Browsing by Author "Wang, Shea Jue"

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Enhanced electromagnetic properties of Fe-Cr-Si alloy powders by sodium silicate treatment
(2015-07-15)
Chen, Shih Fan
;
Chang, Hsuan Yao
;
Wang, Shea Jue
;
Chen, Shih Hsun
;
Chen, Chien Chon
The Fe-Si-Cr alloy powders were successfully modified by using the phosphatizing and sodium silicate coating processes. The optimized surface pre-treatment for Fe-Si-Cr powder was phosphatized in 2 wt.% phosphoric solution and further treated with 4 wt.% sodium silicate solution at 75 degrees C for 30 min. These treatments increased the high-frequency stability for Fe-Si-Cr alloy powders, and the annealed cores further showed the enhanced performance of permeability, impedance, quality factor and anti-corrosion ability. Comparing with the Fe-Si-Al alloy, the Fe-Si-Cr also showed a superior performance in density, moldability and saturated magnetic induction. (C) 2015 Elsevier B.V. All rights reserved.
Influence of annealing treatment on soft magnetic properties of Fe76Si10B10Cr2Y2 amorphous ribbon
(2015-04-05)
Chen, Shih Fan
;
Hung, Chi Yu
;
Wang, Shea Jue
;
Chen, Shih Hsun
;
Chen, Chien Chon
In this study, the influence of annealing treatment on soft magnetic properties of Fe76Si10B10Cr2Y2 amorphous ribbon was investigated. Alloy ribbons were synthesized by the single roller melt-spinning method. The magnetic measurements of the as-cast ribbon were inspected, including M-s, H-c and T-c. The value of Ms was 1.25 T, H-c was 22.84 A/m and T-c was 564.4 K. The soft magnetic properties of the optimum parameter for the annealing temperature and annealing time was at 500 degrees C for 3 min, M-s was 1.37 T and H-c was 1.11 A/m. Therefore, the soft magnetic properties of the Fe76Si10B10Cr2Y2 alloy ribbon was significantly improved through the annealing treatment. (C) 2015 Published by Elsevier B.V.