さなえ希土類磁石の世界

私は1980年代半ば以降、希土類永久磁石、ネオジム磁石、SmCo磁石、セラミック磁石、フレキシブル磁石。

Magnetic Applications in Astronomy

2018-08-30 16:56:15 | フレキシブル磁石
We already know that the earth is a huge magnet, so where does its magnetism come from? Is it ever since ancient times? How does it relate to geological conditions? What is the magnetic field in the universe?

We have seen brilliant northern lights at least in the picture. Our country has recorded the aurora borealis since ancient times. The aurora borealis is actually the result of the interaction between the particles in the solar wind and the geomagnetic field. The solar wind is a high-energy charged particle stream emitted by the sun. When they reach Earth, they interact with the Earth's magnetic field, as if an electric wire were acting in a magnetic field, causing the particles to move and gather toward the North and South Poles, and collide with the rarefied gases above the Earth, resulting in the gas molecules being excited to emit light.

Sunspots are very intense areas of magnetic activity on the sun. The outbreak of sunspots can have an impact on our lives, such as temporarily disrupting radio communications. Therefore, it is important for us to study sunspots.


Geomagnetic changes can be used to explore deposits. Because all materials have strong or weak magnetism, if they gather together to form a deposit, then it will inevitably interfere with the geomagnetic field in the vicinity of the region, making the geomagnetic anomaly. According to this, the magnetism of the earth can be measured on land, in the ocean or in the air, the geomagnetic map can be obtained, the magnetic anomaly area on the geomagnetic map can be analyzed and further exploration, often unknown mineral deposits or special geological structures can be found.


Rocks with different geological ages often have different magnetic properties. Therefore, the geological age and the crustal movement can be judged by the magnetism of the rocks.

Many mineral resources are symbiotic, that is, several minerals are mixed together, they have different magnetism. Using this feature, magnetic separators have been developed, which use different magnetic properties of minerals with different compositions and different magnetic strength to attract these substances. Then the attraction of these substances is different. As a result, the minerals with different magnetic properties mixed together can be separated and magnetic separation can be realized.

For more information, please visit https://www.usneodymiummagnets.com/

What are the Types of Magnets?

2018-08-30 16:51:28 | フレキシブル磁石
There are many kinds of magnets, generally divided into permanent magnets and soft magnets.

The permanent magnet is divided into two categories:

The first category is: metal alloy magnets include NdFeB, SmCo and AlNiCo magnets.


The second category is ferrite permanent magnet.

1. Neodymium-iron-boron magnet: It is the most commercially available magnet, known as the magnet king, with extremely high magnetic properties, its maximum magnetic energy product is more than 10 times higher than that of ferrite. Its mechanical properties are quite good. The working temperature can reach up to 200 degrees Celsius. Moreover, its texture is hard, its performance is stable, and its cost performance is very good, so its application is extremely extensive. But because of its strong chemical activity, the surface layer must be treated.

2. Ferrite magnet:
its main raw materials include BaFe12O19 and SrFe12O19. It is a brittle material with hard texture. Ferrite magnet has been widely used because of its good temperature resistance, low price and moderate performance.

3. Aluminum nickel cobalt magnet: an alloy consisting of aluminum, nickel, cobalt, iron and other trace metals. The casting process can be made into different sizes and shapes, with good workability. The cast aluminum nickel cobalt permanent magnet has the lowest reversible temperature coefficient, and the working temperature can reach up to 600 degrees Celsius. Al Ni Co permanent magnet products are widely used in various instruments and other applications.

4. Samarium cobalt (SmCo) is divided into SmCo5 and Sm2Co17 according to their components. Because of the high price of materials, their development is limited. SmCo, as a rare earth permanent magnet, not only has a high magnetic energy product, reliable coercivity and good temperature characteristics. Compared with NdFeB magnets, samarium cobalt magnet is more suitable for working in high temperature environment.

For more information, please visit https://www.usneodymiummagnets.com/