A kind of CE-containing sintered magnet and its preparation method

Abstract

The invention discloses a Ce-containing sintered magnet and a preparation method thereof. The Ce-containing sintered magnet is manufactured by dual alloy, the chemical formula is as follows based on percent by mass: [Re<100-x>Ce<x>]Fe<100-a-b-c>BTM<c>Ga<d>, wherein X is more than or equal to 3.5 but less than or smaller than 30, a is more than or equal to 28 but less than or equal to 33, b is more than or equal to 0.8 but less than or equal to 0.91, c is more than or equal to 0.5 but less than or equal to 3.5, d and b are more than or equal to 0.3 but less than or equal to 0.8, Re is a rare-earth element which does not contain Ce, and TM is one or more of Co, Al, Cu, Zr, Ti and Nb. In the Ce-containing sintered magnet, the manufacturing cost of the magnet can be reduced by addition of Ce, the microstructure of the magnet can be improved by matching of each element and a preparation process, the coercivity of the magnet is improved, so that relatively good integral performance isobtained.

Description

technical field [0001] The invention belongs to the field of magnet materials, in particular to a Ce-containing sintered magnet with high coercive force and a preparation method thereof. Background technique [0002] Sintered NdFeB permanent magnet materials have the characteristics of high remanence and high magnetic energy product, and are widely used in electronics, information, energy, transportation and other fields, and are currently the permanent magnet materials with the best market prospects. In recent years, with the rapid development of new energy vehicles and high-efficiency and energy-saving appliances, the demand for rare earth permanent magnet materials is increasing day by day. [0003] Rare earth praseodymium and neodymium are the main elements used in sintered NdFeB. Long-term use not only increases the cost of materials, but also causes an imbalance in the utilization of rare earth resources. The price of metal Ce is less than one-third of that of metal P...

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Problems solved by technology

[0004] Chinese patent CN102800454 proposes to prepare Ce-containing magnets by double alloy method, but the Ce content is relatively high, too much Ce will enter the main phase more, and more low-melting-point Ce will be generated. 2 Fe 14 B main phase, while Ce 2 Fe 14 The magnetic moment Js and anisotropy field HA of B are much lower than those of Nd 2 Fe 14 B, it is easy to grow up during the sintering process, and the coercive force of the prepared magnet is low, which cannot meet the actual requirements for use under certain high temperature conditions

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