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A kind of preparation method of high coercivity fe-pt alloy

A high coercive force, alloy technology, applied in the field of preparation of high coercive force Fe-Pt alloy, can solve the problem of less magnetic materials and achieve the effect of short process flow

Active Publication Date: 2017-11-07
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the dealloying method is mainly used to prepare nanoporous materials in the fields of catalysis, sensing and biomedicine, and less used to prepare magnetic materials.

Method used

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  • A kind of preparation method of high coercivity fe-pt alloy
  • A kind of preparation method of high coercivity fe-pt alloy
  • A kind of preparation method of high coercivity fe-pt alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: Now take composition as Fe 60 Pt 20 B 20 Taking the quenched alloy strip as an example, the implementation of the preparation and performance testing of the permanent magnetic Fe-Pt alloy will be described in detail in conjunction with the accompanying drawings.

[0021] The first step is to prepare the precursor alloy strip:

[0022] 1.1 Select high-purity Fe (99.9wt.%), Pt (99.95wt.%) and B (99.5wt.%) raw materials according to Fe 60 Pt 20 B 20 (atomic percent) ingredients are weighed for batching.

[0023] 1.2 Alloy ingot melting

[0024] Mix the weighed metal raw materials into the water-cooled copper crucible of the arc melting furnace, and evacuate to 6×10 -3 Pa, and then filled with an appropriate amount of argon to start melting the alloy. After melting, the alloy ingot was turned upside down and smelted repeatedly 4 times to obtain Fe with uniform composition. 60 Pt 20 B 20 alloy ingot.

[0025] 1.3 Preparation of quenched strip samples...

Embodiment 2

[0041] Embodiment 2: the precursor alloy is Fe 65 Pt 15 B 20 quench strip

[0042] The specific implementation steps are the same as in Example 1, the corrosion solution in the second step 2.2 dealloying treatment is a sulfuric acid solution with a concentration of 0.1mol / L, the constant potential voltage is -120mV, and the annealing temperature in the third step 3.1 is 670°C. The time is 900s, the linear speed of the roller surface is 35m / s in the process of single-roller stripping, and the final obtained alloy i h c , M s and M r They are: 7.69kOe, 46.05emu / g and 33.63emu / g.

Embodiment 3

[0043] Embodiment 3: the precursor alloy is Fe 65 Pt 20 B 15 quench strip

[0044] The specific implementation steps are the same as in Example 1, the corrosion solution in the second step 2.2 dealloying treatment is a sulfuric acid solution with a concentration of 0.01mol / L, the constant potential voltage is -110mV, and the annealing temperature in the third step 3.1 is 670°C. The time is 600s, the linear speed of the roller surface is 40m / s in the process of single-roller stripping, and the final alloy obtained i h c , M s and M r They are: 7.48kOe, 48.28emu / g and 35.63emu / g.

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Abstract

The invention relates to a preparation method of a high-coercivity Fe-Pt alloy, which belongs to the technical field of new materials. Fe-Pt-B alloy strips with low Pt content were prepared by arc or induction melting and single-roller stripping as precursor alloys, and then prepared by dealloying the precursor alloy strips in a weakly acidic environment by electrochemical process The nanoporous Fe-Pt alloy with uniform pore size is then subjected to vacuum annealing treatment, and the hard magnetic L10-FePt phase is obtained through phase transformation, so that the alloy has high coercive force. The coercive force of the Fe-Pt alloy prepared by the method provided by the invention exceeds 6.12kOe under an external magnetic field of 18kOe, which is much higher than that of the Fe-Pt alloy prepared by the traditional method. The invention provides a new method for the preparation of the permanent magnetic material, and also opens up a new application field for the nanoporous metal material.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a preparation method of a high-coercivity Fe-Pt alloy. Background technique [0002] With ordered face-centered tetragonal FePt(L1 0 -FePt) structure Fe-Pt alloy due to its high magnetocrystalline anisotropy (K μ ≈7MJ / m 3 ) and exhibit excellent permanent magnetic properties, combined with its good wear resistance, corrosion resistance and oxidation resistance, it has broad application prospects in the fields of micro-electromechanical, medical and magnetic recording. At present, the disordered face-centered cubic FePt phase (fcc-FePt) is usually obtained by smelting or sputtering first, and then the disordered-ordered phase transition is achieved by high-temperature annealing to obtain the hard magnetic L1 0 - Fe-Pt permanent magnet alloy prepared by the method of FePt phase. But high temperature annealing will lead to L1 0 The grain size of the -FePt phase becomes larg...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/02C21D1/26
Inventor 张伟马殿国李艳辉王英敏
Owner DALIAN UNIV OF TECH
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