A kind of anisotropic smco5 type rare earth permanent magnet material and its preparation method

Abstract

The invention discloses an anisotropic SmCo<5> type rare earth permanent magnet material and a preparation method therefor. The permanent magnet material comprises the following components with the general formula as follows: SmCo<5-x>C<x> or Sm(Co<1-y>M<y>)<5-x>C<x>, where y is greater than or equal to 0.01 and less than or equal to 0.3; x is greater than or equal to 0.02 and less than or equal to 2; M is selected from one or more of metals Fe, Ni, Cr, Cu, V, Ti, Zr, Mn, W or Mo; the preparation process comprises the steps of preparing materials, smelting and performing rapid quenching on melt, wherein the step of rapid quenching on the melt is performed by a vacuum melt-spinning machine with the copper roller rotary speed V of greater than or equal to 40m / s. The rare earth permanent magnet material is reasonable in component matching, and capable of effectively improving degree of supercooling of the alloy component system; the preparation process is simple, and the easily magnetized axis, namely, a C axis, of the prepared anisotropic SmCo<5> nanocrystal permanent magnet material is perpendicular to the surface of a thin strip, and a structure of preferential growth is formed on the C axis; therefore, the alloy has excellent magnetic performance in a direction perpendicular to the thin strip, the crystal particles are fine and small, and the alloy is high in remanent magnetization strength, coercivity, magnetic energy product and the Curie temperature; and the use temperature of the temperature can be effectively improved, so that the rare earth permanent magnet material is suitable for industrial application.

Description

technical field [0001] The invention discloses a rare earth permanent magnet material and a preparation method, in particular to an anisotropic SmCo 5 Type rare earth permanent magnet material and preparation method. It belongs to the technical field of permanent magnet materials. Background technique [0002] SmCo 5 Rare earth permanent magnet materials have high magnetic properties and high Curie temperature, especially when the working temperature is above 180-250°C, the magnet still has high magnetic energy product, coercive force and remanence, so it is widely used in aerospace , national defense and military industry, microwave devices, communications, medical equipment, instrumentation, wind power generation, various magnetic transmission devices, sensors, magnetic processors, high-end motors and other industries. The phase structure of the alloy is SmCo 5 Phase (i.e. 1:5 phase), CaCu 5 type of hexagonal structure with strong uniaxial magnetocrystalline anisotrop...

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Problems solved by technology

[0006] (1) Only the texture with the easy magnetization axis along the belt surface can be formed, which is not conducive to the formation of high orientation degree of subsequent bonded magnets or sintered magnets;

[0007] (2) The rapid quenching speed is low, and the grain size of the obtained material is coarse, so that the coercive force of the alloy is low

[0008] (3) The undercooling degree of the existing composition system is small, and the texture perpendicular to the direction of the belt surface cannot be formed. Even at a high quenching speed (>25m / s), due to the insufficient undercooling of the belt surface, the belt The in-plane texture disappears

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