NdFeB neodymium permanent magnet material is a permanent magnet material based on the intermetallic compound Nd2Fe14B. NdFeB has a very high magnetic energy product and coercive force, and can absorb a weight equivalent to 640 times its own weight. The advantages of high energy density make NdFeB permanent magnet materials widely used in modern industrial and electronic technologies, making it possible to reduce the size, weight, and thickness of instruments, electroacoustic motors, and magnetic separation magnetization.
The advantage of Everbbeen NdFeB Magnet is that it has high performance and price ratio, good mechanical properties and easy cutting. The disadvantage is that the Curie temperature is low, the temperature characteristics are poor, and it is easy to be pulverized and corroded. It must be adjusted by its chemical composition and Surface treatment methods are used to improve it to meet the requirements of practical applications.
The Everbbeen magnet NdFeB is manufactured by powder metallurgy process, and the raw materials containing certain proportions such as ruthenium, osmium, iron, cobalt, ruthenium, osmium, aluminum, boron iron, etc. are smelted into alloy steel ingots by medium frequency induction melting furnace, and then broken. The powder of 3 to 5 μm is prepared and pressed into a magnetic field, and the formed green body is sintered in a vacuum sintering furnace to be dense and tempered, thereby obtaining a permanent magnet blank having a certain magnetic property. After the blank is subjected to grinding, drilling, slicing and other processing steps, the finished product of NdFeB is obtained by surface treatment.
The parameters of the magnetic material of the Everbbeen NdFeB magnet are: 1. Magnetic energy product (BH): Definition: The product of the magnetic flux density (B) and the corresponding magnetic field strength (H) at any point of the demagnetization curve of the permanent magnet. It is a parameter that characterizes the total stored energy in a magnetic field generated by a unit volume of a permanent magnet material. Unit: Mega High O (MGOe) or Coke / Meter 3 (J/m3)
Brief Description: The product of B and H at any point on the demagnetization curve, that is, BH, is called the magnetic energy product, and the maximum value of B×H is called the maximum energy product, which is the D point on the demagnetization curve. The magnetic energy product is one of the important parameters to measure the amount of energy stored in the magnet. A magnet corresponding to a certain energy when the magnet is used requires the volume of the magnet to be as small as possible.
Everbbeen magnet manufacturer 2. Remanence magnet Br: Definition: Magnetization of the ferromagnetic material to remove the magnetic field remaining on the magnetized ferromagnet.
3. Coercivity (Hcb, Hcj)
Hcj (inner coercivity) reduces the magnetization of the magnet to zero. The reverse magnetic field strength that is required to be applied is called intrinsic coercivity. The intrinsic coercivity is a physical quantity that measures the anti-demagnetization ability of a magnet and is a coercive force indicating that the magnetization M in the material retreats to zero. In the use of the magnet, the higher the coercive force of the magnet, the better the temperature stability.
When the Everbbeen magnet Hcb (magnetic coercive force) applies a reverse magnetic field to the magnetic material, the value of the reverse magnetic field strength required to reduce the magnetic induction intensity to zero is called the magnetic induction coercive force (Hcb). However, the magnetization of the magnet is not zero at this time, but the applied reverse magnetic field and the magnetization of the magnet cancel each other out. (The external magnetic induction performance is zero.) At this time, if the external magnetic field is removed, the magnet still has a certain magnetic property.
4. Temperature coefficient remanent reversible temperature coefficient αBr: When the working environment temperature rises from room temperature T0 to temperature T1, the residual magnetic Br of neodymium iron boron also decreases from B0 to B1; when the ambient temperature returns to room temperature, Br cannot recover. To B0, but only to B0'. Thereafter, when the ambient temperature changes between T0 and T1 (assuming that the amount of change is not large), the change in Br is linearly reversible. The reversible temperature coefficient αBr is: · Similarly, we can get the temperature coefficient βHcj of the intrinsic coercive force Hcj as follows: The temperature coefficient α and β are only the reversible change of magnetic properties, that is, the recovery temperature. Restore magnetic performance.