| Title |
A Study on the Soft Magnetic Properties and Compaction Density of Fe-based Nanocrystalline Powder Cores Mixed with Permalloy Powders |
| Authors |
신정훈(Jeong Hoon Shin); 정영목(Young Mok Jeong); 손근용(Keun Yong Sohn); 박원욱(Won-wook Park) |
| DOI |
https://doi.org/10.3365/KJMM.2017.55.9.645 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
nanocrystalline; powder core; compaction density; permalloy; soft magnetic properties |
| Abstract |
Abstract: In this paper, the soft magnetic properties and compaction density of Fe-Si-B-Nb-Cu nanocrystalline powder cores, mixed with two kinds of permalloy powders (Ni70Fe30 or Ni50Fe50), have been closely studied. Permalloy powders having an average diameter of 4 μm were added in the range of 5 to 15 wt%, and the powder composite was mixed with 1~2 wt% of water glass diluted with DI water. The powder cores were compacted in toroidal form at a pressure of about 35 tons, and then heat treated at 510 ~ 570 ℃ for 1 h. The magnetic properties of the soft magnetic composites (SMCs) were measured with a B-H analyzer and the microstructure was observed with FE-SEM. As a result, it was determined that the compaction density of the powder core increased with the increasing content of the mixed permalloy powder, which distinctly improved the composite`s magnetic properties, including initial permeability and core loss.(Received December 30, 2016; Accepted May 12, 2017) |