Multilayer coil part

A technology of stacking coils and components, applied in transformer/inductor components, electrical components, transformer/inductor coils/windings/connections, etc., can solve problems such as inductance reduction and inability to obtain DC superposition characteristics
CN103597558AActive Publication Date: 2014-02-19MURATA MFG CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
MURATA MFG CO LTD
Publication Date
2014-02-19

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Abstract

This multilayer coil part has a magnetic body section (2) that is made of an Ni-Zn system ferrite material and a Cu-based coil conductor (3) that has been wound into a coil shape. The coil conductor (3) is buried inside the magnetic body section (2) to form a part element body (1). The part element body (1) is divided into a first region (6) that is located close to the coil conductor (3) and a second region (7) that comprises the region other than the first region (6). The grain size ratio (D1 / D2) between the average crystal grain size (D1) of the magnetic body section (2) in the first region (6) and the average crystal grain size (D2) of the magnetic body section (2) in the second region (7) is equal to or lower than 0.85. The molar quantity of CuO content in the ferrite material is set to 6 mol% or less, and the ferrite material is baked in a reductive atmosphere with the oxygen partial pressure being equal to or lower than the Cu-Cu2O equilibrium oxygen partial pressure. Thus, a multilayer coil part that exhibits not only little fluctuation of inductance and excellent thermal shock resistance when subjected to a thermal shock or an external stress but also excellent direct-current superposition characteristics can be obtained without requiring any complicated step.
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Description

technical field

[0001] The present invention relates to a laminated coil component, and more specifically, to a laminated coil component such as a laminated inductor having a magnet portion made of a ferrite material and a coil conductor mainly composed of Cu. Background technique

[0002] Conventionally, laminated coil components using ferrite magnets such as Ni—Zn having a spinel crystal structure have been widely used, and development of ferrite materials has also been actively carried out.

[0003] Such a laminated coil component has a structure in which a conductor part wound in a coil shape is embedded in a magnet part, and usually the conductor part and the magnet part are formed by simultaneous firing.

[0004] However, in the above-mentioned laminated coil component, the linear expansion coefficient is different between the magnet portion made of ferrite material and the conductor portion mainly composed of conductive material. Stress deformation occurs inside duri...

Claims

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