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A kind of nickel-zinc soft magnetic ferrite and preparation method thereof

A soft ferrite, nickel-zinc technology, applied in the field of soft magnetic materials, can solve the problems of low magnetic loss, high magnetic permeability of ferrite magnetic sheets, etc.

Active Publication Date: 2016-08-17
BYD CO LTD
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  • Description
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Problems solved by technology

[0005] In order to solve the problem that the ferrite magnetic sheet in the prior art cannot achieve high magnetic permeability and low magnetic loss at the frequency of 13.56MHz, the present invention provides a nickel-zinc soft magnetic ferrite

Method used

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Embodiment Construction

[0009] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0010] The invention provides a nickel-zinc ferrite used for near-field communication antennas, which specifically includes a main component and an auxiliary component, and the main component includes Fe 2 o 3 , NiO, ZnO and CuO, auxiliary components include Cr 2 o 3 and La 2 o 3 ; Fe in the main component 2 o 3 The content of NiO is 50-55mol%, the content of NiO is 18-22mol%, the content of ZnO is 20-24mol%, the content of CuO is 3-8mol%; the auxiliary components are based on the weight percentage of the main components, Cr 2 o 3 The content of La is 0.1~1wt%, La 2 o 3 The content of 0...

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Abstract

The invention provides nickel-zinc soft-magnetic ferrite and a preparation method thereof. The nickel-zinc soft-magnetic ferrite comprises a principal component and an auxiliary component. The principal component comprises 50 to 55mol% of Fe2O3, 18 to 22mol% of NiO, 20 to 24mol% of ZnO and 3 to 8mol% of CuO; the auxiliary component comprises Cr2O3 and La2O3, wherein the content of Cr2O3 is 0.1 to 1wt% of the weight of the principle component, and the content of La2O3 is 0.1 to 1wt% of the weight of the principle component. The content of the principle component is optimized, and Cr2O3 and La2O3 are added as the auxiliary component, so that obtained nickel-zinc soft-magnetic ferrite possess relatively high complex permeability and relatively low magnetic loss under an operating frequency of 13.56MHz.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic materials, and in particular relates to a nickel-zinc soft magnetic ferrite. Background technique [0002] NFC (Near Field Communication, Near Field Communication) antenna modules are widely used in portable information terminals such as mobile phones. The internal space of the mobile phone is small, and the metal components are installed in a small shell with high density. Since the NFC antenna works at a high frequency of 13.56MHz, the metal The component will produce eddy current effect, which will greatly reduce the communication distance of the NFC antenna, or even fail to respond. In order to increase the communication distance of the antenna module, it is necessary to add a shield between the NFC antenna and the metal component. According to the principle of the magnetic circuit, the metal component is shielded by a magnetic material with high magnetic permeability, so as to achieve t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01F1/34C04B35/26
Inventor 刘梦辉向其军
Owner BYD CO LTD
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