Effect of Adding Pr-Cu Alloy Nano-powder at Grain Boundary on Magnetic Properties and Corrosion Resistance of Sintered NdFeB
In order to improve the magnetic properties and corrosion resistance of NdFeB magnet,Pr-Cu alloy nano-powders were firstly obtained by plasma arc method,and then high performance sintered NdFeB magnets were obtained by the binary alloy method.The microstructure,magnetic properties and corrosion resistance of magnets were characterized by X-ray diffractometer(XRD),scanning electron microscope(SEM),vibrating sample magnetometer(VSM),electrochemical workstation,and constant temperature and humidity box.The results showed that the coercivity of the magnet increased from 959.1 kA·m-1 to 1 080.5 kA·m-1 by 12.6%when mass fraction 0.6%Pr-Cu alloy powder was added.The remanence decreased by 9.1%from 1.24 T to 1.13 T.In addition,the corrosion resistance of magnets was obviously improved,and the corrosion current density of magnets decreased from 62.0 mA·cm-2 to 22.0 mA·cm-2.The mass loss of the magnet was 4.5 mg·cm-2 after 96 h of the weightless corrosion experiment at 0.2 MPa,120℃and 100%relative humidity,which was only 26.5%of that without addition.It is feasible to improve the properties of sintered NdFeB magnets by adding Pr-Cu alloy nano-powder.
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