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Loss-Separation Study on Silica-insulated Gas-atomized Fe-Si-Al Soft Magnetic Composites
T. T. Xu,B. W. Zhang,Z. Shi,W. W. Guan,K. Wan,X. Y. Shi,W. Liu,H. L. Su,Z. Q. Zou,Y. W. Du 한국자기학회 2020 Journal of Magnetics Vol.25 No.2
Fe-Si-Al soft magnetic composites were composed of gas-atomized Fe-9.6wt.%Si-5.4wt.%Al alloy powders insulated with silica nanoparticles. The influence of silica insulation content on the core’s magnetic properties was studied. It was found that increasing the silica mass ratio deteriorated the effective permeability and core loss in the frequency range of 40-120 kHz, while improved the quality factor at 100 kHz and DC-bias performance. The effective demagnetizing field reflected by density and the core’s volume resistivity may cause the variations of these magnetic parameters. Loss separation fitting was performed using the Bertotti formula, indicating that silica insulation increased the hysteresis loss and reduced the eddy-current loss. The hysteresis loss took over at the frequency lower than 120 kHz in this work. With increasing the frequency, the eddy-current loss grew more quickly than the hysteresis loss. Therefore, different methods should be adopted to reduce the core loss according to the core’s application frequency.
A NOVEL TECHNIQUE OF N2O-TREATMENT ON NH3-NITRIDED OXIDE FOR FABRICATING GATE OXIDE IN NMOSFET`S
Xu,ZEng,Lai,P. T.,Ng,W. T. 대한전자공학회 1995 ICVC : International Conference on VLSI and CAD Vol.4 No.1
a new technique of N₂O treatment on NH₃-nitrided oxide is used to prepare thin gate oxide. Experiments on MOS capacitors and nMOSFET's shows that N₂O treatment is superior to conventional reoxidation step in suppressing electron trapping and interface trap creation under high-field stress.
Numerical analysis of hydroformability of three-layered tube
H. B. Xu,S. Y. Kim,S. W. Han,Y. G. Nam,Y. H. Moon 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
Hydroforming is a specialized type of die forming that uses a high pressure hydraulic liquid to pressure working material into a die. The hydroforming process has the merits of weight reduction, lower tooling cost, fewer secondary operations, improved structural strength and stiffness, etc. The main objective of this study is to establish the basic understanding of the hydroformability of a three-layered tube. The three-layered tube was numerically hydroformed in a die and the hydroformability of the tubes was investigated by checking the bulging height and thickness after hydroformed. The simulation tool Dynaform 5.5 and LS-Dyna were used as the preprocessor to simulate the whole process.