A sinter process for permanent magnet with high mechanical strength

Abstract

A technology for sinter permanent magnet with high mechanical strength comprises the following steps: S1, proportioning: taking rare earth element, iron, titanium, cobalt and ferroboron alloy as raw materials, weighing each raw material according to the following mass percentage: rare earth element 25%-35%, titanium 0.49%-0.51%, cobalt 0.58%-0.62%, boron 0.77%-1.28%, and the balance of iron and other inevitable impurities; S2, smelting: Put the raw material selected in S1 in FMI-I-500R vacuum smelt slab casting furnace, adopt rapid solidification process under vacuum degree of less than 10Pa,and then prepare that required rapid solidification slab; S3, hydrogen crushing: firstly, put the quick-setting piece prepared in S2 into the hydrogen crushing cylinder, then open the furnace door, clean the furnace chamber with a vacuum cleaner, remove the cylinder fixing pin, and put the hydrogen crushing cylinder into the furnace chamber with a charging truck. Compared with other passivation processes, the passivation process is simple and easy to control, and the corrosion resistance can be enhanced by forming a dense passivation film on the surface of the permanent magnet.

Description

technical field [0001] The invention relates to the technical field of permanent magnet materials, and more specifically relates to a high mechanical strength permanent magnet sintering process. Background technique [0002] Semi-sintered NdFeB permanent magnet material belongs to the third generation rare earth permanent magnet material. Compared with other types of permanent magnet materials, it has the outstanding advantages of high magnetic performance and low price, which makes its development and application have achieved extraordinary development. At present, its comprehensive magnetic performance has reached a high level, and its application has involved various fields of the national economy, especially in computer, information, automobile, nuclear magnetic resonance imaging, CD-ROM, DVF and other industries. [0003] However, semiconductors have strict requirements on the working environment. If the semiconductor is not packaged, it will inevitably cause damage to ...

AI Technical Summary

Problems solved by technology

[0003] However, semiconductors have strict requirements on the working environment. If the semiconductor is not packaged, it will inevitably cause damage to the semiconductor and cause the semiconductor to fail to work normally. However, the traditional semiconductor packaging level cannot meet the chip-level packaging standard, and the protection of semiconductors is not enough. Very in place, for this reason, we propose a high mechanical strength permanent magnet sintering process