Combing with the industrial production of sintered Nd-Fe-B magnet in China, the effects of different sintering temperatures and tempering heat treatment temperatures on the product magnetic property and demagnetization curve square degree after pressure molding of the same Nd-Fe-B powder were studied.

A quantitative description of variation of the demagnetization curve rectangularity of Nd-Fe-B magnets with sintering process and a study of the effect of relative density, grain size and its distribution on the demagnetization curve rectangularity of Nd-Fe-B magnets are presented in this paper.

The densification process and mechanism in sintered Nd-Fe-B magnets have been investigated in thispaper.