The production and application of the development of late bonded NdFeB permanent magnetic material, the application is not wide, the amount is small, mainly for office automation equipment, electrical machinery, audio-visual equipment, instrumentation, small motor and mechanical measurement. The application proportion of China's Bonded NdFeB permanent magnetic materials in recent years: computer accounted for 62%. The electronics industry accounted for 7%, accounting for 8% of office automation equipment, automotive equipment accounted for 7%, accounted for 7%, other 9%. NdFeB magnets can be widely used in motor, engine, voice coil motor, magnetic resonance imaging, communication, control instruments, audio equipment and so on. The main application is VCM (sound at present, coil motor) sintered NdFeB magnets produced abroad for about half of the VCM. in addition to VCM, widely used field of electric motors and generators, with the development of automobile industry, there will be a large growth in demand for NdFeB magnets in this field Rare earth permanent magnet motor. The market potential is huge, the field has not yet been fully developed. At present, the domestic rare earth permanent magnet motor is about 2 million kW, equivalent to only 400 million of the total capacity of all kinds of motor kW 0.5%. with rare earth day high motor to replace the old J-JO and J2-JO2 series motor 50%, which is about 100 million kW, high performance sintered NdFeB magnets 50 thousand tons. Use of rare earth permanent magnet motor, can save 15% ~ 20%, reduce the weight of the motor 20%. Rare earth permanent magnet motor, has been listed as the Ministry of science and technology of rare earth application Engineering "project.
Automotive industry
The automobile industry is one of the areas of NdFeB permanent magnet used in every car. In general, the 30 components using a permanent magnet. It is said that the number of foreign luxury cars in the use of micro motor has been as high as 70, to complete a variety of car control action. Now the world's annual car 55 million cars. According to each motor number from the current average of 20, to 2005 increased to 30, the number of motor forecasts from the current 800 million to 1 billion 600 million. As the only car to miniaturization, lightweight and high performance direction, the magnet used in vehicles of the increasingly high demand this will speed up the NdFeB permanent magnet, especially the development of bonded NdFeB magnets. If bonded NdFeB magnets increase 50% in cars, each car needs 102G, according to the global annual output of 55 million cars, should be bonded anisotropic NdFeB magnets is about 5 600 tons. Estimated in 2005 the world's permanent magnet output value will exceed $10 billion.
Computer industry
With the advent of the information age, the computer has been formed into the home boom. According to the market survey, in 2000 the world only domestic PC machine total sales will reach 40 million units, in 2005 reached 80 million. The development of computer and related components of the hard disk drive, floppy disk, a head is used NdFeB more, every year for the computer drive Nd-Fe-B magnet is about 4000 tons, accounting for NdFeB sales 50%.1999 years, global production of HDD 165 million 700 thousand, 16%. HDD growth now toward greater capacity than in 1998, high-speed data transmission and save space and direction.
Nuclear magnetic resonance imaging industry
Magnetic resonance imaging is a new equipment new technology application in 80s, he can shoot photos from different angles on the human body internal organization, so as to form a three-dimensional image, determine the nature and morphology of lesions, to determine the initial tumor. It is helpful in the past with superconducting magnets, disadvantage is high cost and high operation cost. If for permanent ferrite to do an NMR spectrometer for permanent ferrite 100 tons, and if the use of NdFeB magnets to do, each only 0.5 tons, if the future of the world market demand for 10 thousand years, to 5000 tons of NdFeB magnets.
Prospect and existing problems
At present, China's production of NdFeB magnets has exceeded that of Japan, is the production of power. In recent years, there has emerged nearly 10 sales over billion yuan of enterprise groups and more than and 10 electronic components hundred enterprises, export more than and 20 ultra billion enterprise orders at home and abroad is abundant, the market is large, showing the the development of the industry has been getting better, is entering the fast track. But we also see that China's NdFeB magnets there is a certain gap compared with foreign products in performance and technology, mainly in thermal stability, oxidation resistance is not completely solved; the product magnetic instability, magnet processing, bonding and magnetizing techniques such as problems to be a new breakthrough.
