A process for preparing magnetostrictive materials by directional crystal melting

Abstract

The invention discloses a process for preparing a magnetostrictive material by a directional crystal zone melting method, and belongs to the technical field of magnetostrictive materials. In the process for preparing the magnetostrictive material by the directional crystal zone melting method, the following components are adopted: 99% of high-purity rare earth element Tb and Dy materials, Fe, Co,Al, Mn element materials with purity being 99% or above and a bulk silicon polycrystalline material. A preparation process comprises the following steps: pre-mixing alloy raw materials, and smelting in an induction furnace; casting a rod under vacuum, and directionally growing crystals; and separating and shaping, and after the zone melting directional solidification is finished, carrying out heattreatment on the formed oriented crystal to obtain a finished magnetostrictive material. A special device can be added into the induction furnace, and the magnetostrictive material is heated in sections, so that the magnetostrictive material in the furnace is heated in a gradient mode. Therefore, the mechanical strength of the magnetostrictive material is improved, and the stability and reliability of the magnetostrictive material are enhanced. The magnetostriction performance of the magnetostrictive material does not change greatly with time.

Description

technical field [0001] The invention relates to the technical field of magnetostrictive materials, more specifically, to a process for preparing magnetostrictive materials by directional crystal region melting. Background technique [0002] Magnetostrictive materials are a class of materials with the mutual conversion function of electromagnetic energy and mechanical energy. Rare earth-iron alloy (RFe2) materials with giant magnetostrictive properties at room temperature, which began to appear in the 1970s, have high energy density, large coupling coefficient, and sensing and driving functions, so they are used as smart materials or corresponding devices in the field of smart materials. Has been more and more widely used and developed. This feature is used in engineering to convert electrical energy into mechanical energy or convert mechanical energy into electrical energy. Magnetostriction means that under the action of alternating magnetic field, the object produces mech...

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Problems solved by technology

[0004] In the preparation process of existing magnetostrictive materials, the preparation methods selected include zone melting method, single crystal drawing method, columnar crystal solidification method, etc., and the zone melting method is the most commonly used because of the relatively simple procedures in the preparation process. However, in the process of preparing magnetostrictive materials by zone melting method, in the long single crystal process, the temperature in the induction furnace changes rapidly, and during the temperature change process, the temperature of the raw materials in the section that is not in direct contact with the inner wall of the induction furnace rises unevenly, which is easy to Cracks appear inside the magnetostrictive material, which reduces the mechanical strength of the magnetostrictive material, and the stability and reliability cannot be guaranteed, which affects the toughness and ductility of the magnetostrictive material, thereby limiting the scope of application of the magnetostrictive material

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