magnetic properties

作者:胡志华;储林华;李军;刘颖;
关键词:Nd-Fe-B magnets; magnetic properties; the die-upset level;

deformation temperature; spark plasma sintering; rare earths
单位:Department of Materials Engineering, Hubei University of

Automotive Technology;College of Materials Science and

Engineering, Sichuan University;
摘要:The magnetic properties and http://www.999magnet.com/products/125-Magnetic-Separator microstructure of Nd-Fe-B

magnets prepared by spark plasma sintering with different die-

upsetting processes were investigated. The results showed that

the optimum magnetic properties of die-upset Nd-Fe-B magnets were

obtained at 680 ℃ when the die-upset level was 60%, and the

degree of magnetic alignment was 0.84. The microstructures showed

that the coarse grains oc-curred predominantly within certain

areas, and abnormal grain growth was not observed within the

major areas of well-aligned grains. There existed many small

spherical grains, which stacked together and were not aligned

during die upsetting when the deformation temperature was 650 ℃.

These small spherical grains grew up, and were aligned when the

deformation temperature increased from 650 to 680 ℃, which could

improve the crystallographic alignment of die-upset Nd-Fe-B

magnets.