A moving charged particle is subjected to what is called a Lorentz force in a magnetic field. The magnetic field strength of charged particles can be distinguished according to the strength of Lorentz magnet in different magnetic fields. Tesla is the international unit for measuring magnetic flux density. Magnetic flux density is the basic physical quantity describing the magnetic field, and magnetic field intensity is the auxiliary quantity describing the magnetic field.
Due to the high magnetic energy product and coercivity of samarium cobalt magnet, as well as its high energy density, samarium cobalt magnet has been widely used in modern industry and electronic technology, realizing the miniaturization of instruments, electroacoustic motors, magnetic separation and magnetization and other equipment. The characteristics of Samarium cobalt permanent magnets are cost-effective and have good mechanical properties. The shortcoming is that Curie temperature point is low, temperature characteristics are poor, and easy to be pulverized corrosion, must adjust its chemical composition, using surface treatment method to improve, in order to meet the requirements of practical application.
Samarium cobalt magnet has excellent magnetic properties, good thermal stability, Curie temperature of about 800, working temperature of about 350, good chemical stability in the air, with these advantages is widely used in microwave communication technology, aerospace, national defense industry, transportation, high-speed drive and other fields. However, the samarium cobalt magnet contains the expensive and rare strategic metal elements Co and Sm, which is very expensive, so the application of this kind of magnet is limited.
Due to high iron content, samarium cobalt magnet is prone to oxidation and corrosion, surface treatment is indispensable, and the life of the magnet largely depends on the effect of the coating. Samarium cobalt magnets contain little iron and are basically metal elements that are not easily oxidized or corroded. They generally do not require surface treatment except in the case of harsh working conditions and electroplating for aesthetic purposes.
The market prospect and important position of samarium cobalt magnets are very important to modern times. Therefore, foreign manufacturers take the surface protection technology of samarium cobalt permanent magnets as an important technical secret. In order to improve product competitiveness, occupy the international market and give full play to the resource advantages of rare earth countries, it is necessary to develop our unique magnet protection technology with intellectual property rights. Its industrial reserves of 4800t, prospective reserves of 120 million tons, accounting for 80% of the world's proven resources. Rare earth permanent magnets represented by samarium cobalt permanent magnets are one of the most important functional materials at present, and their output and consumption have become one of the important symbols to measure a country's comprehensive strength and national economic development level.
