Nanocrystalline NdFeB film was fabricated onto the copper substrate through direct current electroplating method,and characterized by scanning electron microscope(SEM) coupled with energy dispersive X-ray spectroscope...Nanocrystalline NdFeB film was fabricated onto the copper substrate through direct current electroplating method,and characterized by scanning electron microscope(SEM) coupled with energy dispersive X-ray spectroscope(EDS),vibrating sample magnetometer and potentiodynamic polarization techniques.The initial electroplating behavior was investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) techniques.Results revealed that the corrosion resistance of the NdFeB film was better than that of the traditional sintered NdFeB magnet.The depositing process of the NdFeB film followed the three-dimensional nucleation and subsequent grain growth mechanism,and was controlled by charger transfer.With the increase of the negative potential bias,the deposition mechanism of NdFeB film changed from heterogeneous to homogeneous nucleation/growth,which consequently resulted in the decrease of charge-transfer-resistance.展开更多
Pure Al coating was deposited on sintered NdFeB magnet by direct current（DC） magnetron sputtering to improve the corrosion resistance of magnet. The influences of coating thickness and sputtering power on microstruc...Pure Al coating was deposited on sintered NdFeB magnet by direct current（DC） magnetron sputtering to improve the corrosion resistance of magnet. The influences of coating thickness and sputtering power on microstructure and corrosion resistance of Al coating were investigated. The surface morphology of Al coating was characterized by scanning electron microscopy（SEM）. The corrosion properties were investigated by potentiodynamic polarization curves and neutral salt spray（NSS） test. The formation of the uniform and compact Al coating is a necessary condition to achieve excellent corrosion resistance. And the optimal corrosion resistance can be obtained in the sample with 6.69 μm thick Al coating deposited at 51-82 W.展开更多
采用磁控溅射法制备了Nd Fe B/Nd 2组薄膜,经650℃退火处理后,对样品进行了XRD和VSM测试分析。结果表明:对于Mo/Nd/Nd Fe B/Nd/Mo多层薄膜,当Nd Fe B/Nd厚度比为6/5时,薄膜的内禀矫顽力最好,平行和垂直方向的内禀矫顽力分别为14.5×...采用磁控溅射法制备了Nd Fe B/Nd 2组薄膜,经650℃退火处理后,对样品进行了XRD和VSM测试分析。结果表明:对于Mo/Nd/Nd Fe B/Nd/Mo多层薄膜,当Nd Fe B/Nd厚度比为6/5时,薄膜的内禀矫顽力最好,平行和垂直方向的内禀矫顽力分别为14.5×79.6和10.5×79.6 k A·m^(-1);对于Mo/[Nd Fe B/Nd]n/Mo(n=2,5,8,10;Nd Fe B/Nd厚度比为6/5)交替多层薄膜,当周期n为8时,薄膜具有最好的磁性能,平行和垂直方向的内禀矫顽力分别为21.3×79.6和16.7×79.6 k A·m^(-1);对于Nd Fe B/Nd厚度比均为6/5的薄膜,交替多层膜的综合磁性能高于多层膜。展开更多
基金Project(2008BS04030)supported by Research Award Fund for Outstanding Young Scientists in Shandong Province,China
文摘Nanocrystalline NdFeB film was fabricated onto the copper substrate through direct current electroplating method,and characterized by scanning electron microscope(SEM) coupled with energy dispersive X-ray spectroscope(EDS),vibrating sample magnetometer and potentiodynamic polarization techniques.The initial electroplating behavior was investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS) techniques.Results revealed that the corrosion resistance of the NdFeB film was better than that of the traditional sintered NdFeB magnet.The depositing process of the NdFeB film followed the three-dimensional nucleation and subsequent grain growth mechanism,and was controlled by charger transfer.With the increase of the negative potential bias,the deposition mechanism of NdFeB film changed from heterogeneous to homogeneous nucleation/growth,which consequently resulted in the decrease of charge-transfer-resistance.
基金Project(NCET-11-0127)supported by Program for New Century Excellent Talents in University,ChinaProject(K1306063-11)supported by the Key Project for Science and Technology of Changsha,China
文摘Pure Al coating was deposited on sintered NdFeB magnet by direct current（DC） magnetron sputtering to improve the corrosion resistance of magnet. The influences of coating thickness and sputtering power on microstructure and corrosion resistance of Al coating were investigated. The surface morphology of Al coating was characterized by scanning electron microscopy（SEM）. The corrosion properties were investigated by potentiodynamic polarization curves and neutral salt spray（NSS） test. The formation of the uniform and compact Al coating is a necessary condition to achieve excellent corrosion resistance. And the optimal corrosion resistance can be obtained in the sample with 6.69 μm thick Al coating deposited at 51-82 W.
文摘采用磁控溅射法制备了Nd Fe B/Nd 2组薄膜,经650℃退火处理后,对样品进行了XRD和VSM测试分析。结果表明:对于Mo/Nd/Nd Fe B/Nd/Mo多层薄膜,当Nd Fe B/Nd厚度比为6/5时,薄膜的内禀矫顽力最好,平行和垂直方向的内禀矫顽力分别为14.5×79.6和10.5×79.6 k A·m^(-1);对于Mo/[Nd Fe B/Nd]n/Mo(n=2,5,8,10;Nd Fe B/Nd厚度比为6/5)交替多层薄膜,当周期n为8时,薄膜具有最好的磁性能,平行和垂直方向的内禀矫顽力分别为21.3×79.6和16.7×79.6 k A·m^(-1);对于Nd Fe B/Nd厚度比均为6/5的薄膜,交替多层膜的综合磁性能高于多层膜。
