Fe-Ga series magnetostriction material and its producing process

Abstract

This invention relates to a magnetic material. The components of material are Fe100-x-yGaxMyQ where x=10-40, M is Al, Be, Cr, In, Cd, Mo, Ge, y=0-15, Q is C, N, O additional doping. Main points of its technique are according to the requirement of the invented material components to smelt the mother alloy in a magnetic suspension over or vacuum induction furnace, to process monocrystal or polycrystal oriented materials with the high-temperature gradient quick directional solidification or czochralski or Bridgeman method under 1000-1200 deg.C for 1-48 hours then cool to 750-600 deg.C in the furnace and keep temp. for 0.2-48 hours, then quenching with water, or cool furnace to room temperature with different cooling speed for 750 to 600 deg.C or apply 500-20000 e magnetic field in the cooling process.

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 ferromagnetic substance changes its magnetization state, its own length also changes slightly. This phenomenon is called magnetostriction. The amount of magnetostriction is represented by the magnetostriction coefficient λ, which is defined as λ=Δl / l (1 is the original length of the material sample, and Δl is the change of the sample when the magnetization state changes), and the practical traditional magnetostrictive material is Ni And Fe-based alloys, λ is generally around 40-100ppm (1ppm=10 -5 ), because the λ of this type of material is too small, the scope of use is limited. Later, people invented a kind of electrostrictive material, which is usually called piezoelectric ceramic (PZT) material. Although the λ of this material is relatively high, which can r...

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Problems solved by technology

However, this rare earth giant magnetostrictive material also has its disadvantages. One is that the material is relatively brittle, and the processing means are limited and the processing cost is high. The second is that the cost of raw materials is very high, so the sales price of this material is expensive. Its working magnetic field is also high (greater than 400 Oe), which increases the number of auxiliary equipment, so its application and promotion are greatly hindered