▎ 摘　　要

NOVELTY - A high-frequency low-hysteresis manganese-zinc soft ferrite material comprises 60-90 pts. wt. anisotropic neodymium iron boron magnetic powder, 5-40 pts. wt. anisotropic samarium cobalt magnetic powder, 0.5-15 pts. wt. anisotropic strontium ferrite magnetic powder, 20-25 pts. wt. iron oxide, 15-25 pts. wt. bismuth oxide, 12-17 pts. wt. nickel oxide, 10-17 pts. wt. titanium oxide, 11-17 pts. wt. silicon dioxide, 4-7 pts. wt. niobium oxide, 4-6 pts. wt. tantalum oxide, 13-19 pts. wt. graphene, 8-11 pts. wt. epoxy resin, 3-5 pts. wt. manganese oxide, 2.5-3.5 pts. wt. cobalt oxide, 12-14 pts. wt. calcium carbonate, 2-3 pts. wt. dispersant, 5-7 pts. wt. adhesive, 1-2 pts. wt. wetting agent, 13-17 pts. wt. polyvinyl alcohol, 0.5-0.7 pt. wt. cetyltrimethylammonium bromide, 0.1-0.3 pt. wt. polydimethyl siloxane, 0.6-0.8 pt. wt. magnesium stearate, and 75-85 pts. wt. water. USE - A high-frequency low-hysteresis manganese-zinc soft ferrite material. ADVANTAGE - The material has good temperature stability, low hysteresis loss, and high initial magnetic permeability, and is conducive to reducing waveform distortion during signal transmission, reducing transmission errors, extending transmission distances, and resolving the high-frequency transmission delay problem. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing high-frequency and low-hysteresis manganese-zinc soft ferrite material which involves powder preparation, bonding magnetic powder preparation, warm-pressing molding, primary demagnetization, cooling and demolding, and secondary demagnetization and solidification steps, where a given mold is used in the warm press forming process of junction magnet, powder preparation includes weighing 60-90 pts. wt. anisotropic neodymium iron boron magnetic powder with a particle size of 30-240 mu m and particles with a particle size of less than or equal to 80 mu m, 5-40 pts. wt. anisotropic samarium-cobalt magnetic powder and 0.5-15 pts. wt. anisotropic strontium ferrite magnetic powder with a particle size of less than or equal to 10 mu m, putting into a mixer and mixing to obtain mixed magnetic powder; preparing bonded magnetic powder by weighing 100 pts. wt. mixed magnetic powder, adding 0.5-10 pts. wt. thermosetting resin and 0.01-3 pts. wt. zinc stearate, and stirring uniformly at room temperature to 120 degrees C to obtain bonded magnetic powder; where the thermosetting resin is a bisphenol A ring resin, or phenolic type epoxy resin, or thermosetting phenolic resin; warm press molding by putting the prepared bonded magnetic powder into a mold, and at a positive magnetic field strength of 10 kg and at 60-180 degrees C, subjecting bonded magnetic powder to warm press molding, where the pressure of warm press molding is controlled at 200-500 MPa, and holding time of the warm press molding is controlled at 0.1-60 s, and obtaining bonded magnet in the mold; demagnetization by demagnetize the bonded magnet with reverse magnetic field, with intensity of reverse magnetic field is controlled at 1-20 kg; cooling and demolding by cooling the bonded magnet after one demagnetization, and cooling adopts air cooling or water cooling for 5-10 s, where the bonded magnet is ejected from mold for demolding, and the demolding time is controlled within 10-180 s; secondary demagnetization curing by putting in oscillating pulsed magnetic field for secondary demagnetization where the maximum peak strength of oscillating pulsed magnetic field is greater than or equal to 20 kg, and the maximum surface magnetism of bonded magnet is less than or equal to 50 g, placing the bonded magnet in an oven and curing at 100-180 degrees C for 0.5-2 hours to prepare the magnet.