1990(≥25) |
263-287(33-36) |
180℃ |
N38UH |
1220-1250(12.2-12.5) |
≥876(≥11.0) |
≥1990(≥25) |
287-310(36-39) |
180℃ |
N40UH |
1240-1280(12.5-12.8) |
≥899(≥11.3) |
≥1990(≥25) |
302-326(38-41) |
180℃ |
N28EH |
1040-1090(10.4-10.9) |
≥780(≥9.8) |
≥2388(≥30) |
207-231(26-29) |
200℃ |
N30EH |
1080-1130(10.8-11.3) |
≥812(≥10.2) |
≥2388(≥30) |
223-247(28-31) |
200℃ |
N33EH |
1130-1170(11.3-11.7) |
≥836(≥10.5) |
≥2388(≥30) |
247-271(31-34) |
200℃ |
N35EH |
1170-1220(11.7-12.2) |
≥876(≥11.0) |
≥2388(≥30) |
263-287(33-36) |
200℃ |
N38EH |
1220-1250(12.2-12.5) |
≥899(≥11.3) |
≥2388(≥30) |
287-310(36-39) |
200℃ |