Flexible bonding neodymium iron boron magnet and preparation process thereof

Abstract

The invention discloses a flexible bonding neodymium iron boron magnet and a preparation process thereof. The preparation process includes burdening, banburying, smashing and extrusion molding, wherein the burdening includes that raw materials are accurately weighed according to proportion, the raw materials include, by mass, 91.5% of rapid quenching neodymium iron boron magnetic powders, 7% of rubbers and 1.5% of additives, the banburying includes that the weighed raw materials are placed in a banbury mixer for banburying, and the rubber, the neodymium iron boron magnetic powders and other additives are fully mixed and packed through actions of pressure and shearing force, the smashing includes that large-sized materials which are subjected to the banburying are smashed to granules with a diameter of 1-5mm, the extrusion molding is achieved at the temperature between 70DEG C and 100DEG C, and magnetizing is achieved. The flexible bonding neodymium iron boron magnet has a magnetic property and a mechanical property, and widely applied to industrial fields of computer, electric components, communication, micro-motors, sensors, automobiles, aerospace and the like and daily necessities of household appliances, toys and the like.

Description

technical field [0001] The invention relates to the field of permanent magnets, in particular to a flexible bonded NdFeB magnet and a preparation process thereof. Background technique [0002] Bonded magnet is a magnetic body made by adding the prepared magnetic powder into plastic, rubber and other binders for thorough mixing, and then calendering, extrusion molding, injection molding, compression molding and other processes. Rubber NdFeB is a new type of flexible bonded permanent magnet material. It uses rubber-like organic matter as a binder, uses NdFeB powder as a filler, and is equipped with auxiliary processing additives. It is prepared by the production process of rubber products. composite material. This composite material has certain magnetic and mechanical properties, and is easy to process into devices with complex shapes such as flexible bonded magnetic plates, magnetic strips and magnetic rings, so as to meet various requirements. [0003] At present, there ar...

AI Technical Summary

Problems solved by technology

One is that because a large amount of NdFeB powder is filled in the flexible NdFeB, the mechanical properties of the magnet are low, the flexibility of the material becomes poor, the strength is low, and it is easy to break; performance, the magnetic properties of the magnet will be greatly affected

The second is that the surface properties of the NdFeB powder particles and the binder are quite different, so the bonding strength of the direct joint between the two is not high, and the magnetic powder is relatively easy to fall off from the surface of the magnet.

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