【摘 要】
:
MnZn soft magnetic ferrites have been widely utilized in power electronics,owing to the combined merits of high permeability and low energy loss.However,their d
【机 构】
:
Institute of Advanced Magnetic Materials,College of Materials & Environmental Engineering,Hangzhou D
论文部分内容阅读
MnZn soft magnetic ferrites have been widely utilized in power electronics,owing to the combined merits of high permeability and low energy loss.However,their deployment would result in a drastic increase in power dissipation at >3 MHz,thus limiting the scope extent of miniaturization,together with their efficiency.Here,we report a high-performance MnZn ferrite by doping multiple ions (La,Ti,Si,Ca) at grain boundaries,achieving the most optimized power loss of 267 kW/m3 at 5 MHz (10 m T,100 ℃) and initial permeability of 644,which is much better than the previously reported results and commercial products.Such an improvement is attributed to weakened magnetic exchange coupling at grain-boundary regions,associated with a significant transition from the multi-to mono-domain structures,originating physi-cally from large crystallographic mis-orientations (>25°).The present study bears important significance in understanding the intrinsic correlation between the crystallographic mis-orientation and magnetic domain structure,and provides an alternative way for optimizing high-frequency soft magnetic ferrites.
其他文献
The highly thermal stability precipitates strengthen creep resistance for alloys,which require precipitates to resist coarsen at elevated temperature.In the Mg-
In this study,we successfully prepared a Mg-6Zn-0.2Ca alloy by utilizing sub-rapid solidification(SRS)combined with hard-plate rolling(HPR),whose elongation-to-failure increases from~17%to~23%without sacrificing tensile strength(~290 MPa)compared with its
Combining dissimilar materials in a single component is an effective solution to integrate diverse material properties into a single part.Copper-stainless steel
基于信息技术的发展,高校图书馆服务的创新,本文主要对创客空间进行介绍,阐述高校图书馆构建创客空间的意义,提出相应的创客空间信息服务新模式,期以能够对高校图书馆创客空间信息服务模式的构建及优化提供帮助。
The alloying effects of Ni,W and Cr on the microstructural stability of CoNi-base alloys were investigated using a multicomponent diffusion multiple after being
本文主要对10kV配电变压器不同理论模型中的电磁暂态耦合机理及谐波振荡特性进行了理论分析,并通过现场试验及软件仿真的方式,提出了兼顾高低频段电磁耦合特性的配电变压器宽频等效模型,并通过现场试验及软件仿真方式验证了该模型的正确性,为10 kV配变过电压研究提供了理论参考。
This study reports on the effect of the addition of Glycine to Hank's solution on the in-vitro corrosion behavior of AZ31 magnesium (Mg) alloy at 37 ℃ and a p
本文以“互联网+教育”为背景,融合混合式教学,以高职高专经济管理类专业学生人才培养方案为依据,以“市场调查与预测”课程为主体,构建“多角度分析、多形式施教、分层次评价、全方位发展”的四位一体差异化教学模式。通过实践验证了该模式能有效调动学生的学习兴趣,提升教学效果,培养学生的综合能力,可为高职高专院校其他课程建设提供借鉴。
The addition of a small amount of oxygen improves the mechanical properties,especially plasticity,of Ti45.7Zr33Ni3Cu5.8Be12.5 amorphous alloy composites (AACs)
本文分析归纳出高职院校心理健康教育主要存在服务管理体系不健全、课程教育体系不完善、实践教育体系不深入、育人质量监控体系不科学、心理危机干预体系不协同、队伍不成熟等问题,提出通过构建“四维、三级”育人体系、完善课程思政体系、丰富实践教育体系等方法来逐步完善。