Insulation film, powder for magnetic core and powder magnetic core and processes for producing the same
AssigneesKabushiki Kaisha Toyota Chuo Kenkyusho, Toyota Jidosha Kabushiki Kaisha, Finesinter Co., Ltd.
InventorsShin Tajima, Takeshi Hattori, Mikio Kondoh, Kiyoshi Higashiyama, Hidefumi Kishimoto, Masaki Sugiyama, Tadayoshi Kikko
Life of this patent
Estimating the term…
Abstract
An insulation film whose requisite constituent elements are first elements and a second element. The first elements include B, P, O and Fe. The second element can generate cations whose hexa-coordinated ion radius, defined by Shannon, R. D., is 0.073 nm or more, and which are bivalent or more. Since the second element having a large ion radius is incorporated into network formers made from the first elements, it is possible to improve the heat resistance of the insulation film.
Claims28
An insulation film comprising:
- a first element comprising boron (B), phosphorous (P), oxygen (O) and iron (Fe);
- and
- a second element being capable of generating cations whose hexa-coordinated ion radius is 0.073 nm or more, and which are bivalent or more.
A powder for a magnetic core, comprising:
- a magnetic powder;
- and
- an insulation film covering a surface of the magnetic powder, wherein a first element comprising B, P, O and Fe, and a second element capable of generating cations whose hexa-coordinated ion radius is 0.073 nm or more, and which are bivalent or more, are requisite constituent elements.
A powder magnetic core, formed by pressuring a magnetic core powder whose surface is covered with an insulation film, wherein a first element comprising B, P, O and Fe, and a second element capable of generating cations whose hexa-coordinated ion radius is 0.073 nm or more, and which are bivalent or more, are requisite constituent elements.
Dependencies are inferred from the claim text.