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by:Newland     2020-05-03
Ndfeb magnet is composed of neodymium, iron, boron, Nd2Fe14B) The formation of tetragonal crystal system crystal. In 1982, sumitomo special metals sagawa reality ( Masato Sagawa) Find neodymium magnets. Ndfeb magnet in the contemporary performance is the strongest permanent magnets, the magnetic energy product ( BHmax) 5 - is ferrite magnets 12 times, is the 3 - alnico magnets 10 times; 5 - its coercive force of ferrite magnets 5-10 times, aluminum nickel and cobalt magnet 15 times, its very high magnetic potential, can suck up the equivalent of a weight of 640 times its own weight, is the world's largest material magnetic energy product. Later, sumitomo special metals successfully developed powder metallurgy method ( 粉末冶金过程) Successful, general motors research rotary spray melting method ( 融化, 纺丝过程) To the preparation of ndfeb magnet. The magnet is the strongest permanent magnet of the magnetic, which is the most commonly used rare earth magnets ( 稀土磁铁) 。 Ndfeb belongs to the third generation of rare earth permanent magnet materials with the characteristics of small volume, light weight and strong magnetic, is currently the best price-performance magnets, the magnetic field is known as the king of magnetic. Under the conditions of bare magnetic, magnetic force can reach about 3500 gauss. Its widely used in energy, transportation, machinery, medical, IT, home appliances and other industries, especially with the development of information technology represented by knowledge economy, the function such as rare earth permanent magnet ndfeb industry material constantly bring new USES, is widely used in electronic products, such as hard drives, mobile phones, headsets, and with a battery-powered tools and so on. This brings a more broad market prospect for ndfeb industry. Comparison table below for some common magnet, ferrite magnet alnico magnets, samarium cobalt magnet ndfeb magnet materials in titanium oxide added barium and strontium chemical elements such as aluminum, nickel, cobalt in joining chemical elements such as iron, titanium copper samarium, cobalt, sometimes join the chemical elements such as iron, copper, zirconium, neodymium iron and boron, sometimes join copper, chemical elements dysprosium lamp advantages main material is titanium oxide, so the price is low and not easy to rust resistance to high temperature, hard, not easy to cut after neodymium magnets, magnetic more resistant to high temperature strength of the strongest magnet at present time, more resistant to high temperature faults in four types of magnets in the magnetic force is weakest, texture is soft, not high temperature resistant must make slender to obtain strong magnetic force, USES limited samarium cobalt with fewer resources, high price is not high temperature resistant, easy to rust use microphone, tape, copier toner and magnetic sensors, communications equipment used under the environment of high temperature of magnetic sensors, communications equipment hard disk drives, note the first generation of rare earth permanent magnet electric car motor ( 1:5 samarium cobalt alloy) The second generation of rare earth permanent magnet ( 'Type of samarium cobalt alloy) Production process: the king of the third generation of rare earth permanent magnet magnetic ndfeb magnets can be divided into two kinds of bonded ndfeb and sintered ndfeb. Bond is, in fact, injection molding, and sintering is by vacuum heating forming. Ndfeb magnet industry's core technology is mainly manifested in the manufacturing process, embodies in its product uniformity, consistency, and processing quality and coating quality, etc. Ndfeb magnet with adding different metal elements have many different preparation processes, such as powder metallurgy method, fast melt quenching method and Pr ( Nd) - - - - - - Fe- Cu- B hot/hot rolling method, the reduction of diffusion method, we chose the most common type of powder metallurgy legal system as a process to a simple introduction. Where is the king of magnetic with? Today, says our lives are neodymium magnets walked with not too much from the speaker to air conditioning, the refrigerator to electric cars, will must have a magnet on the current into the power of motor, can say, magnet gives us a modern and comfortable life. Ndfeb is the national 863 project plan high-tech materials, belong to high-end rare earth materials. High cost performance, a wide application, involved in all aspects of life, the only shortcoming is its temperature performance is poor, at high temperatures using magnetic loss is bigger, the highest working temperature is low. General is 80 degrees Celsius, after special processing of the magnet, the highest working temperature can reach 200 degrees Celsius. Its main applications are as follows: acoustic field: the speaker, receiver, microphone, alarm, stage audio, car audio, etc. Electronic appliances: vacuum circuit breaker and permanent magnetic actuator magnetic hold relay, electricity meter, water meter, meter sound device, dry reed pipe, sensors, etc. Motor areas: VCM, CDDVD cd-rom, generators, electric motor, servo motor, micro motor, motor, vibration motor, etc. Machinery and equipment, magnetic separation, magnetic separator, magnetic crane, magnetic machinery, etc. Health care: nuclear magnetic resonance instrument, medical equipment, magnetic therapy health care products, magnetizing economizer, etc. Other industries: magnetization paraffin, pipeline cleaner, magnetic clamping, automatic mahjong machine, magnetic locks, door magnetic magnetic magnetic, magnetic stationery, bags, leather goods, toys, magnetic, magnetic tools, craft gift packaging, etc.
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