Method for sintering Mn-Zn ferrite with high density and high saturation induction density

The invention discloses a method for sintering an Mn-Zn ferrite with high density and high saturation induction density, belonging to the technical field of preparing soft-magnetic ferrites, comprising a heating stage, a heat preservation stage, and a cooling stage, wherein the heating stage is characterized by letting a ferrite blank pass through Zone One, Zone Two and Zone Three of a kiln successively, heating up to 1050 DEG C with the heating rate of 80-150 DEG C/h in the Zone One, heating up to 1150 DEG C with the heating rate of 70-100 DEG C and simultaneously letting in nitrogen in the Zone Two, and heating up to 1300-1350 DEG C with the heating rate of 120-180 DEG C /h and controlling the oxygen partial pressure; the heat preservation stage is characterized by preserving heat at 1300-1350 DEG C; and the cooling stage is characterized by cooling from 1300-1350 DEG C to 1000 DEG C with the cooling rate of 80-120 DEG C/h, and then cooling from 1000 DEG C to 150 DEG C with the cooling rate of 120-200 DEG C/h, and then discharging. The method has the advantages of raising the density, initial magnetic permeability and saturation magnetic flux density, saving energy, and reducingthe nitrogen consumption.