Preparation method of anisotropic rare earth magnetic powder and preparation method of bonded magnet

• Main Authors: HUANG DONGYA, LIN BAICHUN, MO MANMAN, PENG HUI, WANG YUE, XIE SHUFENG, YANG SHU, LI ZHONGLI, YANG JUN
• Format: Patent
• Language: Chinese; English
• Published: 19.04.2024
• Subjects: ALLOYS; BASIC ELECTRIC ELEMENTS; CASTING; CHEMISTRY; ELECTRICITY; FERROUS OR NON-FERROUS ALLOYS; INDUCTANCES; MAGNETS; MAKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; METALLURGY; PERFORMING OPERATIONS; POWDER METALLURGY; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; TRANSFORMERS; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WORKING METALLIC POWDER

The invention provides a preparation method of anisotropic rare earth magnetic powder and a preparation method of a bonded magnet. The preparation method of the rare earth magnetic powder comprises the following steps: S1, preparing raw materials according to the atomic percent of the molecular formula R < x > Fe < 100-x-y-z > B < y > M < z >; S2, preparing the HDDR anisotropic rare earth magnetic powder; s3, preparing diffusion source powder; and S4, mixing the prepared HDDR anisotropic rare earth magnetic powder and diffusion source powder, performing magnetic field orientation pre-pressing, and performing grain boundary diffusion treatment and hot pressing deformation treatment. And crushing the obtained anisotropic rare earth magnetic powder, adjusting the granularity, mixing with resin, and preparing the bonded magnet under the action of an oriented magnetic field. According to the method, the grain boundary diffusion technology and the thermal deformation technology are combined, the magnetic powder is