Neodymium iron boron magnet permeated by heavy rare earth and method for permeating heavy rate earth on surface of neodymium iron boron magnet

Abstract

The invention provides a neodymium iron boron magnet permeated by heavy rare earth. The neodymium iron boron magnet is obtained by a neodymium iron boron magnet blank of which the surface is compounded by a plating through thermal treatment; the neodymium iron boron magnet blank of which the surface is compounded by the plating comprises the neodymium iron boron magnet, a metal layer compounded onthe surface of the neodymium iron boron magnet and a heavy rare earth layer or a heavy rare earth alloy layer compounded on the surface of the metal layer again. Firstly, the uniform and dense metalplating is formed on the surface of a neodymium iron boron substrate, so that the surface of the substrate is flat and dense, afterwards, a heavy rare earth plating or a heavy rare earth alloy platingis formed on the surface of the metal plating, then metal and heavy rare earth or heavy rare earth alloy is permeated inside the neodymium iron boron substrate in the mode of thermal treatment, and the purpose of improving the coercivity of neodymium iron boron is achieved. The neodymium iron boron magnet blank rare earth layer is high in binding force, the thickness is uniform and consistent, then the neodymium iron boron magnet blank rare earth layer is permeated inside the substrate through high temperature, the magnet performance can be greatly improved, and the magnet performance consistency is well kept; meanwhile, the utilization rate of heavy rare earth can be increased, and the cost is saved.

Description

technical field [0001] The invention belongs to the technical field of magnet preparation, and relates to an NdFeB magnet and a preparation method thereof, in particular to an NdFeB magnet infiltrated with heavy rare earth and a method for infiltrating the heavy rare earth on the surface of the NdFeB magnet. Background technique [0002] NdFeB magnets are rare earth permanent magnets made by sintering materials containing rare earth neodymium, iron and boron. At present, the industry often adopts the sintering method to make NdFeB permanent magnet materials. For example, Wang Wei et al. disclosed the use of sintering method to manufacture NdFeB permanent magnets in "The Influence of Key Process Parameters and Alloy Elements on the Magnetic and Mechanical Properties of Sintered NdFeB". The technological process of materials generally includes the steps of batching, smelting, ingot crushing, powder making, hydrogen crushing, jet mill ultrafine powder, powder orientation pressi...

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Problems solved by technology

However, there are still problems such as uneven thickness of heavy rare earth, poor bonding force, easy fall off of heavy rare earth layer, resulting in poor consistency of magnetic properties of the product

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