Mo元素对LaFe<sub>11.5</sub>Si<sub>1.5</sub>磁制冷材料耐腐蚀性能及磁性能的影响

doi:10.11868/j.issn.1001-4381.2019.000402

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Abstract

The effect of Mo on phase formation, corrosion resistance and magnetic property of LaFe_11.5Si_1.5 magnetic refrigeration materials were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM), electrochemical workstation and vibrating sample magnetometer (VSM). The results show that the amount of α-Fe phase and La-rich phase increases with the increase of Mo content. Mo is distributed in both NaZn₁₃-type structure phase (1:13 phase for short) and α-Fe phase, but it does not appear in the La-rich phase. The studies on the corrosion resistance show that the corrosion potential increases and corrosion current density decreases with the increase of Mo content from x=0 to x=0.2, which indicate that the thermodynamic stability and corrosion resistance are improved. However, the corrosion resistance decreases while x increases to 0.3. The maximum magnetic entropy changes of LaFe_11.5-xMo_xSi_1.5 under a magnetic field change of 0-3 T are about 18.51 J/(kg·K)(x=0), 16.24 J/(kg·K)(x=0.1) and 5.68 J/(kg·K)(x=0.2), respectively.

Key words： magnetic refrigeration material La(Fe, Si)₁₃ corrosion resistance magnetic property

Received: 27 April 2019 Published: 15 August 2020

ZTFLH:

TG146.4

Corresponding Authors: Jie HU E-mail: hujiecactus@163.com

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	Jie HU
	Zhong-qi DONG
	Ying-ming SHEN
	Yang WANG
	Jun-ya YANG

Cite this article:

Jie HU,Zhong-qi DONG,Ying-ming SHEN, et al. Effect of Mo on corrosion resistance and magnetic property of LaFe_11.5Si_1.5 magnetic refrigeration materials[J]. Journal of Materials Engineering, 2020, 48(8): 119-125.

URL:

http://jme.biam.ac.cn/EN/10.11868/j.issn.1001-4381.2019.000402 OR http://jme.biam.ac.cn/EN/Y2020/V48/I8/119

XRD patterns of LaFe_11.5-xMo_xSi_1.5(x=0, 0.1, 0.2, 0.3)alloys

SEM micrographs of LaFe_11.5-xMo_xSi_1.5 alloys
(a)x=0;(b)x=0.1;(c)x=0.2;(d)x=0.3

Mo content in 1:13 phase and α-Fe phase as function of the Mo concentration

Potentiodynamic polarization curves(a) and corrosion rate(b) of LaFe_11.5-xMo_xSi_1.5(x=0, 0.1, 0.2, 0.3)alloys after immersed in deionized water

Corrosion current density and corrosion potential of LaFe_11.5-xMo_xSi_1.5(x=0, 0.1, 0.2, 0.3) alloys in deionized water

Thermomagnetization curves of LaFe_11.5-xMo_xSi_1.5(x=0, 0.1, 0.2) alloys

Isothermal magnetization curves of LaFe_11.5-xMo_xSi_1.5 alloys
(a)x=0;(b)x=0.1;(c)x=0.2

Temperature dependence of magnetic entropy changes of LaFe_11.5-xMo_xSi_1.5 alloys
(a)x=0;(b)x=0.1;(c)x=0.2

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