Introduction to the types, basic knowledge and application of magnets
There are many kinds of magnets, generally divided into two categories: permanent magnet and soft magnet, and permanent magnet is divided into two categories. The first category is: metal alloy magnets include neodymium iron boron magnets（Ndfeb）, samarium cobalt magnets, aluminum nickel cobalt magnets. The second category is ferrite permanent magnet.
1. Ferrite magnet: the main raw materials of ferrite include BaFe12O19 and SrFe12O19. It is made by ceramic technology. It is hard and brittle. Because of its good temperature resistance, low price and moderate performance, ferrite magnet has become the most widely used permanent magnet.
2. Neodymium iron boron magnet: neodymium iron boron is the magnet with the highest commercialization performance found at present, which is known as the king of magnetism. It has extremely high magnetic properties and its maximum magnetic energy product (BHmax) is more than 10 times higher than that of ferrite. Its own machining performance is also quite good. The maximum operating temperature is 200 ℃. Moreover, it is hard in texture, stable in performance and good in cost performance, so it is widely used. However, because of its strong chemical activity, it is necessary to coat its surface. (such as Zn, Ni plating, electrophoresis, passivation, etc.).
3. SmCo magnet can be divided into SmCo5 and Sm2Co17 according to different components. The development of SmCo is limited because of its high price. SmCo, as a rare earth permanent magnet, not only has high magnetic energy product (14-28mgoe), reliable coercive force and good temperature characteristics. Compared with NdFeB magnet, SmCo magnet is more suitable for working in high temperature environment.
4. Alnico magnet: alnico is an alloy composed of aluminum, nickel, cobalt, iron and other trace metal elements. The casting process can be processed into different sizes and shapes with good machinability. Casting alnico permanent magnet has the lowest reversible temperature coefficient, and the working temperature can be as high as 600 ℃. Alnico permanent magnet products are widely used in various instruments and other applications.
The magnetic force is arranged as follows: neodymium iron boron magnet, samarium cobalt magnet, aluminum nickel cobalt magnet and ferrite magnet.
Neodymium iron boron magnet
Characteristics: Nd2Fe14B is a permanent magnet material based on the intermetallic compound Nd2Fe14B. Neodymium iron boron (NdFeB) permanent magnet materials have been widely used in modern industry and electronic technology due to its high magnetic energy accumulation and coercive force and high energy density, which makes it possible to miniaturize, lighten and thin the instruments, electro acoustic motors, magnetic separation magnetization and other equipment.
Material characteristics: the advantages of NdFeB are high cost performance and good mechanical properties; the disadvantages are low Curie temperature point, poor temperature characteristics, and easy to be powdered and corroded. It must be improved by adjusting its chemical composition and adopting surface treatment methods to meet the requirements of practical application.
Manufacturing process: powder metallurgy process is adopted for the manufacturing of NdFeB.
Shape category: rare earth neodymium magnet can produce cylindrical, toroidal, rectangular, tile shaped, special-shaped. Perforation.
Technological process: batching → smelting and ingot making → powder making → molding → sintering and tempering → magnetic detection → grinding → pin cutting → electroplating → finished product.
Features of ferrite magnet: its main raw materials include BaFe12O19 and SrFe12O19. It is made by ceramic technology. It is hard and brittle. Because of its good temperature resistance, low price and moderate performance, ferrite magnet has become the most widely used permanent magnet.
Ferrite magnet features: high magnetic properties, good time stability and low temperature coefficient.
Applications of ferrite magnets: widely used in meters, meters, motors, automatic control, microwave devices, radars and medical devices.
Magnetization direction of ferrite magnet: axial, radial or as required.
Ferrite magnet shape: can produce cylindrical, circular, rectangular, flat, tile, axe shape.
Characteristics of alnico magnet: it is an alloy composed of aluminum, nickel, cobalt, iron and other trace metal elements. The casting process can be processed into different sizes and shapes with good machinability. Casting alnico permanent magnet has the lowest reversible temperature coefficient, and the working temperature can be as high as 600 ℃. Alnico permanent magnet products are widely used in various instruments and other applications.
Classification of AlNiCo magnets: they can be divided into cast alnico and sintered alnico.
Application place of alnico: Casting alnico products are mainly used in automobile parts, instruments, electroacoustic, motor, teaching, aerospace, military and other fields, with the advantages of low temperature coefficient, high temperature resistance, moisture resistance, not easy to oxidize and good working stability. Sintered alnico is produced by powder metallurgy. It is suitable for the production of complex, light, thin and small products. It is widely used in instruments, communications, magnetoelectric switches and various sensors.
Shape of alnico magnet: it can produce cylindrical, circular, rectangular, flat, tile and horseshoe.
Article by neodymium magnet supplier courage xiaofu share, If you have magnet problem or need to purchase magnet, please contact us.
Samarium cobalt magnet
SmCo magnet is also called SmCo magnet steel, SmCo permanent magnet, SmCo permanent magnet, SmCo strong magnet, rare earth cobalt permanent magnet, etc. It is a kind of magnetic material which is made of samarium, cobalt and other metal rare earth materials by proportion, melting into alloy, crushing, pressing and sintering. It has high magnetic energy product and extremely low temperature coefficient. The maximum working temperature can reach 350 ℃, and the negative temperature is unlimited. When the working temperature is above 180 ℃, its maximum magnetic energy product, temperature stability and chemical stability are higher than those of NdFeB permanent magnetic material. It is widely used in aerospace, national defense and military industry, microwave devices, communication, medical equipment, instruments, meters, various magnetic transmission devices, sensors, magnetic processors, motors, magnetic cranes, etc.
Production process of SmCo magnet: batching → smelting and ingot making → pulverizing → molding → sintering and tempering → magnetic testing → grinding → pin cutting → finished product
Typical shape of SmCo magnet: circle, ring, square, square bar, tile, special shape can be processed according to the requirements.
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