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Quasicrystal Research


Nature, because of its low surface energy, and oil-binding capacity is small, easy to clean. France was the first successful development of a quasi-crystal non-stick coating, to replace the current non-stick coating Teflon poor wear resistance, high hardness and wear resistance helps to extend the service life. The infrared quasi-crystal with a high conductivity, studies have shown that the A1 is only a 10cm thick Cu-Fe quasicrystalline coatings in the short wavelength light absorption rate when 92 or more,[link widoczny dla zalogowanych], as the optical functional materials show a good prospect Quasicrystal An important application is that it's brittle, difficult to use as a structural material directly. This greatly limits its scope of application, the current general adopted or made of composite materials prepared by coating two ways to solve the problem. 5 Conclusion quasicrystals found so far, but ten years from the time, because of its special structure and performance, has attracted great interest from researchers around the world, and recognizing the development potential of this new material. However, due to Quasicrystal short history, there are still many issues to understand in depth enough for truly practical applications, much work needs to be done to further explore the preparation of quasi-grained materials, the relationship between structure and properties and application conditions ( 3Y Cheng Tianyi, rapid solidification technology and new alloys, aerospace and so on. Press, 1990 References [1] D. Shechtman, I. Blech, D.Gratiaseta1Phys.Rev.Let., 1984V53, P1951 [2] D.ShechtmanandI.Blech , MetTrans., 1985,16 A.P1005 (43A.Sadoc.E.BelinandZ.Dnkhaz�� eta1.J.Non-Crys.Solids, 1993.V153.P338 [5.ArehambaultandC.Janot.MRS.Bul1., 1997, NOV . P48 [6] K. Urban, M.FeuerbacherandM.W0l1garten.MRS.Bu11., l997, N0v, P65 ���� ���� ���� 7,777,[link widoczny dla zalogowanych],777,[link widoczny dla zalogowanych],777,777,777,777���� ���� 7,777,777,777,777,777 the world's strongest system Nd-Fe-B sintered permanent magnets Nd-Fe-B permanent magnet system is the first 3 generation of permanent magnet material, it Compared with the previous two generations of magnetic materials, remanence, coercivity and energy product range has increased too, and good mechanical properties, magnetic components can lightweight, thin, small and ultra small size, is the current electronic mechanical and electrical industries indispensable functional materials. 8O late,[link widoczny dla zalogowanych], Nd-FeB sintered permanent magnet system maximum energy product of 400kJ / m (5OMGOe) around. l994 reached 431kJ / m (54.2MGOe) Sumitomo Special Metals sets of community-type strains on how to make Nd-Fe-B sintered permanent magnet system the maximum magnetic energy product close to its theoretical value: 512kJ / m (64MGOe). to further miniaturization of magnetic components, light weight, the 7 plus I technology improvements and research at the Jet grinding mechanism introduced in-line process of precision powder particle size classification technology, particle surface modification with the lubricant. development of a new Nd-Fe-B powder grinding process using new technology does not mix lO # m above the coarse particles, sintered The crystal grain size can be refined into uniform emblem is about 5m. fill in the rubber mold powder to pass into the induction loop prompt asking too current, pulsed magnetic field with magnetic field orientation, the use of hydrostatic molding (CIP) compression shape, develop 7 new hydrostatic forming method. Since the new method for forming full equality of compression, the amount of movement uniaxial compression molding and metal die less than 1 / 3, and to prevent friction caused by the metal mold wall orientation confusion, the crystalline orientation degree of success close to 98. Sumitomo Special Metals Co.,[link widoczny dla zalogowanych], I add a new powder technology and improved CIP technology, for the first time the Department of sintered Nd-FeB magnets remanence (Br) over 1.5T . to l_5147T (15.14kG), about the theoretical value of 95, the maximum magnetic energy product (Br) max to 444kJ / m (55.8MGOe), the highest in the world. and I industry, production of sintered NdFeB permanent magnet system compared to the maximum magnetic energy product by about 71], with the current record (431kJ / m) compared to about 3 by 7. Sumitomo Special Metals line style basket business community began production of energy product I 400kJ / m (50MGOe) above The Department of sintered Nd-FeB magnets Ben Kanxun ll

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