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Strong-permanent-magnetic nano-porous Fe-Pt alloy and preparation method thereof

A magnetic nano and nanoporous technology, applied in the direction of magnetic objects, magnetic materials, magnetic films, etc., to achieve the effect of improving the ability of amorphous formation, uniform pore size and complete structure

Active Publication Date: 2015-09-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the permanent magnetic Fe-Pt alloys prepared at home and abroad are mostly bulk materials [Xiao et al, J Alloy Compd, 364(2004): 315; Gopalan et al, J Magn Magn Mater, 322(2010): 3423], thin film Materials [Chen et al, J Magn Magn Mater,239(2002:471; Li et al,J Magn Magn Mater,205(1999):1] or nanoparticles [Takahashi et al,J Appl Phys,95(2004): 2690; Sun et al, IEEE T Magn,37(2001):1239], the preparation of permanent magnetic nanoporous Fe-Pt alloy is still blank

Method used

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  • Strong-permanent-magnetic nano-porous Fe-Pt alloy and preparation method thereof
  • Strong-permanent-magnetic nano-porous Fe-Pt alloy and preparation method thereof
  • Strong-permanent-magnetic nano-porous Fe-Pt alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: Precursor alloy composition Fe 60 Pt 10 B 30

[0033] Step 1. Ingredients

[0034] Fe, Pt and B raw materials with purity greater than 99wt% are used according to Fe 60 Pt 10 B 30 Nominal ingredients are weighed for batching.

[0035] Step 2: Master alloy ingot melting and quench strip sample preparation

[0036] The weighed metal raw materials were mixed into a water-cooled copper crucible in a non-consumable arc melting furnace, and smelted repeatedly in an Ar gas atmosphere for 4 times to obtain an alloy ingot with uniform composition. The master alloy ingot is crushed and put into a quartz tube with a nozzle diameter of about 0.5mm. The master alloy is heated to a molten state by induction melting in an Ar atmosphere, and then the alloy liquid is sprayed onto the high-speed rotating copper roller by using the pressure difference. , and throw the strip at a speed of about 25-50m / s to obtain a continuous alloy strip with a width of about 2mm and ...

Embodiment 2

[0045] Example 2: Precursor alloy composition Fe 52 Pt 29 B 19

[0046] The steps of batching, master alloy ingot smelting, quenching strip sample preparation and sample structure detection are the same as Steps 1-3 in Example 1. The results of XRD and HRTEM show that the alloy strips prepared at the speed of 20-37m / s have L1 0 -FePt and Fe 2 The B nanocomposite structure can be dealloyed as a precursor alloy without heat treatment. The steps of electrochemical performance test, dealloying and nanoporous alloy structure, morphology characterization and magnetic property test are the same as Steps 5 and 6 in Example 1. The chemical composition of the finally obtained nanoporous FePt alloy is Fe 50.1 Pt 49.9 , i h c , M 50 and M r They are: 16.2kOe, 51.9emu / g and 36.2emu / g.

[0047] The advantage of this embodiment is that the heat treatment process of the alloy strip can be optionally omitted, the alloy strip can be directly dealloyed, and the process for preparing ...

Embodiment 3

[0048] Embodiment 3: Precursor alloy composition Fe 50 Pt 20 B 30

[0049] The implementation steps are the same as in Example 2, and the alloy strip prepared under the strip speed of 25~35m / s has L1 0 -FePt, Fe 2 B and FeB nanocomposite structure without annealing process. The chemical composition of the finally obtained nanoporous FePt alloy is Fe 47.7 Pt 52.3 , i h c , M 50 and M r They are: 16.6kOe, 47.8emu / g and 32.8emu / g.

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Abstract

The invention discloses a strong-permanent-magnetic nano-porous Fe-Pt alloy and a preparation method thereof. The strong-permanent-magnetic nano-porous Fe-Pt alloy has the composition of FewCoxPtyPdz, is composed of an L10-FePt ordered hard magnetic phase, and has a complete doubly-connected nano-porous structure, a pore diameter of 10-50nm and a ligament thickness of 20-80nm; the coercivity, the magnetization intensity and the residual magnetism of the alloy under a 50kOe external magnetic field are 13.4-18.5kOe, 40.4-56.3 and 28.3-37.4emu / g respectively. A master alloy ingot is prepared by electric arc melting or induction melting during preparation; an alloy strip is prepared by single-roll spinning; a nano-complex-phase precursor containing hard-magnetic L10-FePt and soft-magnetic Fe2B is obtained directly or through an annealing treatment; the nano-porous Fe-Pt alloy with a single L10-FePt phase structure is obtained through an electrochemical dealloying process, thus filling up the technical gaps of a permanent-magnetic metal nano-porous material.

Description

technical field [0001] The invention relates to a nanoporous Fe-Pt alloy with strong permanent magnetism and a preparation method thereof, belonging to the technical field of new materials. Background technique [0002] Nanoporous metals refer to metal materials with a porous structure composed of nanoscale pores and adjacent metal ligaments. Nanoporous metal materials have the characteristics of nanomaterials, porous materials and metal materials, and have excellent physical, chemical and mechanical properties such as nanometer surface effect, high specific surface area, good electrical conductivity and thermal conductivity, etc., and are used in catalysis, separation, electronics, optics and Biomedical and other fields have broad application prospects. [0003] In recent years, the dealloying method has become the preferred method for preparing nanoporous metals because of its simple process and high preparation efficiency. This method is a selective corrosion technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08C22C1/03C22C11/00C22F1/16H01F1/047
CPCC22C1/08C22C5/04H01F10/123B22F2999/00C22C2202/02B82Y30/00B82Y40/00C22C38/002C22C38/10C22C1/05H01F1/047H01F41/0253
Inventor 张伟王英敏李艳辉马殿国
Owner DALIAN UNIV OF TECH
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