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Prospect and status of iron-based rare-earth-free permanent magnetic materials
Li, Da,Li, Yong,Pan, Desheng,Zhang, Zhidong,Choi, Chul-Jin Elsevier 2019 Journal of magnetism and magnetic materials Vol.469 No.-
<P><B>Abstract</B></P> <P>With the advent of high performance permanent magnets based on the rare-earth (RE) elements such as Sm-Co, Nd-Fe-B alloys in 1980s, the application areas have been extended from the electronics to hybrid electric vehicles and wind turbines etc. However, the advantages of these RE based magnets may be overshadowed by the supply constraints, high prices and environmental issues. Much attention has been paid on non-RE element based permanent magnetic materials as next generation of permanent magnetic materials, due to low cost, large coercivity and high Curie temperatures (working temperatures). A variety of methods are available to manufacture RE-free permanent magnetic materials in bulk, nanostructure, nanocomposite and thin films. The proper scale-up methods to produce magnetic nanostructures with high energy efficiency have still been a significant challenge, which are very important to the development of novel RE-free permanent magnetic materials to meet tomorrow’s energy needs. In this review paper, we emphasize to introduce the prospect and status of developments of iron-based RE-free hard-magnetic nanomaterials involving magnetic thin films, nanocomposites and nanostructures.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Several fundamental physics effects of magnetic theory are introduced for high permanent magnetic properties. </LI> <LI> The research progress of Fe-based rare-earth-free hard-magnetic materials is reviewed. </LI> <LI> The magnetic properties and preparation method of Fe-based hard-magnetic nanomaterials are summarized. </LI> </UL> </P>
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Jiapeng Liao,Yousen Hu,Jinggang Li,Desheng Jin,Shuqi Meng,Tianming Ruan,Yisong Hu,Ziyu Zhang 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.3
Corrosion release behavior of Alloy 690 in high-temperature water was investigated under the conditionsof injected Zn concentrations of 0 ppb, 10 ppb and 50 ppb. A protective oxide film composed of Zn(FexCr1-x)2O4 and Cr2O3 was formed with Zn injection, resulting in a better corrosion resistance. In comparisonwith the Zn-free condition, the corrosion release rate under the Zn-injection conditions was smaller. Thecorrosion release inhibiting factors were 1.7 and 1.9 under the conditions of 10 ppb and 50 ppb Zninjectionrespectively. A foreseen application of the corrosion and corrosion release rates has beenproposed and discussed.
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