圧粉磁心の静的破壊挙動と強度ばらつきについて
スポンサーリンク
概要
- 論文の詳細を見る
Powder magnetic core is a densely-packed material produced by compacting soft magnetic metal powders coated with an insulating surface layer tens of nanometers thick. This material exhibits low eddy current loss due to its high electrical resistivity, and can provide opportunities for new three-dimensional designs of electrical machines because of the magnetically isotropic characteristics and complex shape forming capabilities. However, the mechanical strengths of the magnetic powder cores are usually lower by a factor of one-third or one-tenth than those of the typical Fe-Cu-C sintered materials. In this study, the mechanical strengths of three typical powder magnetic cores were examined by three-point bending test, by tensile test and by fatigue test to discuss the basic mechanical strength characteristics of the magnetic powder cores. The fractured surfaces of the specimens were observed with an optical microscope and scanning electron microscope, and the mechanical strength fluctuation was discussed by Weibull analysis. As a result, the fracture of powder magnetic cores was generated in the insulating layer on the metal powder boundary and/or at the boundary of insulating layer and the metal powder. The Weibull moduli were approximately in 30 to 45 range, which is higher than that of the conventional ceramic materials. The relationship between static strength and fatigue strength of the powder magnetic cores was similar to that of a low-density sintered metal.
著者
関連論文
- 金属平形ガスケットの密封特性 : ポリカーボネイト薄膜を用いた接触状態の観察
- 接触圧力解析によるサーマルヘッドの設計
- 摩擦・摩耗 接触と摩擦の理論
- インサートリングを用いたセラミックスと金属の締りばめの高温結合強度に関する研究 : 第1報, インサートリングを用いた締りばめ法の提案と実験結果
- 「トライボロジストはいかに育成されるか」特集号発刊によせて
- PET薄膜を用いた真実接触面積の分布の測定
- 音響を利用した中空光ファイバにおける漏洩検出（実験および理論解析）
- 新潟大学 トライボロジー研究室
- 真実接触面積の可視化技術
- 接触問題の基礎と最近わかってきたこと
- シュリンクフィッタ
- 理事の仕事
- 圧粉磁心の静的破壊挙動と強度ばらつきについて