Is the magnet still magnetic after it is burned red, and why is it that once the magnet is burned re

Experiments have shown that after the magnet burns red, it loses its magnetic properties. What is the rationale for this?

In order to explain this truth clearly, we must first know, why are ferromagnetic materials magnetic?

In terms of material composition, all matter is composed of its molecules. Molecules, in turn, are made up of atoms. Atoms, in turn, are made up of nuclei and electrons, and electrons are constantly rotating and revolving around the nucleus, and these two movements of electrons produce magnetism.

However, due to the different directions of their movement, they are chaotic, so that the magnetic effects inside the matter cancel each other out. Therefore, matter is not magnetic under normal circumstances.

However, under the action of the magnetic field of the outside world, the electrons that were originally moving inside the iron, nickel, and cobalt ferromagnetic materials were heard one by one like well-trained warriors"Standing - Aligning to the right"At this time, the magnetic effect produced by the rotational motion of electrons is consistent with the direction of the external magnetic field, and these substances appear magnetic. The electrons in non-ferromagnetic materials such as copper, aluminum, and lead, despite the strong magnetic field, are like a group of disobedient naughty children who refuse to listen"Password"While"Lined up neatly", still moving freely and freely, so there is no magnetism.

The reason why the magnet can attract the nail is because when the magnet with magnetism is close to the nail, the magnetic field of the magnet magnetizes the nail and attracts each other, and the nail is firmly connected to the magnet"Sticky"Together.

However, as the temperature of magnets and magnets increases, the thermal movement of molecules inside them becomes faster and faster. As a result, more and more electrons refused to listen"Queue up"of"Password"Finish. When the temperature rises to a certain value, the violent molecular thermal motion finally completely destroys the regularity of the direction of the electron motion, and the magnetism of the magnet disappears.

Metallurgists refer to the temperature at which magnets and magnets completely lose their magnetism"Curie temperature"。The Curie temperature of steel is 770.

Now, you should know why a red-hot magnet can't attract iron nails. Because of the red-hot magnet, the general temperature has exceeded 800. Of course, if we re-magnetize the magnet after the temperature drops, it will still be able to re-magnetize"work"Get up.

No, the high temperature destroys the order of the molecular current in the magnet, resulting in a loss of magnetism.

No, because when it burns red, the magnet becomes something else.

The chemical composition of the magnet is ferric oxide.

When heated, it reacts chemically with oxygen in the air.

No. Magnets have the property of demagnetization at high temperatures.

There is no magnetism, and to tell you, the magnet will not burn red.

A magnet is magnetic because it is neatly arranged with many "magnetic domains" (domains are regions inside the material that have uniform magnetization, in which the direction of the magnetic moment of the atoms is the same). When something ferrous is close to a magnet, it is magnetized by the magnetic field of the magnet and is firmly attached to the magnet.

However, the magnetic domains inside the magnet are not immutable. As the temperature increases, the molecular thermal motion inside the magnet intensifies, and the direction of the magnetic domains may become irregular and gradually tend to be disordered, which will lead to the gradual weakening or even loss of magnetism.

Scientific research has found that when the magnet is burned red and its temperature rises to a certain value, the violent molecular thermal movement inside the magnet will cause the magnetic domain to be completely disordered, and the magnet will lose its magnetism. Scientists call the temperature at which the magnetism of a magnet disappears completely as the "Curie temperature". Studies have proven that the Curie temperature of a magnet is 769.

When the magnet is burned red, the temperature of the magnet has exceeded 800, which is much higher than the Curie temperature of the magnet, so the red-hot magnet will lose its magnetism. In addition, when the temperature of the magnet drops, re-magnetize the magnet and the magnet will regain its magnetism.

Heating and forging are two methods of degaussing.

There should be no pulling.

At the end of the 19th century, the famous physicist Pierre Curie (Marie Curie's husband) discovered in his laboratory that one of the physical properties of magnets is that when the magnet is heated to a certain temperature, the original magnetic properties will disappear. Later, people called this temperature the "Curie point".

When the temperature reaches enough to destroy the neat arrangement of the magnetic moment of the magnetic domain, the magnetic domain is disintegrated, the average magnetic moment becomes zero, the magnetic property of the ferromagnetic material disappears and becomes a paramagnetic substance, and a series of ferromagnetic properties associated with the magnetic domain (such as high permeability, hysteresis loop, magnetostriction, etc.) all disappear, and the permeability of the corresponding ferromagnetic material is converted into the magnetic permeability of the paramagnetic substance. The temperature corresponding to the disappearance of ferromagnetism is the Curie point temperature.

Strictly speaking, the general "high temperature" does not reach the level of rearranging the atoms in the magnet, and the high temperature changes the "phase" of the magnet.

"Phase" can be understood as a state of matter, and what we often call solid, liquid, and gaseous states is a large classification, and the phase transition between these three is called a first-order phase transition. There are also small classifications under the three, and the transition between the various "small phases" under a large category is called the second-order phase transition.

The essence of the high-temperature demagnetization phenomenon of a magnet is that the second-order phase transition from ferromagnetic to paramagnetic occurs inside the magnet.

Magnets all have a Curie temperature, and different magnetic materials have different Curie temperatures. If the temperature reaches the Curie temperature of the magnet, then the surface remanence will recede. Generally, the Curie temperature of N grade is 80 degrees Celsius, and the Curie temperature of M grade is 100 degrees Celsius.

The Curie temperature is 120 degrees Celsius for H grades, 150 degrees Celsius for SH grades, and 180 degrees Celsius for UH grades. The Curie temperature for EH grades is 80 degrees Celsius.

Ampere believes that the magnetism of magnetic materials comes from the molecular current in them, and usually the magnet we use is magnetized iron, which temporarily has a more stable molecular current, and it has magnetism. When heated, the thermal motion of the molecule accelerates, which disrupts the orderly molecular current, causing it to lose its magnetic properties.

What you said is pretty much the same, it is important to understand why magnets are magnetic, the main thing is the peculiarity of the electron layer arrangement of iron (most of the electrons in the magnet rotate in the same direction around the atoms, so that each electron produces a magnetic field, macroscopically it is the magnetic field produced by the magnet) causes magnetization and can ensure magnetism. When the magnet is heated, the electrons run in the opposite direction or are arranged in a disorderly manner, so the magnetism fades.

Magnets are magnetic because there are many magnetic domains in the same direction neatly arranged inside the magnet, and when the temperature of the magnet is too high, the magnet will lose its magnetism.

When a magnet is heated to the highest heat-resistant temperature, the so-called Curie temperature, the magnetic field inside the magnet is affected by the surrounding magnetic field and changes to lose its magnetism and inability to hold the iron.

Because the order of the original atoms in it is disrupted by high temperatures, it loses a certain amount of magnetism, and it is very difficult to return to its original appearance.

The magnetic molecular structure of the magnet is destroyed by heating, so it cannot absorb iron.

When the magnet burns red and the temperature rises to a certain value, the violent molecular thermal motion causes the magnetic domains to return to a completely disordered state, and the magnet completely loses its magnetism.

Because: when the temperature is high, the magnetism of the magnet disappears.

Magnets lose their magnetism after certain extreme environments, such as high temperature heating and violent collisions, and this method is also used scientifically for demagnetization.

When a magnetic magnet is close to the nail, the magnetic field of the magnet magnetizes the nail, causing attraction to each other, and the nail is firmly attached to the magnet"Sticky"Together.

The molecular atoms inside are originally arranged in an orderly manner, but the increase in temperature makes the molecular atoms more active, so the magnetic force decreases.

The reason for this is that, due to the different and chaotic directions of their movement, the magnetic effects inside the matter cancel each other out.

Magnets are magnetic because there are many magnetic domains in the same direction neatly arranged inside the magnet.

Because the magnetism of the red-hot magnet disappears, it cannot be absorbed, and if it is magnetized, it can be re-absorbed.

This magnetism must have disappeared after it burned red, so it couldn't absorb iron.

After the iron is burned red, the magnetic domains are destroyed and hungry and have no magnetism.

The high temperature short-sighted loses its magnetism,

From ferric oxide to ferric oxide, the internal magnetic domains are destroyed, and the magnetic domain is because the magnetic domain arrangement is consistent, and the base code grinding hot mold destroys this arrangement, and then it is necessary to fight from the atomic side.

Because iron is equivalent to being melted by the sun.