Patent ID: 11958779
Assignee: TDG HOLDING CO., LTD
Field: Materials, metallurgy (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 1:
2. A preparation method of the MnZn ferrite material according to claim 1, comprising the following steps:
(1) preparing the principal components Fe2O3, MnO, and ZnO according to a proportion of the principal components, mixing the principal components through one-time grinding to obtain a uniform mixed powder, and conducting pre-sintering to obtain at least two portions of MnZn ferrite pre-sintered materials with a spinel structure and an activity span by changing pre-sintering conditions; wherein the pre-sintering of each portion of MnZn ferrite pre-sintered material is conducted for 2 h to 3 h at a temperature between 700° C. and 1,000° C. and an oxygen content controlled at 5 vol % to 20 vol % by controlling a ratio of air to nitrogen;
(2) thoroughly mixing the at least two MnZn ferrite pre-sintered materials obtained under different pre-sintering conditions in a specified ratio to obtain a mixed material;
(3) adding the auxiliary components designed according to a proportion of the auxiliary component to the mixed material, and further grinding to a particle size D50 of 1.2 μm to 1.6 μm; during which deionized water was added in a deionized water-raw material ratio of 5:4 to obtain a slurry;
(4) drying the slurry obtained from the grinding, adding 15% PVA, and conducting granulation; sieving a granulation powder to remove unevenly-granulated particles, and drying the granulation powder at 100° C. to 150° C. for 10 min to 20 min to obtain a powder with prominent flowability and filling property; and pressing the powder into a green body ring having a size of 25*15*8 mm under a pressure of 300 MPa to 350 MPa; and
(5) subjecting the green body ring obtained in step (4) to sintering in a bell furnace to obtain a MnZn ferrite sample ring.