The spark plasma sintering (SPS) technique was introduced into the field ofNdFeB preparation due to its own advantages. High property NdFeB magnets with fine grains wereprepared by SPS method. The corrosion behaviors ...The spark plasma sintering (SPS) technique was introduced into the field ofNdFeB preparation due to its own advantages. High property NdFeB magnets with fine grains wereprepared by SPS method. The corrosion behaviors of SPS NdFeB were studied by electrochemicalmeasurements and 92 percent RH hyther tests at 353 K. The results were compared with those of thetraditional sintered NdFeB magnets. It shows that both the SPS NdFeB and the traditional sinteredNdFeB have good corrosion resistance in alkaline environment due to surface passivation; while, thefine grain microstructure of SPS NdFeB results in a more homogeneous phase composition distributionand thus reduces the electrochemical inhomogenity between the ferromagnetic phase and the Nd-richinter-granular phase in the magnet. Therefore, the SPS NdFeB exhibits better corrosion resistancethan the traditional sintered NdFeB in neutral and weak acidic environment.展开更多
文摘The spark plasma sintering (SPS) technique was introduced into the field ofNdFeB preparation due to its own advantages. High property NdFeB magnets with fine grains wereprepared by SPS method. The corrosion behaviors of SPS NdFeB were studied by electrochemicalmeasurements and 92 percent RH hyther tests at 353 K. The results were compared with those of thetraditional sintered NdFeB magnets. It shows that both the SPS NdFeB and the traditional sinteredNdFeB have good corrosion resistance in alkaline environment due to surface passivation; while, thefine grain microstructure of SPS NdFeB results in a more homogeneous phase composition distributionand thus reduces the electrochemical inhomogenity between the ferromagnetic phase and the Nd-richinter-granular phase in the magnet. Therefore, the SPS NdFeB exhibits better corrosion resistancethan the traditional sintered NdFeB in neutral and weak acidic environment.
