Euke MagTech Limited is specialized in manufacturing neodymium magnet and Samarium Cobalt magnet. Professional technology team is our strong support for our production , scientific management and superior service make us obtain more customers.
How to choose material and grade
NdFeb magnet and SmCo magnet are divided into many grades, you could learn Br. Hcb, BHmax. , Max. Working temperature and so on.
Working temperature is very important, the stability of magnetism is closely related to.
Within Operating temperature range, the magnetic force will be correspondingly weakening when the working temperature rise 1 ℃. Basically, the magnetism can be restored to the original level after cooling, if the working temperature exceed the max. working temperature of magnet , the magnet will slowly demagnetized, and magnetic properties can not be recovered.
Motor manufacturers, wind turbine manufacturers, components manufacturers prefer to choose H series , SH series and other high grade as raw material, because of the strong magnetism and high temperature resistance. For example, the max. working temperature of N42H is 120℃, if the environment working temperature is just 120℃, we suggest that N42SH as material , the N42SH can stand 150℃. The demagnetization is related with size, if the size is small, the N42H magnet may begin to demagnetize at 110℃.
The SINTERED NDFEB MAGNET can withstand highest working temperature about 220℃,this working temperature is unable to meet the requirement of other application. So, some users choose SmCo as material, the Sm2Co17 max. working temperature can be 350℃, and the properties keep stable under high working temperature, so the Samarium Cobalt magnet is very popular among users.
Choosing of material and grade need consider many factors, such as Hcj, BHmax. , hardness, brittleness and so on.
The property following is for reference, may is helpful for you.
| Item | Unit | Neodymium | Neo with high working temperature | Samarium Cobalt | Ferrite | Alnico |
| residual magnetic flux density | T | 1.26 | 1.23 | 1.03 | 0.385 | 1.25 |
| coercive force (Hcb) | KA/m | 859 | 923 | 640 | 230 | 47.7 |
| intrinsic coercive force (Hcj) | KA/m | 955 | 1592 | 1190 | 235 | 47.7 |
| BH(max) | J/m3 | 260 | 287 | 140 | 27.9 | 38.2 |
| density | g/cm3 | 7.3～7.5 | 7.3～7.5 | 8.3 | 4.8～5.0 | 7.3～7.4 |
| Working temperature | ℃ | 80 | 150 | 250-350 | 80 | 400-550 |
| Curie temperature | ℃ | 310 | 340～400 | 710 | 450～460 | 850 |
| Vickers hardness | HV | 500～600 | 500～600 | 600 | 480～580 | 650 |
About Customer Complaints
Product quality issues, customers can contact Sales Department, the sales will provide the《Customer feedback form》for customer to fill out, the sales submit it to the Quality Department and Technical Department to analyze the causes and provide solutions, and then the sales communicate with customers and obtain customer satisfaction.
Working Chart
Frequently Asked Questions
1.How to pack the powerful strength of Magnets to ship safely by air ?
Magnet isolation packing for air transportation, powerful neodymium magnets need to be demagnetized by specialized agencies .The so-called demagnetization doesn’t mean the disappearance of magnetic force, but mean to have a perfect package to protect the magnetic strength to meet the safe transport.
We will make magnetic isolation packing for air transportation. we usually pack them with iron sheets and foam. So they don’t affect flights. For unmagnetized magnet, there is no magnetic force, so it's just like normal goods.
2.It is know that rare earth magnets can stand high working temperature, but what are the maximum operating temperatures for different materials?
The working temperatures are different based on the different materials. Please select the very material working temperature that you need:
Material
|
Maximum Operating
| |
Temperatures
| ||
℃
|
℉
| |
NdFeB
|
200
|
284
|
SmCo
|
300
|
572
|
Ferrite
|
300
|
572
|
Alnico
|
100
|
212
|
If you have magnet need, contact us at sale@cmsmagnets.com
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