The magnet heats up in the fire and disappears. This is because the magnet has magnetic properties. Because the free electron movement inside it has a certain directionality, the magnet is magnetic, and the direction of motion of the internal electrons after heating is lost and the directionality is lost. Therefore, the magnetic disappearance weakens the demand for "magnetization", that is, the magnetic object to be magnetized is placed in a magnetic field formed by a coil through which direct current is passed.

The magnetization direction can be divided into thickness magnetization, radial magnetization, and the like.

A constant current magnetizer

Operating principle: The constant current of the DC current in the coil causes the coil to stabilize the magnetic field. Suitable for magnetization of low coercivity permanent magnet materials.

2. Pulse magnetizing machine

Operation principle: The super-strong magnetic field with short coil attack time is caused by the instantaneous large pulse current in the coil. Suitable for high coercivity permanent magnet materials or messy multipole magnetization. It is widely used in the production and operation of permanent magnet materials. It is suitable for the magnetization of various permanent magnet material parts and components, such as: aluminum-nickel-cobalt series, ferrite series, rare earth permanent magnet series, etc., with high efficiency and reliability. The equipment has no special requirements for the power supply of the workplace, and it is convenient to use.

How to recover from high temperature resistant magnet after demagnetization

Ferromagnetic is an orderly condition.

The high temperature tends to be disordered, and the natural magnetic function will decrease.

If the temperature is higher, the ferromagnetic coupling between the magnetic moments is gone, and the magnetism is gone.

One. Make sure that the high temperature does not exceed the Curie temperature of the magnet. Each functioning magnet has its own corresponding Curie temperature. If the Curie temperature is exceeded, it will not be magnetically permanent. It is only necessary to go back to the furnace to make the process from scratch.

two. Magnetization is the need to magnetize under high pressure, that is, the external high-field magnetic field of the attack, generally the magnetization voltage is about 2000V.

three. Any magnet will demagnetize when the temperature is high at 300 °C, so the magnet will not work properly.