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

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

CN105296895BActive Publication Date: 2017-11-07DALIAN UNIV OF TECH
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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

Patent Timeline
07 Nov 2017
Publication
CN105296895B
IPC
C22C45/02; C21D1/26
Inventors
张伟; 马殿国