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Low-temperature sintering hexagonal crystal series soft magnet ferrite

A technology of soft magnetic ferrite and hexagonal ferrite, which is applied in the field of metal materials, can solve the problems of reducing the performance of components and affecting the sintering effect, and achieve the effects of high material performance indicators, wide firing temperature and wide application prospects

Inactive Publication Date: 2008-01-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the mixing of sintering aid and ferrite requires secondary mixing, which will introduce more impurities; it is also difficult to mix the main material and sintering aid very uniformly, which affects the sintering effect; and the sintering aid is enriched at the grain boundary , which may promote the diffusion of Ag along the grain boundary and reduce the performance of the device

Method used

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  • Low-temperature sintering hexagonal crystal series soft magnet ferrite

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Embodiment 1

[0012] Embodiment 1, adopts analytically pure Fe 2 o 3 、BaCO 3 、 Bi 2 o 3 , CuO, Co 3 o 4 , ZnO, MgO, MnO 2 , NiO, TiO 2 As the initial raw material, weigh the raw material according to the composition ratio (weight ratio) shown in Table 1, use absolute ethanol as the medium for ball milling and mixing for 24 hours, dry at 75°C, pass through a 200-mesh sieve, and pre-calcine for 4 hours; the obtained powder is ball milled Sieve, granulate, shape, and sinter at 890°C for 4 hours. Ring samples, outer diameter 20mm, inner diameter 10mm, thickness 2.5mm, molding pressure 7MPa; sheet samples, diameter 10mm, thickness 1mm, molding pressure 2MPa. The upper and lower surfaces of the fired flake samples were coated with silver to measure their dielectric constant and resistivity. The magnetic spectrum of the fired ring sample was measured by HP4291B (1M-1GHz) RF impedance analyzer. The performance parameters of the obtained samples are listed in Table 1.

Embodiment 2

[0013] Embodiment 2, adopt analytically pure Fe 2 o 3 、BaCO 3 、 Bi 2 o 3 , CuO, Co 3 o 4 , ZnO as the initial raw material, by weight ratio Fe 2 o 3 : BaCO 3 : Bi 2 o 3 :CuO:Co 3 o 4 : ZnO=100: 37.7: 4.9: 3.4: 8.5: 6.9 Weigh the raw materials, use absolute ethanol as the medium for ball milling and mixing for 24 hours, dry at 75°C, pass through a 200-mesh sieve, pre-calcine at 900°C, and keep warm for 4 hours to obtain Pure single-phase Y-type hexagonal ferrite powder; ball milling, granulation, molding, sintering at 850°C, 870°C, 890°C, 910°C for 2 hours (denoted as samples 2-1, 2- 2, 2-3 and 2-4). Ring samples, outer diameter 20mm, inner diameter 10mm, thickness 2.5mm, molding pressure 7MPa; sheet samples, diameter 10mm, thickness 1mm, molding pressure 2MPa. The upper and lower surfaces of the fired flake samples were coated with silver to measure their dielectric constant and resistivity. The fired ring sample was measured with HP4291B (1M-1GHz) RF impedance ...

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Abstract

The invention belongs to the metal material field, in particular to a hexagonal soft magnetic ferrite material that can be sintered at a low temperature directly. The invention is characterized in that the invention adopts Bi2O3 as one of the constituent, and replaces Ba2+ with Bi3+, and divalent metal Me2+ with Fe3+ to balance the overall electricity price. The crystal phase of the hexagonal soft magnetic ferrite material is Y-type hexagonal ferrite, and the molecular formula is Ba2-xBixMe2+xFe12-xO22, 0<x<0.5. Me is one or several types of Co, Zn, Cu, Mg, Mn, and Ni. The material has the advantages of low sintering temperature, wide sintering temperature, simple production method, application to industrialized production, stable performance, high reliability, and high indexes of performance. The magnetic conductivity of sintered samples is 2-30, cut-off frequency 500MHz-8GHz, temperature change rate not above 10-6 / DEG C, resistance rate above 108 ohm is multiplied by cm, and dielectric coefficient 10-20, which meet and even exceed requirements on magnetic medium by sensing components such as UHF inductance and piece magnetic bead, and various combined piece components.

Description

Technical field: [0001] The invention belongs to the field of metal materials, in particular to a hexagonal soft magnetic ferrite material which can be directly sintered at low temperature. Background technique: [0002] As one of the three passive chip components, chip inductors are widely used in various electronic devices. In recent years, with the rapid development of electronic products such as mobile communication technology and electronic computers, the application frequency of electronic products has become higher and higher, which has exceeded GHz, which requires the application frequency of various electronic components to increase accordingly. At present, chip inductors use NiZnCu ferrite as the magnetic medium, but NiZnCu ferrite is limited by its cubic crystal structure, and the cut-off frequency is only about 100MHz at most, which cannot be used in even / ultra-high frequency bands. Hexagonal soft magnetic ferrite (Y type, Z type, W type, M type, X type, U type)...

Claims

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Application Information

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IPC IPC(8): H01F1/34C04B35/26C04B35/64
Inventor 白洋乔利杰徐芳
Owner UNIV OF SCI & TECH BEIJING
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