High specific resistance magnetic striction composite material and preparation

Abstract

The invention provides a high-resistivity supermagnetostrictive composite material and a method of preparing the same and relates to the components of supermagnetostrictive material and a manufacturing process. The composite material consists of a powdered alloy and a binder, wherein, the component of the powdered alloy is Fe1-x and x is 10-30at%, the binder is a non-metal material. The method comprises steps of smelting the master alloy according to the component of the material, pulverizing the master alloy into powder with the granularity from micrometer to hundreds of micrometers by using gas flow grinding, air atomizing or other methods; mixing the obtained power with a certain amount of binder uniformly, then pressing the mixture for forming.The composite material prepared by a powdered alloy and a binder through an agglutinating technique has a high resistivity which can be up to 48.8 omega*m and a high supermagnetostrictive value and the maximum supermagnetostrictive coefficient can be over 130*10 6.

Description

Technical field: [0001] The invention belongs to the field of magnetic materials and relates to the composition and manufacturing process of a novel magnetostrictive material. Background technique: [0002] When a ferromagnet is magnetized in an external magnetic field, its length and volume change. This phenomenon is called magnetostriction or magnetostriction effect. The amount of magnetostriction is represented by the magnetostriction coefficient λ, which is defined as λ=ΔL / L (L is the original length of the material sample, and ΔL is the change of the sample when the magnetization state changes). There are generally three main categories of magnetostrictive materials: (1) magnetostrictive metals and alloys, such as nickel-based alloys (Ni, Ni-Co, Ni-Co-Cr, etc.) and iron-based alloys (Fe-Ni, Fe -Al, Fe-Co-V, etc.); (2) ferrite (Ni-Co, Ni-Co-Cu ferrite materials, etc.) magnetostrictive materials, these two are called traditional magnetostrictive materials; ( 3) Rare ear...

AI Technical Summary

Problems solved by technology

However, the above several processes are all pure metal materials, and the resistance of the materials is relatively small.

The closed conductor is in an alternating magnetic field. The alternating magnetic flux causes an induced current in the closed conductor to form an eddy current. If the conductor is pure metal, the eddy current generated is very large due to the small resistance, resulting in eddy current loss.

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