Impact of Nitriding on Microstructure and Wave-absorbing Properties of SmFeN Alloy Powders

doi:10.11901/1005.3093.2023.560

Chinese Journal of Materials Research

2024, Vol. 38

Issue (10): 751-758 DOI: 10.11901/1005.3093.2023.560

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Impact of Nitriding on Microstructure and Wave-absorbing Properties of SmFeN Alloy Powders

DONG Yuhang, LIU Chunzhong(

), ZHANG Hongning, LU Tianni, LI Na, HUANG Zhenwei, MA Chiye

Materials Science and Engineering, Shenyang Aerospace University, Shenyang 110136, China

Cite this article:

DONG Yuhang, LIU Chunzhong, ZHANG Hongning, LU Tianni, LI Na, HUANG Zhenwei, MA Chiye. Impact of Nitriding on Microstructure and Wave-absorbing Properties of SmFeN Alloy Powders. Chinese Journal of Materials Research, 2024, 38(10): 751-758.

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Abstract

SmFeN has received a lot of attention in recent years because of its exceptional wave-absorbing characteristics. Herein, nitro-SmFeN alloy powders were prepared by gas nitriding at 550^oC for 2 h and 3 h. Then the effect of nitriding treatment on their microstructure and electromagnetic parameters (including the dielectric real part ε′, the dielectric imaginary part ε″, the permeability real part μ′ and the permeability imaginary part μ″), attenuation constants, and impedance matching, as well as the influence on wave-absorbing properties were studied in detail. The findings indicate that the N content of SmFeN alloy powders can be increased due to the nitriding treatment, as a subsequence the the nitride structure of SmFeN is changed to Fe₃N and Fe₂N, therewith its wave absorbing performance is enhanced. Following nitriding, SmFeN's reflectivity value is significantly increased (with a minimum reflection loss value of -52.49 dB). Additionally, the effective absorption bandwidth is widened and moved to a lower frequency, with a maximum value of 4.3 GHz in the 10.4~14.7 GHz frequency range. The study's findings offer a useful concept for the ensuing relevant applications.

Key words: metallic materials SmFeN nitriding wave-absorbing properties dielectric loss impedance matching

Received: 22 November 2023

ZTFLH:

TB34

Fund: Open Funds of the State Key Laboratory of Rare Earth Resource Utilization(RERU2022-019);Applied Basic Research Program of Liaoning Province(2023JH2/101300235)

Corresponding Authors: LIU Chunzhong, Tel: 18040038858, E-mail: czliu@sau.edu.cn

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	DONG Yuhang
	LIU Chunzhong
	ZHANG Hongning
	LU Tianni
	LI Na
	HUANG Zhenwei
	MA Chiye

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https://www.cjmr.org/EN/10.11901/1005.3093.2023.560 OR https://www.cjmr.org/EN/Y2024/V38/I10/751

Table 1 Chemical composition of SmFeN alloys

Table 2 Description of sample number

Fig.1 XRD patterns of SmFeN powders with different nitriding time

Table 3 Phase content of SmFeN with different nitriding durations (%, volume fraction)

Fig.2 SEM images of SmFeN with different nitriding durations (a) S0 sample scan, (b) S2 sample scan, (c) S3 sample scan

Fig.3 EDS spectra of SmFeN with different nitriding time (a) S0 sample scan, (b) S2 sample scan, (c) S3 sample scan

Fig.4 Electromagnetic parameter curves of SmFeN with different nitriding time (a) the frequency-dependent curve of the solid part of the dielectric, (b) the frequency-dependent curve of the imaginary part of the dielectric, (c) the frequency-dependent curve of the real part of the permeability, (d) the frequency-dependent curve of the imaginary part of the permeability

Fig.5 Dielectric and magnetic losses of SmFeN with different nitriding durations (a) curve of dielectric loss versus frequ-ency, (b) curve of magnetic loss versus frequency

Fig.6 Cole-Cole circles of SmFeN powders with different nitriding durations (a) S0 sample Cole-Cole circle, (b) S2 sample Cole-Cole circle, (c) S3 sample Cole-Cole circle

Table 5 Static dielectric coefficients and optical frequency dielectric coefficients of SmFeN powders with different nitriding durations calculated without Cole-Cole semicircle

Fig.7 C₀ value curves of SmFeN powders with different nitriding durations

Fig.8 Decay constant a-value curves of SmFeN powders with different nitriding durations

Fig.9 Impedance matching plots of SmFeN powders with different nitriding durations (a) S0 sample impedance matching, (b) S2 sample impedance matching, (c) S3 sample impedance matching

Fig.10 3DRL plots for different nitriding durations (a) 3D plot of reflectance values of S0 sample, (b) 3D plot of reflectance values of S2 sample, (c) 3D plot of reflectance values of S3 sample

Table 6 Minimum reflectance and effective bandwidth range for different nitriding durations of pristine SmFeN

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