Rare earth PrNd metal price trend is the vane of neodymium magnet price trend Neodymium magnets contain rare earth elements, iron, boron and other elements. The rare earth elements in the magnets account for 28-35% by weight. As rare earth raw material prices are much higher than those of other raw materials, their cost accounts for 80-98% of the total raw material cost. Especially affected by the rising market of rare earth raw materials since 2021, as of the time… Read More
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A permanent magnet’s magnetic properties change as a variation of temperature. For a permanent magnet, remanence (Br) and intrinsic coercivity (Hcj or Hci) are two major parameters, it is important to consider their changes with corresponding temperature variation at work. In order to describe the relative changes, they are calculated according to the following two formulas: α = [Br(T1)-Br(T2)]/Br(T1)/[ T1-T2]×100 (1) β = [Hcj(T1)-Hcj(T2)]/Hcj(T1)/[T1-T2]×100 … Read More
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Researchers and engineers have never stopped their steps to discover and develop novel permanent magnets since 1910s, and several types of permanent magnets had been commercialized and they have been widely used in motion, energy, electronics, medical and other high technologies in our daily life. However, little breakthrough has been taken in the past 18 years of the 21st century. In the current market, almost all types of commercial permanent magnets (ferrite, NdFeB, SmCo and AlNiCo, etc.) were discovered and… Read More
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The basic way to magnetize a magnet is using a coil, i.e. an electromagnet, to generate a magnetic field. The generated magnetic field increases as the charging current increases, it drives micro magnetic domains of a magnet rotate to the magnetization direction. When all the micro magnetic domains aligned along the same direction, the magnet is magnetized to the saturation state. Demagnetizing a magnet is the opposite process of magnetizing a magnet as described above. Just alternative the charging current… Read More
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Actually permanent magnets are not permanent. A Permanent Magnet is a material which has ability to resist demagnetization, including filed demagnetization and thermal demagnetization. The ability is characterized by a physical parameter called coercivity. In regard to field demagnetization, if a demagnetizing field or reverse field is smaller than a permanent magnet’s coercivity, the permanent magnet will keep the same magnetic flux (the demagnetizing process is linear and reversible when the demagnetizing field is lower than a threshold value) or… Read More
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Radially oriented neodymium iron boron (NdFeB) ring magnets are state-of-the-art ring magnets with diverse magnetization patterns in radial direction. In general, they provide high performance and cost-effective alternatives to arc/segment magnets. According to different production processes, radially oriented NdFeB ring magnets include sintered NdFeB ring magnets, bonded NdFeB ring magnets and hot-pressed NdFeB ring magnets. single pole radially ring magnet multi-pole radially ring magnet (straight) multi-pole radially ring magnet (skew)
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In the Rare Earth Permanent Magnets family, the 1st generation 1:5 type SmCo magnets and 2nd generation 2:17 type SmCo magnets have high corrosion resistance due to the high cobalt content. Just like ferrite/ceramic magnets and AlNiCo magnets, SmCo magnets usually do not need any treatment for applications. The 3rd generation NdFeB magnets, however, are not the same. Although they have superior magnetic properties, they are more vulnerable to corrosion in humid environments, resulting in the deterioration of magnetic properties… Read More
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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 value varies from 2 to 12. In a few… Read More
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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 REPMs. Compared with other types of permanent… Read More
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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 the working temperature in various… Read More
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