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Abstract
Diffusion process by Nd-Al and Pr-Al alloys was compared and investigated in Nd-Fe-B thin films. Enhanced coercivity 2.06T and good squareness was obtained by using Pr85Al15 and Nd85Al15 alloys as diffusion sources. But the coercivity of diffusion-processed thin films by Pr70Al30 and Pr55Al45 alloys decreased to 2.04T and 1.82T. High ambient coercivity of 2.26T was achieved in diffusion-processed thin film by Nd70Al30 leading to an improved coercivity thermal stability because Nd2Fe14B grains were enveloped by Nd-rich phase as seen by transmission electron microscopy Nd-loss image. Meanwhile, microstructure-dependent parameters α and Neff were improved. However, high content of Al in diffusion-processed thin film by Nd55Al45 lead to degraded texture and coercivity.
Highlights
IntroductionNd-Fe-B permanent magnets has been applied in wind power generators and hybrid electrical vehicles (HEV) motors, due to the high maximum energy product.[1] Usually, the working temperature of permanent magnetic motors is above 150◦C, at which the coercivity of commercial sintered magnets is too low to be used
In recent years, Nd-Fe-B permanent magnets has been applied in wind power generators and hybrid electrical vehicles (HEV) motors, due to the high maximum energy product.[1]
The hysteresis loops parallel to the c-axis and perpendicular to the c-axis directions were measured by the superconducting quantum interference devices (SQUID) with temperature up to 400 K
Summary
Nd-Fe-B permanent magnets has been applied in wind power generators and hybrid electrical vehicles (HEV) motors, due to the high maximum energy product.[1] Usually, the working temperature of permanent magnetic motors is above 150◦C, at which the coercivity of commercial sintered magnets is too low to be used. The application of commercial Nd-Fe-B magnets is still limited by the low coercivity and its poor thermal stability.[2] In order to meet the application requirements at high temperature, the ambient coercivity of 3 T is required.[3] Usually, the ambient coercivity of ∼ 3 T can be obtained by doping heavy rare-earth elements Dy and Tb to partially replace Nd in Nd2Fe14B phase. The heavy rare-earth elements Dy and Tb are costly. Their moments are antiferromagnetically aligned with Fe and Nd, leading to the decreased magnetization. It is necessary to develop high coercivity in Dy-free Nd-Fe-B permanent magnets
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