Coated magnetic alloy material and method for the manufacture thereof

A technology of alloy materials and magnetic alloys, which is applied in the field of material science and material physics, can solve the problems of low corrosion resistance, poor mechanical properties, low ductility and mechanical integration/integration, and achieve the best mechanical properties, Large magneto-caloric effect, the effect of improving the feasibility of the application

Inactive Publication Date: 2011-11-16
INST FUER FESTKOERPER & WERKSTOFFORSCHUNG DRESDEN EV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Known NaZn 13 The main disadvantage of the type magnetic alloy material is the poor mechanical properties of the magnetic alloy material, especially its very low ductility and mechanical integrity / integration, and its very low corrosion resistance
As a result, the use conditions and selection of heat transfer media are greatly limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0040] LaFe is prepared from the elements La, Fe and Si by arc melting 11.6 Si 1.4 alloy. Afterwards, the alloy was rapidly hardened at a copper wheel surface velocity of 30 m / s and subsequently heat treated at 1050 °C for 1 h [A. Yan, K.-H. Müller, O. Gutfleisch, J. Appl. Phys. 97 (2005) 036102]. The resulting material is in the form of ribbons with a thickness of 60 μm and is 90 wt% composed of NaZn 13 type phase and 10% by weight is composed of α-Fe.

[0041] By electroless metallization, a 1 μm thick layer of Ni was applied to the tape over a period of 30 minutes. Electroless metallization consists of configuration (konform) A.Brenner [A.Brenner et al., Res.Natl.Bur.Std.37 (1946) 31; Proc.Am.Electroplaters`Soc., 33 (1946 )23], the solution heated to 80°C was carried out at a pH value of 9.

[0042] Strips coated with Ni showed an increase in elastic strength of at least 25% compared to uncoated strips.

[0043] By virtue of the coating of the strip, the strip is now...

example 2

[0049] The composition LaFe is prepared from the elements La, Fe and Si by means of an arc melting method. 11.6 Si 1.4 alloy. Thereafter, the alloy was rapidly hardened at a copper wheel surface velocity of 30 m / s, and then heat-treated at 1050° C. for 1 hour. The resulting material is in the form of ribbons with a thickness of 60 μm and is 90 wt% composed of NaZn 13 type phase, and 10% by weight is composed of α-Fe.

[0050] At room temperature, a 1 μm thick Co layer was applied over 5 min to the Bring it on. A Pt-sheet was utilized as the counter electrode.

[0051] After coating with Co, the temperature at which the maximum entropy change occurs shifts from 185K to 200K. When the magnetic field changes to 2 Tesla, the maximum entropy change ΔS max =125kJ / m 3 K, the half-value width is 8.3K, and the relative cooling power is 1.2MJ / m 3 . The change in magnetic properties is attributed to the diffusion of Co into La(Fe,Si) 13 phase lattice.

example 3

[0053] A tablet-shaped solid material is prepared from the elements La, Fe, Co and Si by arc melting and subsequent heat treatment at 1050°C for 18 days, the composition of which is LaFe 11.6 co 0.2 Si 1.2 , and measures approximately 5mm in diameter x 2mm in height. The resulting material is 87% by weight NaZn 13 type phase, and 13% by weight is composed of α-Fe. The alloy was hydrogenated at 400° C. in 5 bar of hydrogen. The hydrogen concentration at z=1.6 was determined by means of thermal extraction. This corresponds to LaFe 11.6 co 0.2 Si 1.2 h 1.6 composition.

[0054] Metallization by 30 minutes of electroless plating, a 1 μm thick layer consisting of Ni was applied to LaFe 11.6 co 0.2 Si 1.2 h 1.6 on the alloy. Electroless metallization is composed of configuration A.Brenner [A.Brenner et al., Res.Natl.Bur.Std.37(1946)31; Proc.Am.Electroplaters` Soc., 33(1946)23] The solution heated to 80°C was carried out at a pH value of 9.

[0055] By virtue of the c...

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Abstract

The invention refers to the area of materials science and material physics and relates to a coated magnetic alloy material that can be used, for example, as a magnetic cooling material for cooling purposes. The object of the present invention is to provide a coated magnetic alloy material that exhibits improved mechanical and/or chemical properties. The object is accomplished by a magnetic alloy material having an Na Zn13-type crystalline structure and having a composition according to the formula Ra Fe100-a-x-y-z Tx My Lz, the surface of said alloy material being coated with a material comprising at least one element from the group of Al, Si, C, Sn, Ti, V, Cd, Cr, Mn, W, Co, Ni, Cu, Zn, Pd, Ag, Pt, Au or combinations thereof. The object is further achieved by a method in which the magnetic alloy material is coated by way of fluid phase processes.

Description

technical field [0001] The invention relates to the fields of materials science and materials physics and relates to a coated magnetic alloy material which can be used, for example, as a magnetic cooling material (magnetocaloric material) for cooling purposes or for energy Generation purpose, and the present invention relates to the preparation method of this magnetic alloy material. Background technique [0002] Magnetic cooling by magnetic alloy materials opens an environmentally friendly, energy and cost efficient alternative to conventional gas compression cooling schemes. Magnetic cooling schemes are based on the magnetocaloric effect (MCE = magnetocaloric effect), for which a temperature change occurs due to a change in the magnetization of the material. Materials with very large MCEs are of particular interest for applications. [0003] Here, with NaZn 13 Magnetic materials with a crystal structure of the type exhibit a particularly large MCE, which is determined b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/01
CPCH01F1/015C23C18/32C25D7/001C22C38/02B32B15/015C22C38/10C21D7/00C22C33/04B32B15/013C22C38/005C25D3/562C25D7/00Y10T428/12063Y10T428/12181Y10T428/12438Y10T428/12465Y10T428/31678H01F1/01
Inventor 朱利安·卢比那米凯拉·布施贝克奥利弗·古特弗莱施
Owner INST FUER FESTKOERPER & WERKSTOFFORSCHUNG DRESDEN EV
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