Preparation method of strontium ferrite magnetic powder and injection magnetic powder containing strontium ferrite magnetic powder

• Main Authors: WANG JINGLIE, ZHOU YUEDE, YANG TIANBO, LOU WANGYONG, SONG YANGJIE, YUAN YUKAI, KIM HO-GYUN, LIAN JIANGBIN, MA XIAOWEI
• Format: Patent
• Language: Chinese; English
• Published: 04.04.2023
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; REFRACTORIES; SLAG; TREATMENT OF NATURAL STONE

The invention relates to the technical field of injection magnetic powder, and discloses a preparation method of strontium ferrite magnetic powder and injection magnetic powder containing the strontium ferrite magnetic powder. Pre-sintering is performed; adding nitroxide free radical modified oleic acid for ball milling modification; rolling is conducted; sintering is performed; and adding a grinding aid for vibration grinding. The injection magnetic powder is prepared by mixing large-particle powder A and small-particle powder B, the particle size distribution is as follows: D50 is 2.3-3.0 [mu] m, D90 is 8.5-9.5 [mu] m, and the average particle size is 3.3-5 [mu] m; the span value of the particle size distribution is 3.0 to 3.35. The orientation degree and morphology of the large-particle strontium ferrite magnetic powder are improved through the steps of ball milling modification and vibration milling, the large-particle strontium ferrite magnetic powder is mixed with the small-particle strontium ferrite ma