How to Understand the Grade of Sintered SmCo Magnet?

How to Understand the Grade of Sintered SmCo Magnet? Samarium cobalt (SmCo) magnets include 1:5 type (SmCo5) and 2:17 type (Sm2Co17) magnets. For both of sintered SmCo5 and Sm2Co17 magnets, their grades basically include three parts, i.e. “letter 1” + “number” + “letter 2”. Similar to sintered NdFeB magnets, the three parts in sintered SmCo magnets’ grades also present material type, (BH)max value (in CGS unit) and Hcj level, respectively. The difference is that the left part “letter 1” are… Read More

Continue Reading

How to Understand the Grade of Bonded NdFeB Magnet?

How to Understand the Grade of Bonded NdFeB Magnet? Unlike sintered NdFeB magnets having extensive recognition of the uniform grades in the global market, the grades of bonded NdFeB magnets are mainly based on the technology and standard of each manufacturer itself. For our company, the grades of bonded NdFeB magnets mostly include two parts, i.e. “HGT-“ + “number”. The left part “HGT” is our company’s short name. The right part “number” represents value of (BH)max (in CGS unit). The… Read More

Continue Reading

How to Understand the Grade of Sintered NdFeB Magnet?

How to Understand the Grade of Sintered NdFeB Magnet? Generally, the grades of sintered neodymium iron boron (NdFeB) magnets are strings containing three parts, i.e. “N” + “number” + “letter”. The left part “N” is the initial letter of neodymium, meaning it is sintered NdFeB magnet. So it is constant for all the grades. The middle part “number” represents value of maximum energy product (BH)max (in CGS unit). The value varies from 28 to 52. The right part “letter” reflects… Read More

Continue Reading

What are Rare Earth Permanent Magnets (REPMs)?

What are Rare Earth Permanent Magnets (REPMs)? Rare earth permanent magnets (REPMs) are permanent magnets which are based on some rare earth elements (Sm, Nd, Pr, Dy, Ce, etc.) to form critical magnetic structures. In regard to crystal structures, REPMs include a. 1:5 type SmCo magnets (hexagonal CaCu5 type structure) also called 1st generation REPMs, b. 2:17 type SmCo magnets (rhombohedral Th2Zn17 type structure) also called 2nd generation REPMs and c. Nd2Fe14B magnets (tetragonal crystal structure) also called 3rd generation… Read More

Continue Reading

What is a Permanent Magnet?

What is a Permanent Magnet? A permanent magnet is a material that is able to provide magnetic flux when magnetized with an applied magnetic field. The ability is characterized by two key parameters: remanence and coercivity. Generally, a permanent magnet’s intrinsic coercivity (Hcj) is higher than 300kOe (in CGS unit) or 24kA/m (in SI unit). With higher coervivity, a permanent magnet has higher ability to resist demagnetization, including field demagnetization from the electric or magnetic circuit and thermal demagnetization from… Read More

Continue Reading