NdFeB magnets can be divided into bonded NdFeB and sintered NdFeB.
Bonding is actually injection molding, while sintering is vacuuming through high temperature heating molding!
NdFeB magnets are the strongest permanent magnets to date. The material grades are N35-N52; various shapes can be processed according to specific requirements: round, square, perforated, tile, bar, convex, trapezoidal, etc. Despite these advantages, the surface is easy to rust, so it is usually necessary to make some protective surface treatment: nickel-plated, zinc-plated, gold-plated, epoxy-plated, and so on. The ambient temperature of ordinary NdFeB magnets is below 80 degrees, but there are several kinds of magnets that can withstand high temperature up to 200 degrees. Mainly used in electronics, electrical appliances, packaging, motors, toys, leather goods, automotive machinery and so on.
NdFeB applications:
1, microwave communications technology in the application: in radar technology, satellite communications, remote control telemetry technology, electronic tracking, electronic countermeasure technology needs to be used, magnetronics tubes, magnetron traveling-wave tube, cathode ray tube, circulators and so on should be used in neodymium-iron-boron.
2, in the application of electrical engineering: more than one-third of the output of rare-earth permanent magnet materials are used to manufacture a variety of permanent magnet motors, permanent magnet motors have the advantage of saving copper, electricity, light weight, small size, than the power is high. Electric bicycle motors, computer drive motors, lathes and other speed and speed measurement motors, elevator tractor motors, mahjong motors, refrigerator air-conditioning motors, wind motors, automotive motors and other applications are extremely wide.
3, in the application of electro-acoustic devices: such as speakers (speakers), microphones, hearing aids, stereo headphones (MP3, MP4), telephone receivers and electro-acoustic sensors and so on.
4, in the magnetic mechanical engineering applications: magnetic machinery, including magnetic actuators, magnetic gears, magnetic brakes, magnetic fixtures, magnetic salvage, magnetic bearings, magnetic pumps, magnetic valves, magnetic seals, magnetic locks, and permanent magnetic cranes, permanent magnetic lifters, etc..
5, in the application of transportation tools: the use of the principle of repulsion of the same sex and the manufacture of the train called magnetic levitation train; modern limousines need to use 15-70 permanent magnetic devices, such as: windshield wiper motors, oil pump motors, window motors, door locks motors, de-fogging motors, automatic vapor controllers, starting motors and so on.
6, in the magnetic separation technology: the use of magnetic methods to separate the ferromagnetic material and non-ferromagnetic material technology is called magnetic separation technology. Magnetic separation technology is widely used in mineral processing, coal beneficiation, raw material processing, water treatment, waste treatment and in medical, chemical industry and food industry.
7, in the application of magnetization technology: the use of magnetic fields on the material magnetization effect, change the bonding state and nature of the magnetized material; or change the atomic and electronic state, to promote the chemical reaction of the material and the combustion of fuels; or to change the crystalline form of the material or the solidification point, the technology is called magnetization technology. Magnetizer, fuel saver in the car, oil extraction in the oil anti-waxer and so on.
8, in the application of magnetic therapy and fitness equipment: such as magnetic therapy cups, magnetic balls, magnetic therapy machines, magnetic therapy shoes, magnetic therapy caps, magnetic therapy bracelets, necklaces, etc., and in recent years the development of faster medical equipment, nuclear magnetic **** vibration imaging instrument (MRI) per unit of the dosage of 3 - 4 tons, imagine if each hospital in China with a MRI NdFeB dosage should be how much!
NdFeB future development:
1, product development. NdFeB since its invention in 1983 since the first ten years of development is not fast, the last ten years of development is very fast, 96 years China 360 tons, Japan's production of 2,000 tons, the United States production of 1,000 tons, but by 2006 China's production of 60,000 tons, Japan's production of 2,000 tons, the other countries are almost no, the world's production of NdFeB production of sintered and bonded combined with about 100,000 tons (of which 20,000 tons of bonding)
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2, business: 1998 before the western world than China's rapid development, China's slow development. But so far, there are only four enterprises left in Japan, only one in the United States, and only one in Europe, while there are more than one hundred in China. Therefore, China is the world's big producer of NdFeB, but not a strong country. China's NdFeB production 60% in Zhejiang, the other in Shanxi and Beijing-Tianjin area, NdFeB sales base in Shenzhen, Ningbo and Beijing.
3, the development of performance: the development of NdFeB performance is dependent on the improvement of technology and the use of advanced equipment before the rapid development of 96 years ago, China's best performance for the N38, the world's best for the N48, and in 2006, China's best for the N52 the world's best for the N52 (large-scale production), the performance of the performance of NdFeB to improve very quickly, the performance of China's NdFeB to improve even more quickly, China has been Gradually from the production of large countries into a production power.
4, the development of the process: the earliest NdFeB process is wet production, with toluene or gasoline as a protective agent, ball milling production, low performance, and later developed to dry production (air milling) performance can be greatly improved, but the best performance can only be N45, but since the invention of the dumping belt (SC) process performance has been greatly improved, and the current batch can be done to reach N52.
5, the development of equipment: the equipment has been developed to improve the performance of NdFeB, and the best performance can be N52 (scale production). p>5, the development of equipment: ball mill to air mill, ingot to cast piece to hydrogen crushing, single sintering furnace to continuous multi-sintering furnace, simple press to automatic press, equipment development process breakthroughs is the key to reduce the cost of neodymium-iron-boron performance improvement.
6, the development of post-processing technology: early NdFeB follow-up processing technology is relatively monotonous and wasteful, the main processing technology has slicing, wire cutting, punching, centerless grinding, vertical grinding, etc., along with the rapid development of NdFeB the use of the expanding field of application, the processing technology and equipment has also undergone a great deal of change, the set of holes (to improve the comprehensive utilization of the material), set of tiles, grinding tiles, such as the double-sided grinding of new processing technology has been widely used for NdFeB, and the development of new processing technology is the key to reduce the cost of performance improvement. Processing technology is widely used for NdFeB to reduce costs and improve precision to create the conditions.