Effects of Y2O3 Content on Properties of Fe-Y2O3 Nanocomposite Powders Synthesized by a Combustion-Based Route
Received date: 2022-03-11
Revised date: 2022-07-02
Online published: 2022-07-25
Supported by
Natural Science Foundation of Beijing(2224104);Guangdong Basic and Applied Basic Research Foundation(2021A1515110202)
Iron-based metal/ceramic nanocomposite materials have attracted increasing attention owing to their outstanding mechanical, electrical, and magnetic properties with potential applications in many industrial fields. However, several technical routes, such as mechanical alloying, sol-gel, and electrodeposition, have limitations, including lengthy synthesis processes, complex experimental equipment, and expensive raw materials. In view of the urgent demand for high-quality iron-based metal/ceramic magnetic nanocomposites, Fe-Y2O3 nanocomposite powders with different Y2O3 contents (mass fraction) have been prepared using a combustion-based route. The effects of the Y2O3 content on the microstructure, grain size, and magnetic and sintering properties of the nanocomposite powders were examined. The Fe-Y2O3 nanocomposite powders exhibited a connected network structure composed of nanoparticles regardless of the Y2O3 content, but the grain size decreased gradually with increasing Y2O3 content. The magnetic performance test showed that the iron nanopowder without Y2O3 had a saturation magnetic induction and coercivity (Hc) of 1.97 T and 6.4 kA/m, respectively. The saturation magnetic induction of the Fe-Y2O3 nanocomposite powders decreased gradually with increasing Y2O3 content, whereas the Hc increased. The saturation magnetic induction and Hc of the Fe-Y2O3 nanocomposite were 1.45 T and 58.9 kA/m, respectively, at a Y2O3 content of 2%. The as-synthesized Fe-Y2O3 nanocomposite powders were densified by pressureless sintering. When the Y2O3 content was low, the nanocomposites could reach a higher relative density at a lower sintering temperature of 700oC. In contrast, densification was difficult to achieve when the Y2O3 content was increased to 1% or 2% even at a high sintering temperature of 1300oC.
ZHANG Deyin , HAO Xu , JIA Baorui , WU Haoyang , QIN Mingli , QU Xuanhui . Effects of Y2O3 Content on Properties of Fe-Y2O3 Nanocomposite Powders Synthesized by a Combustion-Based Route[J]. Acta Metall Sin, 2023 , 59(6) : 757 -766 . DOI: 10.11900/0412.1961.2022.00109
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