Permalloy core current sensor

Permalloy is an iron nickel alloy with high magnetic guidance and low -correction. It is widely used in magnetic materials and electrical elements, such as transformers, transformers, relays, etc. The thermal treatment of the permalloy iron core has a significant impact on its magnetic performance. The following is the specific impact of the thermal treatment system on the performance of the permalloy iron core:   1. Hot treatment temperature   Antuction temperature: Poomo alloy is usually annealing at about 1000 ° C. Excessive or too low annealing temperature will affect the magnetic properties of the iron core. The high annealing temperature can reduce the internal stress, eliminate the cold processing hardening effect, thereby increasing the magnetic guidance and reducing the stubborn force. However, excessive temperature may cause the grain to grow excessively and reduce the magnetic performance of the material.   Antuction time: The appropriate annealing time can ensure fully eliminating the internal stress and forming a uniform micro -tissue. For a long time, it may cause grain to ricate.   2. Cooling speed   Slow cooling: Generally, slow cooling methods, especially in hydrogen or vacuum environments to avoid the introduction of oxidation and internal stress. Slow cold helps to obtain higher magnetic guidance and lower stubborn power.   Fast cooling: Fast cooling may lead to high internal stress, thereby increasing stubborn force and reducing magnetic guidance.     3. Hot treatment atmosphere   Vacuum or hydrogen protection: In order to prevent slope alloys from oxidizing at high temperature, heat treatment is usually performed in the atmosphere of vacuum or hydrogen protection. This helps maintain the purity of the alloy, prevent the formation of oxides, and maintains excellent magnetic properties.   Oxidation atmosphere: If it is treated under the oxidation atmosphere, the surface is prone to form oxides to reduce magnetic performance.   4. Magnetic Antuction   Plus magnetic field: Applying a certain magnetic field (usually called a magnetic field annealing) during thermal treatment can further improve the magnetic properties of the Somo alloy. This process can make magnetic domain arrangement, thereby increasing magnetic guidance and reducing stubborn force.   5. Stress elimination   Stress annealing: During the cold rolling process, the Spoomo alloy may introduce large internal stress, which will affect the magnetic performance of the iron core. Through stress annealing, the internal stress can be significantly reduced, and the magnetic guidance and stability can be improved.   6. Grane size control   Fine grains: Appropriate heat treatment can refine the grains, and small grains help reduce the stubborn force and improve the magnetic guidance.   Gravate grows: an annealing of too long or too high temperature can cause grains to grow, but reduce magnetic performance.