A kind of preparation method of sintered NdFeB device

Abstract

The invention discloses a method for preparing a sintered neodymium iron boron device. The method comprises the following steps of: forming a groove on a substrate which is suitable for the sintered neodymium iron boron device, placing a nickel alloy foil into the groove, manufacturing a surrounding frame which has a shape matched with that of the substrate and has a cavity, placing the substrate into the bottom of the cavity in a mode that the groove surface of the substrate faces the upside so as to obtain a material disk which is formed by combining the substrate and the surrounding frame, filling neodymium iron boron fine powder in the cavity, compacting, orienting, sintering, cooling, removing the surrounding frame, postprocessing and the like, and thus obtaining the neodymium iron boron device at one time. The method has the advantages that: the neodymium iron boron device consisting of a sintered neodymium iron boron magnet and the substrate can be obtained at one time, and the procedures are simple; and the sintered neodymium iron boron magnet and the substrate are taken as the integral neodymium iron boron device to be machined in the preparation process, so that machining allowance is lowered, neodymium iron boron raw materials are saved, the strength of the sintered neodymium iron boron magnet is improved, the neodymium iron boron magnet is prevented from being broken, raw materials are saved, and production cost is lowered.

Description

technical field [0001] The invention relates to a sintered NdFeB device, in particular to a preparation method for a sintered NdFeB device. Background technique [0002] Sintered NdFeB magnets have excellent magnetic properties and are widely used in many technical fields such as electronics, automobiles, computers, electric power, machinery, energy, environmental protection, national defense and medical equipment; when applied, sintered NdFeB magnets generally match the shape The substrate is bonded together to form a sintered NdFeB device. The preparation method of the sintered NdFeB device is as follows: firstly, a sintered NdFeB magnet matching the shape of the substrate is produced, and then the sintered NdFeB magnet and the substrate are bonded together to obtain Sintered NdFeB devices; Sintered NdFeB magnets are mainly made of rare earths such as neodymium and praseodymium needed for the synthesis of NdFeB, pure iron, ferroboron and a small amount of copper, aluminum ...

AI Technical Summary

Problems solved by technology

[0003] With the development of science and technology, technology products using sintered NdFeB devices tend to be smaller and lighter, and correspondingly, the size and specifications of sintered NdFeB devices are also getting smaller and smaller. When preparing sintered NdFeB devices with relatively small specifications, not only will there be material loss due to the machining allowance, but also because the blank of the sintered NdFeB magnet is relatively thin after being sliced ​​and is a powder metallurgy brittle material, the thin-sheet sintered NdFeB Boron magnets collide with each other and are prone to missing corners, resulting in defective products being scrapped, wasting raw materials and increasing costs

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