Influences of machining and acid etching on magnetic properties of soft magnetic composites

Article type: Research Article

Authors: Higashigawa, Yuto^a | Takahashi, Yasuhito^a; | Fujiwara, Koji^a | Aoyama, Masahiro^b | Akaki, Ryosuke^c

Affiliations: [a] Department of Electrical Engineering, Doshisha University, Kyoto, Japan | [b] Department of Electrical and Electronic Engineering, Shizuoka University, Shizuoka, Japan | [c] Suzuki Motor Corporation, Shizuoka, Japan

Correspondence: [*] Corresponding author: Yasuhito Takahashi, Doshisha University, Kyoto, Japan. E-mail: ytakahashi@mail.doshisha.ac.jp

Abstract: Soft magnetic composites (SMCs) are magnetic materials obtained by compression molding of iron powders with an insulating coating and are suitable for a core of a motor having a complicated structure. It is known that its magnetic property is deteriorated by machining process due to the short circuit of the insulated layer on the material surface. In general, the acid etching treatment is performed to improve the degradation of the magnetic properties. In this paper, first the resistivity of the ring specimen of the SMC applying the acid etching treatment for a different immersion time is measured. Next, the magnetic properties of the specimen are measured, and the effect of the machining process and the acid etching treatment on the magnetic and electric properties of the SMC is investigated.

Keywords: Soft magnetic composite, acid etching, magnetic properties

DOI: 10.3233/JAE-191283

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 61, no. S1, pp. S123-S129, 2019