High-remanence low-coercivity permanent magnetic material and preparation method thereof

Abstract

The invention belongs to the field of magnetic materials, and in particular relates to a high-remanence low-coercivity permanent magnetic material and a preparation method thereof. The material has the atomic components shown as RxFe100-x-y-a-b-cAlaCubSicBy, wherein x is 4 to 4.5; y is 18 to 19.5; a is not zero and is no more than 1.5; b is not zero and is no more than 0.8; c is not zero and no more than 1.4; R is rare-earth element; and Fe, Al, Cu, Si and B respectively refer to iron, aluminum, copper, silicon, boron elements. The material consists of ultra-fine crystals of which the main phase is a mixture of three metal phases, namely R2Fe14B, Fe3B and alpha-Fe, wherein iron atoms are substituted by Al, Cu and Si atoms compositely. The permanent magnetic material prepared by the invention has more outstanding characteristics of high remanence and low coercivity.

Description

(1) Technical field

[0001] The invention belongs to the field of magnetic materials, in particular to a permanent magnet material with high remanence and low coercive force and a preparation method thereof. (2) Background technology

[0002] Magnetic powder has a high degree of freedom and can be made into any shape, so it is widely used in the manufacture of special-shaped and special-shaped bonded magnets.

[0003] In the metal iron melt with low rare earth and high boron, it contains a large amount of α-Fe phase and Fe 3 Phase B and Product R 2 Fe 14 Phase B, due to the α-Fe phase and the Fe 3 The existence of a large number of B phases greatly strengthens the metal bond and covalent bond, and shows strong hardness to the outside, so it becomes very difficult to break the alloy ingot by traditional physics. In addition, the formula of the traditional preparation process tends to produce magnetic powder with high coercive force and high magnetic energy accumulation. Ho...

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