Rare earth permanent magnet produced by applying abundant rare earth cerium (Ce) and preparation method thereof

Abstract

The invention discloses a rare earth permanent magnet produced by applying abundant rare earth cerium (Ce) and a preparation method of the rare earth permanent magnet produced by applying abundant rare earth Ce. Based on a double-alloy process, main phase alloy formula uses Ce to partly replace neodymium (Nd), an optimized composition design enables a main alloy to form Ce2Fe14B phase and Nd2Fe14B phase to a greatest extent, and therefore high intrinsic magnetic property is guaranteed. A brand new crystal boundary phase is prepared by a crystal boundary reconstitution technology, and high integral magnetic property and corrosion resistant property are guaranteed, and meanwhile a nanometer powder crystal modification method is supplemented, a micro organization structure of a magnet is optimized, crystal boundary distribution is improved, and the magnetic property and the corrosion resistant property are further improved. By applying abundant rare earth cerium, cost is effectively reduced, and meanwhile balance between production and marketing is promoted. Praseodymium (Pr), Nd, and the like are chosen to form a hard magnetic shell layer of a main phase boundary in a composition design of crystal phase auxiliary alloy at the same time, compared high price heavy rare earth elements of dysprosium (Dy) and terbium (Tb) with the elements, and cost control can be further achieved.

Description

technical field [0001] The invention relates to the field of rare earth permanent magnet materials, in particular to a rare earth permanent magnet produced by using high-abundance rare earth Ce and a preparation method thereof. Background technique [0002] The third-generation rare-earth permanent magnet material NdFeB has a high magnetic energy product unmatched by other permanent magnets, so it is known as the "king of permanent magnets" and is an indispensable strategic functional material in various fields of military and civilian in modern society. From 1996 to 2008, the global output of sintered NdFeB increased from 6,000 tons to 63,000 tons, maintaining an average annual growth rate of nearly 10% (Yang Luo. Proc. 20 th Int. Workshop on Rare Earth Permanent Magnets and Their Applications . 2008, 27). Taking 2010 as an example, the market share of NdFeB in the world's permanent magnets reached 62% (the statistics are provided by the US Magnetic Materials Association)....

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Problems solved by technology

Among them, neodymium and praseodymium elements are important raw materials for NdFeB magnets, which are widely used in the manufacture of rare earth permanent magnets. The supply chain is in a state of short supply and the price is high; however, as the content of Ce is close to half of the rare earth ore. However, it is mainly used in limited occasions such as various catalysts, so the long-term oversupply is a slow-moving product in the market

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