High-performance strontium permanent magnetic ferrite preparation method

Abstract

The invention discloses a high-performance strontium permanent magnetic ferrite preparation method. The method comprises 1, adding nanometer bismuth oxide, nanometer cobaltous oxide, nanometer zinc oxide and nanometer germanium oxide into nanometer strontium carbonate, nanometer ferric oxide, nanometer calcium carbonate and nanometer silica as raw materials, and carrying out sanding, 2, carrying out pre-sintering, 3, adding nanometer lanthana oxide, nanometer cerium oxide, nanometer gadolinium oxide, nanometer bismuth oxide, nanometer cobalt oxide, nanometer germanium oxide, nanometer zinc oxide, a grain boundary modifier, a dispersant, a coupling agent, nanometer cesium carbonate, nanometer aluminum oxide, nanometer calcium carbonate and nanometer silica into the pre-sintered product, carrying out mixing to obtain a uniform mixture, replacing strontium by lanthanum, cerium, gadolinium and bismuth, replacing iron ions by cobalt, zinc or germanium and carrying out sanding, 4, carrying cooling molding, and 5, carrying out sintering in a combustion furnace. The method greatly improves permanent magnetic ferrite saturation magnetization, magnet coercive force, remanent magnetism and stability.

Description

technical field [0001] The invention relates to a high-performance process method of strontium permanent magnet ferrite. Background technique [0002] The existing preparation technology and processing technology of permanent magnet ferrite are almost mature and perfect, and it is very difficult to improve the magnetic properties through traditional preparation technology. In recent years, people have tried to achieve various ion substitutions by doping or combined doping to change the intrinsic properties of magnetic materials such as exchange function and magnetocrystalline anisotropy, so as to improve the magnetic properties and physical properties of materials. The existing technology It is the use of La and Co for Sr and Fe in the M-type ferrite lattice 3+ Partial replacement, or use La and Zn for Sr and Fe in the M-type ferrite lattice 3+ Partial substitution is performed, thereby increasing the saturation magnetization M of the magnet s , but La and Zn have an effe...

AI Technical Summary

Problems solved by technology

[0002] The existing preparation technology and processing technology of permanent magnet ferrite are almost mature and perfect. It is very difficult to improve the magnetic properties through traditional preparation technology.

In recent years, people have tried to achieve various ion substitutions by doping or combined doping to change the intrinsic properties of magnetic materials such as exchange function and magnetocrystalline anisotropy, so as to improve the magnetic properties and physical properties of materials. The existing technology It is the use of La and Co for Sr and Fe in the M-type ferrite lattice 3+ Partial replacement, or use La and Zn for Sr and Fe in the M-type ferrite lattice 3+ Partial substitution is performed, thereby increasing the saturation magnetization M of the magnet s , but La and Zn have an effect on Sr and Fe in the M-type ferrite lattice 3+ Partial substitution will result in magnet coercive force H cj decline

The residual magnetic force B of the existing permanent magnet ferrite r low, its coercive force H cj low temperature coefficient