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Ningbo Dongsheng Strong Magnet Material Co.,Ltd.
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Product (141)
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Ningbo Dongsheng Strong Magnet Material Co.,Ltd. [China (Mainland)]
Business Type:Manufacturer
City: Ningbo
Province/State: Zhejiang
Country/Region: China (Mainland)
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FAQ
Frequently Asked Questions about Neodymium Magnets
Neodymium magnets are composed of Neodymium (Nd), Iron (Fe), Boron (B) and a few transition metals.
2. How are Neodymium magnets produced?
Neodymium, Iron, Boron and a few transition metals will be made into the NdFeB powder, then fine NdFeB powder will be compacted in a die and sintered, fusing thepowder into a solid material. There are 2 forms of pressing: die pressing and isostatic pressing. Sintered parts normally need some finish machining in order to meet final tolerances.
3.Are Neodymium magnets and rare earth magnets the same thing?
Rare earth magnets are made from rare earth elements found on the periodic table, Neodymium magnets are a member of the rare earth magnets family, they are called "rare earth" because the neodymium element is a member of the "rare earth" elements. At present, Neodymium magnets are the strongest of the rare earth magnets and also are the strongest permanent magnets in the world.
4. Is one pole stronger than the other?
No, the North pole and the South pole are equally strong.
5. Which magnet is the strongest magnet?
Neodymium magnets are the strongest permanent magnets in the world.
6. What materials can magnets attract?
Ferromagnetic materials are strongly attracted by a magnetic force.The elements iron (Fe), nickel (Ni), and cobalt (Co) are the most commonly available elements. Steel is ferromagnetic because it is an alloy of iron and other metals.
7. Can you supply monopole magnets?
No, we don't, actually nor does anyone else, because the monopole magnets don't exist, all magnets must have at least two poles.
8. How can I identify the N pole and S pole of a magnet?
There are several simple methods can be used to identify the North and South poles of neodymium magnets.
(1) The easiest way is to use another magnet which is already marked with N pole and S pole, the North pole of the marked magnet will be attracted to the South pole of the unmarked magnet, the South pole of the marked magnet will be attracted to the North pole of the unmarked magnet.
(2) You can use the Pole Identifier Device to identify the N pole and S pole of a magnet.
9. Does stacking magnets make them stronger?
Yes, two or more magnets stacked together will behave exactly like a single magnet of the combined size. For example, if you stacked two of 1/2" dia. x 1/8" thick disc magnets to form a 1/2"dia. x 1/4" thick combined size, the two magnets would have the same strength and behave identically to the 1/2" dia. x 1/4" thick disc magnets.
10. What does "Magnetized thru thickness" mean?
Block Neodymium magnets are defined by three dimensions: Length, Width and Thickness, the thickness is always the last dimension listed for block magnets.When a block magnet is magnetized through thickness, that is to say, the N pole will on one "Length X Width" face and the S pole will on the other "Length X Width" face.
11. What materials can I use to shield magnetic fields?
Magnetic fields can only be redirected, the materials of ferromagnetic (attracted to magnets) can be used to redirect magnetic fields, such as iron, steel (which contains iron), cobalt, and nickel. The degree of redirection is proportional to the permeability of the material. The most efficient shielding material is the 80 Nickel family, followed by the 50 Nickel family.
12. How is the strength of a magnet measured?
Yes, two or more magnets stacked together will behave exactly like a single magnet of the combined size. For example, if you stacked two of 1/2" dia. x 1/8" thick disc magnets to form a 1/2"dia. x 1/4" thick combined size, the two magnets would have the same strength and behave identically to the 1/2" dia. x 1/4" thick disc magnets.
10. What does "Magnetized thru thickness" mean?
Block Neodymium magnets are defined by three dimensions: Length, Width and Thickness, the thickness is always the last dimension listed for block magnets.When a block magnet is magnetized through thickness, that is to say, the N pole will on one "Length X Width" face and the S pole will on the other "Length X Width" face.
11. What materials can I use to shield magnetic fields?
Magnetic fields can only be redirected, the materials of ferromagnetic (attracted to magnets) can be used to redirect magnetic fields, such as iron, steel (which contains iron), cobalt, and nickel. The degree of redirection is proportional to the permeability of the material. The most efficient shielding material is the 80 Nickel family, followed by the 50 Nickel family.
12. How is the strength of a magnet measured?
Gaussmeters are used to measure the magnetic field density at the surface of the magnet. This is referred to as the surface field and is measured in Gauss (or Tesla).Pull Force Testers are used to test the holding force of a magnet that is in contact with a flat steel plate. Pull forces are measured in pounds (or kilograms).
13. What does the N35, N40, N42, N45, N48, N50, N52 grade mean?
Neodymium magnets are graded by the maximum strength they can be magnetized to. The higher the number the stronger the magnet is, however the higher the number the more brittle the magnet becomes as well.
14. Can I cut, drill, or machine neodymium magnets?
The Neodymium Iron Boron material is very hard and brittle, so machining is difficult at best. The hardness of the material is RC46 on the Rockwell "C" scale, which is harder than commercially available drills and tooling, so these tools will heat up and become damaged if used on Neodymium Iron Boron material, therefore the machining of neodymium magnets should only be done by experienced machinists familiar with the risk and safety issues involved. The heat generated during machining can demagnetize the magnet and could cause it to catch fire posing a safety risk. The dry powder produced while machining is also very flammable and great care must be taken to avoid combustion of this material.
17. Will the neodymium magnets lose strength over time?
Very little. Neodymium magnets are the strongest and most permanent magnets, if they are not overheated or physically damaged, neodymium magnets will lose less than 1% of their strength over 10 years, you will not even notice unless you have very sensitive measuring equipment.
18. Will neodymium magnets lose strength if they are held in repelling or attracting positions for a long time?
In most applications, the answer is simply "no". But if the magnets will be exposed to higher temperatures while in repelling applications, the answer is "possibly".
19. Are your Neodymium Rare Earth Magnets RoHS compliant?
Yes, our magnets are fully RoHS compliant, meeting the European Parliament Directive entitled "Restrictions on the use Of Hazardous Substances" (RoHS).
13. What does the N35, N40, N42, N45, N48, N50, N52 grade mean?
Neodymium magnets are graded by the maximum strength they can be magnetized to. The higher the number the stronger the magnet is, however the higher the number the more brittle the magnet becomes as well.
14. Can I cut, drill, or machine neodymium magnets?
The Neodymium Iron Boron material is very hard and brittle, so machining is difficult at best. The hardness of the material is RC46 on the Rockwell "C" scale, which is harder than commercially available drills and tooling, so these tools will heat up and become damaged if used on Neodymium Iron Boron material, therefore the machining of neodymium magnets should only be done by experienced machinists familiar with the risk and safety issues involved. The heat generated during machining can demagnetize the magnet and could cause it to catch fire posing a safety risk. The dry powder produced while machining is also very flammable and great care must be taken to avoid combustion of this material.
15. Can I solder or weld to neodymium magnets?
No, you cannot solder or weld to neodymium magnets, because the heat will demagnetize the magnet and could cause it to catch fire posing a safety risk.
16. Do I need to worry about temperature with neodymium magnets?
Yes. Neodymium magnets are sensitive to heat. Taking the standard N grade magnet as an example, if the N grade magnet is heated above its maximum operating temperature 176°F (80°C), the magnet will permanently lose a fraction of its magnetic strength; if the N grade magnet is heated above its Curie temperature 590°F (310°C) , it will lose all of its magnetic properties.
Different grades of neodymium magnets have different maximum operating and Curie temperatures, please see our "Neodymium Magnet Info" page for more details.
16. Do I need to worry about temperature with neodymium magnets?
Yes. Neodymium magnets are sensitive to heat. Taking the standard N grade magnet as an example, if the N grade magnet is heated above its maximum operating temperature 176°F (80°C), the magnet will permanently lose a fraction of its magnetic strength; if the N grade magnet is heated above its Curie temperature 590°F (310°C) , it will lose all of its magnetic properties.
Different grades of neodymium magnets have different maximum operating and Curie temperatures, please see our "Neodymium Magnet Info" page for more details.
17. Will the neodymium magnets lose strength over time?
Very little. Neodymium magnets are the strongest and most permanent magnets, if they are not overheated or physically damaged, neodymium magnets will lose less than 1% of their strength over 10 years, you will not even notice unless you have very sensitive measuring equipment.
18. Will neodymium magnets lose strength if they are held in repelling or attracting positions for a long time?
In most applications, the answer is simply "no". But if the magnets will be exposed to higher temperatures while in repelling applications, the answer is "possibly".
19. Are your Neodymium Rare Earth Magnets RoHS compliant?
Yes, our magnets are fully RoHS compliant, meeting the European Parliament Directive entitled "Restrictions on the use Of Hazardous Substances" (RoHS).
20. Why are most neodymium magnets plated or coated?
Neodymium magnets are composed mainly of Neodymium, Iron, and Boron, if neodymium magnets are not plated, the iron in the material will oxidize very easily if the Neodymium magnet is exposed to moisture, even normal humidity will rust the iron over time. Therefore in order to protect the iron from exposure to moisture, most neodymium magnets are plated or coated.
