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 Wysłany: Wto 15:33, 30 Lis 2010 Temat postu: mbt fora shoes Pure graphite sintered NdFeB magnet |
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Pure graphite sintered NdFeB magnets on the Microstructure and Magnetic Properties
Coercivity increased significantly. Secondly, the main phase grain boundary shape of a great influence on the coercivity. When NdFe. B flat and clear boundaries, the main phase is the high surface anisotropy field, magnetization reversal domain nucleation is difficult, and thus higher coercivity, and when the grain boundary disorder, blurred, where defects are more easy magnetization reversal domain nucleation, coercive force and thus far lower coercivity. C, respectively containing 0.05wt and 0.1Wt magnetic body, the main phase grain growth, causing the coercivity decreased. Subsequently, the grain size decreases, the coercivity and gradually increased in the 0.4% wt with C when the peak. However, with the further increase of C content, c start \decreased and then increased further decline, while the coarse grain size at first and then \phenomenon. After studies suggest that changes in grain size is C 3 grain coarsening caused by DNA and Nd: Fe. C to prevent the formation of grain growth, resulting in grain refinement of the results of two effects compete with each other. Meanwhile, grain size and shape of the combined effect of grain boundary led to the coercive force changes so strange. 6'7 Reference 891SchneiderG. eta1. ZMetallkde, 1986,77:155 KnockKG,[link widoczny dla zalogowanych], eta1. IEEETransMagn, 1990. 25:3426 MooijDBDE, BuschowKH. JLess-CommonMet, 1988. I42: 349BuschowKH, el: a1. JIess-CommonMet, 1988,[link widoczny dla zalogowanych],141: I | 15FemengelW. IEEETransMagn, 1994, MAG one 30:634 AndrewSK. JApplPhys, 1991. 70:6462 LiuNC, KimAS. JApp | Phys, 1990,67:4629 Zhao Xian,[link widoczny dla zalogowanych], Song Xiaoping, Chen Zhongmin and so on. Metal Technology, I996, 32:413 RameshR, eca1. jApplPhys,[link widoczny dla zalogowanych], 1988,64:6423 'EffectsofCAdditiononMicrostructureandMagneticPropertiesofNdFeBSinteredMagnetsZhaoGouxianSongXiaopingChenZhongmingYanAruWangXiaotian (TubularGoodsResearchCenterofNationalPetroliumCorporation, Xi'an, 710065, China) (Xi'anJiaotongUniversity, Xi'an, 710049, China) ABSTRACTAddingCtOtheintergranularregionbroughtwonderfulchangesincoercivityandgrainsize. WiththeincreasingofCcontent, coercivityfirstrosethendescendedandfinallyascended. Atthesametime, grainsizeincreasedfirstanddecreasedthen. When0.4% WtCwasadded, intergranularslostsmoothness. TheresultofX-rayspectrashowedthatNd2Fel7CappearedintheC-containingmagnets. ThechangesofcoercivityandgrainsizewereattributedtOtheformofNd2Fel7C. KEYWORDSNdFeBmagnets,[link widoczny dla zalogowanych], mierostructure, magneticproperty \
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