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A kind of iron-poor soft ferrite, electromagnetic wave absorbing material and preparation method thereof

A soft ferrite and absorbing material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as pushing up material manufacturing costs

Active Publication Date: 2022-07-19
苏州天源磁业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

NiZn ferrite material contains expensive Ni element, which pushes up the manufacturing cost of the material

Method used

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  • A kind of iron-poor soft ferrite, electromagnetic wave absorbing material and preparation method thereof

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preparation example Construction

[0015] The electromagnetic wave absorbing material of the present invention is composed of the above-mentioned iron-poor soft ferrite. The electromagnetic wave absorbing material can be in the form of a conventional sheet or the like, and its thickness can be selected according to actual needs, such as ≤10mm, and further can be selected as ≤6.5mm. The preparation method of the above electromagnetic wave absorbing material comprises the following steps: (a) weighing the main component and the auxiliary component in proportion, and pre-sintering them at 850-950 ° C after mixing to obtain a pre-sintered material; The pre-sintered material is sanded and dried, and a binder is added for granulation, molding, and sintering to obtain a sintered body; (c) the sintered body can be heat-sintered at 1250-1350° C. In step (b), the binder is polyvinyl alcohol, and the addition amount thereof is 1 wt % of the pre-sintered material. In step (b), the pre-sintering temperature is 900°C and th...

Embodiment 1-11、 comparative example 1-3

[0018] Embodiments 1-11 and Comparative Examples 1-3 respectively provide an electromagnetic wave absorbing material, and the specific preparation steps are as follows:

[0019] (a) Preparation of Fe as the main component 2 O 3 , MnO and ZnO, prepare TiO as a secondary component 2 , SnO 2 , Na 2 O (as Na 2 CO 3 form) and Ta 2 O 5 ; Weigh the main component and the auxiliary components according to Table 1 and carry out wet mixing in a sand mill for 0.5 hours, after drying, pre-sintering at 900 ° C in air for 2 hours to obtain pre-sintered material;

[0020] (b) The pre-sintered material was sanded in a sand mill for 2 hours, and after drying (100 wt % relative to the dried pre-sintered material), 1.0 wt % of polyvinyl alcohol (commercially available) was added as a binder for fabrication. Granulation, molding, and sintering to finally obtain an annular sintered body with an outer diameter of 7.0 mm, an inner diameter of 3.0 mm and a height of 10.0 mm;

[0021] (c) The...

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Abstract

The invention relates to an iron-poor soft ferrite, an electromagnetic wave absorbing material and a preparation method thereof. The main component is composed of a main component and an auxiliary component, and the main component includes 46.0-49.9 mol% Fe in mol percentage. 2 O 3 , 21.0~26.0mol% of ZnO and the balance of MnO; based on the mass sum of the main components, the auxiliary components contain at least 500~2500ppm of TiO 2 or 1000‑5000ppm SnO 2 . By using the main components and sub-components of specific components for compounding, the reflection loss of the electromagnetic wave absorbing material made of it can be above 20dB at both 30MHz and 500MHz frequencies.

Description

technical field [0001] The invention belongs to the field of magnetic materials, and relates to a soft ferrite, in particular to an iron-poor soft ferrite, an electromagnetic wave absorbing material and a preparation method thereof. Background technique [0002] With the continuous development of electronic information technologies such as 5G communication, there is an increasing demand for absorbing materials that can absorb electromagnetic waves. The absorption performance of electromagnetic wave absorbing materials can be evaluated by the reflection loss (Ref(dB)) calculated by the following formula: [0003] (1); [0004] (2); [0005] In the above formula is the wavelength (=c / f), and the complex permeability is , the complex dielectric constant is - , d is the thickness of the absorbing magnetic sheet. Generally speaking, absorbing materials with reflection loss greater than 20dB and above in a given frequency band have excellent absorbing performance; t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/38C04B35/622C09K3/00
CPCC04B35/2608C04B35/2658C04B35/622C09K3/00C04B2235/3284C04B2235/3262C04B2235/3232C04B2235/3293C04B2235/3201C04B2235/3251
Inventor 颜冲张建明王育伟
Owner 苏州天源磁业股份有限公司