Preparation method of composite rare earth permanent magnet material and anti-oxidation mixing equipment

Abstract

The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation method of a composite rare earth permanent magnet material and anti-oxidation mixing equipment. Compared with the prior art, the preparation method disclosed by the invention is reasonable in design, has relatively high coercive force, compressive strength, residual magnetism and magnetic energy product, and solves the problem that the anti-oxidation efficiency is low when an existing method is used for powder preparation and mixing processes.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet materials, in particular to a preparation method of a composite rare earth permanent magnet material and anti-oxidation mixing equipment. Background technique [0002] Magnetic material, that is, a strong magnetic substance, is an ancient and widely used functional material, and the magnetism of the substance has been recognized and applied by people as early as 3000 years ago. For example, in ancient China, natural magnets were used as compass, and permanent magnet materials were used as An important part of magnetic materials, it plays an important role in the electronics industry, information industry, motorcycles, electric tools, automobile industry and other industries; it has been widely used in computers, mobile communications, advanced audio-visual equipment, micro-motors, sensors and magnetic Electrical instrumentation, office equipment, electronic clocks, electronic c...

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Problems solved by technology

[0004] At the same time, the following process methods are usually used in the preparation of the above-mentioned composite rare earth permanent magnet materials: batching, smelting, hydrogen crushing, jet milling, mixing, and molding. There are rare metals in the material, which are often easily oxidized or spontaneously ignited in the air during the pulverization and mixing process. Therefore, it is necessary to continuously fill inert gas for protection during the pulverization and mixing process. Existing technology has the following problems for the anti-oxidation treatment in the milling and mixing processes: first, in the prior art, the milling and mixing processes are often divided into two steps, which is time-consuming, laborious and costly

Second, in order to prevent the rare earth permanent magnet materials from being oxidized during the preparation process, the existing anti-oxidation measures are often to prevent the permanent magnet materials and other formulas from entering the powder making barrel or mixing barrel from being mixed with the powder making barrel or mixing To mix the residual air in the cylinder, it is necessary to continuously fill inert gas through the filling port provided on the upper end of the powder cylinder or the mixing cylinder, and then push out the residual air, but the problem with this method is that it will push out the air At the moment of completion, a large amount of inert gas will be discharged into the air, which will easily affect the environment while wasting resources; at the same time, in the process of milling and mixing, in the prior art, in order to prevent the mixing of raw materials during milling and mixing Oxidation reaction occurs in the air mixed in, and inert gas is often filled in the powder barrel or mixing barrel for anti-oxidation, but the circulation flow of the filled inert gas cannot be guaranteed in the prior art, and it is difficult for the static inert gas to be effective. Into the interior of the raw material to prevent the oxidation of the raw material, resulting in low anti-oxidation efficiency

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