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Latest magnet industrial knowledge

Latest magnet industrial knowledge

2020-09-25


magnet

Magnet has become a must for many devices and equipments' manufacturing to raise their performance. Today, China magnet manufacturer, Zhongke Magnetic Industry Co.,Ltd. brings you latest industrial magnet knowledge. 


Why do magnets repel and attract each end? Where does the energy of magnet come from?

Every magnet has two sides: a north pole and a south pole. We use these names because if you hang a magnet on the wire, the north pole of the magnet (almost) points north.

This is because the core of the earth is also a large and weak magnet. Our small but strong magnet is aligned with the core of the earth, so it points north. This is how the compass works.


The magnetic field of the magnet!

If you take the two magnets upside down, they will be pushed away-they will repel each other! In other words, if you connect two magnets together, make similar two poles close together (two north poles or Two Antarctica), they will repel each other.

It feels like the magnet is surrounded by an invisible rubber layer, separating them. This invisible layer is called the magnetic field.

Only when you hold different magnetic poles together (the north pole points to the south pole) will the magnets stick together (they are attracted). Now, the magnetic field pulls the magnets together like a stretched rubber band to recover.



               

So why do magnets attract or repel?

We all know that creating movement requires energy. When the gasoline in the car burns, the stationary car will start to move. This is because gasoline contains stored energy, which is released when burned.

When this stored energy is released, some of it will be converted into motion energy. Scientists call this stored energy "potential energy" and motion energy "kinetic energy".

When you start running, it is because the energy stored in the food is released and some of it is converted into exercise energy. What does this have to do with magnets? The magnetic field surrounding the magnet contains stored energy. But we can change the energy stored around the magnet. This will determine in which direction the magnet will move.

Everything in the universe has laws, and magnets are no exception. This is definitely not complicated mathematics. It is difficult to explain why the universe follows this rule, but this is how the universe works.

The rule is: As long as there is stored energy in an object (provided that the object is not tied or stuck somewhere), then the object will be pushed in the direction that causes the stored energy to decrease. The stored energy will be reduced and replaced by sports energy.

Therefore, if the magnetic poles of two magnets point in different directions (the north pole points to the south pole), then moving them closer together will reduce the energy stored in their magnetic fields, which is the attraction. If the magnetic poles of two magnets are the same (the south pole points to the south pole or the north pole points to the north pole), then if they separate, the stored energy will be reduced, which is the repulsive force.

What Zhongke magnet factory wants to say here is that when falling objects are attracted by the earth and fall, it is not due to magnetism. This is because of gravity. The earth is also surrounded by a gravitational field, and energy is also stored in the gravitational field.


What happens when the magnet melts? This phenomenon has been well utilized by modern technology

As long as the temperature is sufficient, all metals will melt. The melting point of iron is 1538 degrees Celsius, at which temperature iron will become liquid. The silver-white pure iron is very beautiful, but the black magnet is definitely not a magical thing.

In our daily life, there are many kinds of magnets, such as neodymium iron boron magnets, alnico magnets, ferrite magnets, etc., but these magnets are usually industrial products.

Natural magnets usually refer to Fe3O4 (Fe3O4) present in ferromagnetic ore. Perhaps because of this, it is called a "magnet."

It is magnetic when it is mined and is gray-black, but this natural magnet is usually not strong. It also has its own melting point, the melting point of ferrous oxide is 1594.5 degrees Celsius.

However, no matter what the magnet melts, it is the same as other substances, but becomes liquid. No special phenomena will occur. The only thing that can happen is to lose "attraction".


About Curie Point

The curiosity about magnets makes us want to see what happens after melting. As early as the 19th century, a scientist did this. It not only melts the magnet, but also found that if the magnet is heated to a certain temperature, it will lose its magnetic force.

This scientist is Pierre Curie, so the temperature when the magnet loses its magnetic force is called the Curie point or Curie temperature. You may not know him, but you must know his wife, Mrs. Curie.

Curie temperature and melting point are not the same concept. In fact, the Curie temperature of ferric oxide is only between 480 and 550 degrees, which is a little far from its melting point.


Why does a magnet lose its magnetism at high temperatures?


When the magnet is heated, the thermal movement of the metal lattice affects the order, magnetic domains and magnetic moments inside the magnet, and then the magnetic domains will be decomposed by high temperature, and the magnetic moment will also become zero. Magnetism is transformed into paramagnetic substances, or the magnetism disappears.

It may be difficult to understand here, but if you know why they are magnetic, it is easy to understand.

Matter is composed of molecules, and molecules are composed of atoms. Atom consists of electrons and nucleus. When electrons move around the nucleus, the movement of the electrons will produce magnetism. The reason why ordinary substances are not magnetic is because of their nuclei. The movement of electrons in it is chaotic and cancels each other out.


However, the electrons in the magnet atoms are different. They have different numbers of electrons in different moving directions, so after canceling each other, some of the electrons will still be magnetized, and they will change from chaos to order, thereby being magnetized and generating a magnetic field.

But temperature returns the order of electrons to a chaotic state, and therefore loses magnetism.



Finally: Curie uses points


Of course, this is not a useless discovery. It has appeared in our lives, but sometimes we ignore it. When it reaches a certain temperature, it will lose its magnetism. This is actually a very easy-to-use feature.


Rice cookers are more common in life. The reason the rice cooker knows that the rice should stop heating is because there is a magnet on the heating plate.

When heated, the water in the pot starts to boil, but the temperature of the water cannot exceed 100 degrees Celsius under normal pressure. When the water is boiled, or the temperature will start to rise after the rice is cooked, as long as the Curie point of this magnet In the early 100 degrees, it will quickly lose its magnetism, and then stop heating. At this time, the rice is just right and very fragrant. The heat preservation of the rice cooker is actually another system that only intervenes after cooking.


Zhongke magnet factory marvels at the ingenuity of the inventors, but all this is still due to the efforts of the pioneers of science. Zhongke magnet factory has been producing ferrite and neodymium magnet since 1985, welcome to contact us if you're looking for wholesale or customized magnetp product.



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