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Fully realize 3 d printing density high coercive force of ndfeb magnet

by:Newland     2020-03-23
Using 3 d printing molding products, rare earth permanent magnet can realize near net shaping complex shape product, avoid the waste of the rare earth resources, but the density of magnets and magnetic is far lower than the bonded magnets and sintered magnets. Small make up recently in arXiv. Org website found an article, reported a using low melting point alloy grain boundary diffusion technology can improve 3 d print of rare earth permanent magnet magnetic products. Relevant results will be hoping to promote 3 d printing industrial application in the field of rare earth permanent magnet materials. 3 d printing technology as a 'bottom-up' new manufacturing technology, in manufacturing high precision complex shape device has broad application prospects. In the field of rare earth permanent magnet system build, 3 d printing technology has been applied in the manufacture of adhesive magnet. But as a result of the adhesive magnet contains a lot of polymer adhesive, can lead to the density of magnets and magnetic is far lower than the sintered magnets. Therefore, print has the density of rare earth permanent magnet materials has been a hot spot in the increasing material manufacturing technology in recent years, and printing performance of rare earth permanent magnet device needs to solve technical problems. Austrian researchers by 3 d printing and injection diffusion technology, successfully solved the problem. From the university of Vienna Christian Huber and others to McGonagall kunduz magnetic MQP - of the company S spherical powder ( Figure 2 a) As a raw material, using a called laser cladding powder preparation of 3 d printing has low density (ndfeb magnet Figure 2 b and 2 c) 。 Microporous structure and high specific surface area, the magnet is conducive to the injection of low melting point alloy diffusion. In order to create a microchannel, they through the parameters of regulation will completely melt process instead of partial melting of sintering process, but can still guarantee print magnets with complete structure and good strength. The whole printing process in oxygen content lower than 0. 1% of argon gas, powder coated carbon fiber brush, the thickness of each layer of powder is 20 microns. In order to ensure the cooling speed, the sample is printed directly on the steel substrate, no additional support structure. In order to find a suitable preparation technology, their research on trajectory of particles melt at the same time to optimize the laser power and scanning speed v P, scanning space, and introduce Eline ( =P/v) The physical parameters to optimize the preparation process. The study found that when P P 40 w, Eline acuity 0. 1 J/mm particles was completely molten; When P = 40 w, Eline = 0. 0 3 - 0. 07 J/mm can satisfy the requirement of the partial melting of sintering process. Optimize the process of the preparation of specifications for 5 * 5 * 5 mm3 cubic printing density of the magnet, after drying to attain 65 plus or minus 2% theoretical density, the density is slightly higher than the MQP - S magnetic powder compaction density ( 61. 4%) 。 But because the print rich neodymium magnet is greater than surface area and lack of grain boundary phase, which is low density and coercive force. In order to solve this problem, Huber et al. , the introduction of low melting point injection of rare earth alloy diffusion technology, will Nd70Cu30, Nd80Cu20, Nd60Al10 Ni10Cu20, Nd50Tb20Cu30 low melting point alloy injection into the channel of ndfeb magnets, printing, combined with the subsequent heat treatment process, successfully obtained the density reached 7. More than 5 g/cm3 print magnets, the density is very close to the business of sintered ndfeb magnet density ( 7. 5 - 7. 7 g/cm3) 。 Particular way is: first, using rapid quenching process, the preparation of the low melting point alloy strip and strip broken into flake powder particles. According to the 'quality is faster than the quenching powder covering on the surface of 3 d printing magnets, then under the condition of vacuum and 650 ° C temperature annealing 3 hours, can get close to the density of ndfeb 3 d printing magnets. At the same time, due to the low melting point of grain boundary phase or heavy rare earth element neodymium rich injection, the preparation of magnet coercive force is improved, which provides a possibility for the practical application of magnets. 【 With laser cladding powder preparation of 3 d printing technology in different low melting point injection ndfeb magnet hysteresis loop of rare earth alloy before and after. 】 In addition, they also found through further analysis, adopt the method of hole injection Nd50Tb20Cu30 diffusion low melting, not only can realize the heavy rare earth elements on the surface of grain to form ( Nd、结核病) 70 fe30b shell ( Figure 4) , and to be able to spread down to a temperature of 650 ° C, the temperature was significantly lower than the traditional grain boundary diffusion heavy rare earth elements required above 850 ° C temperature conditions. Huber, et al. developed the technology to use technology to manufacture the high density, coercive force of ndfeb 3 d printing magnet provides a simple and feasible method. The team's research has made 3 d printing the density of ndfeb magnet dream into reality, also let to make complex shape magnet no longer out of reach, but also can greatly save precious rare earth resources. In the future man will have what kind of 'super technology'? Let us together look forward to the future, wait and see! Ricky article data from the network, by the magnetic steel manufacturers xiaofu finishing editing.
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