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A kind of low dielectric microwave ferroelectric ceramic and its preparation method

A ferroelectric ceramic and microwave technology, applied in the field of microwave dielectric ceramics, achieves the effects of small dielectric constant, low microwave dielectric loss, and increased reliability

Active Publication Date: 2018-02-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the above defects or improvement needs of the prior art, the present invention provides a low dielectric microwave ferroelectric ceramic and its preparation method, the purpose of which is to solve the problem that the existing low dielectric microwave dielectric ceramics mainly rely on the addition of Ti-based materials to regulate their τ f question of value

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  • A kind of low dielectric microwave ferroelectric ceramic and its preparation method
  • A kind of low dielectric microwave ferroelectric ceramic and its preparation method
  • A kind of low dielectric microwave ferroelectric ceramic and its preparation method

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preparation example Construction

[0035] The preparation method of the above-mentioned low dielectric microwave ferroelectric ceramics comprises the following steps:

[0036] (1) BaO, ZnO and SiO 2 After mixing, carry out wet ball milling treatment, and pre-calcine at 1100°C after drying to obtain xBaO-yZnO-zSiO 2 Matrix ceramic powder;

[0037] (2) the above xBaO-yZnO-zSiO 2 The base ceramic powder is subjected to wet ball milling treatment, after being dried, polyvinyl alcohol (PVA) is added to granulate, and after being pressed into tablets, it is sintered to obtain a microwave ferroelectric material.

Embodiment 1

[0039] Embodiment 1: The preparation chemical formula is BaO-ZnO-SiO 2 Low dielectric microwave ferroelectric ceramics;

[0040] (1) Using analytically pure BaO, ZnO and SiO 2 Powder is used as raw material, after mixing according to the ratio of 1:1:1, zirconium balls are used as the medium and deionized water is used as the solvent, and the powder is mixed and stirred for 3 hours with a ball mill at a speed of 360r / min; the obtained slurry is dried and placed in the Pre-fired at 1100°C for 3 hours to obtain matrix ceramic powder;

[0041] (2) The matrix ceramic powder obtained is ball-milled again, and after drying, 3wt% polyvinyl alcohol (PVA) binder is added in the dry powder to granulate, and it is pressed under the pressure of 100MPa into a thickness and a diameter ratio of Cylindrical green samples of 0.4 to 0.6;

[0042] (3) After debinding the above green sample at a temperature of 550°C, raise the temperature to 1200°C at a rate of 5°C / min, and sinter in air for 3...

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Abstract

The present invention discloses low dielectric microwave ferroelectric ceramics and a preparation method thereof. The low dielectric microwave ferroelectric ceramics have chemical formula of xBaO-yZnO-zSiO2, wherein x, y and z satisfy the relations of: 1<=x<=2, 0<=y<=2, and 1<=z<=2. The preparation method comprises the following steps: (1) subjecting a mixture of BaO, ZnO and SiO2 to wet ball-milling treatment, drying and calcining to obtain xBaO-yZnO-zSiO2 matrix ceramic powder; (2) subjecting the matrix ceramic powder to wet ball-milling treatment, drying, adding polyvinyl alcohol, granulating, tabletting and sintering to obtain low dielectric microwave ferroelectric ceramics. Deionized water is used as a dispersant in ball mill treatment, in order to prepare a dense ferroelectric single phase; the preparation temperature is lower than the melting point of Cu or Ni; the prepared low dielectric microwave ferroelectric ceramics have the characteristics of excellent microwave dielectric properties and reducing resistance properties, small dielectric constant and low dielectric microwave loss, have adjustable tau f value by changing lattice structure, and can be used as a dielectric material of BME-MLCC.

Description

technical field [0001] The invention belongs to the technical field of microwave dielectric ceramics, and more specifically relates to a microwave dielectric ceramic with weak ferroelectricity and very low dielectric constant and a preparation method thereof. Background technique [0002] Microwave dielectric ceramics refer to ceramic materials used as dielectric materials in microwave frequency band (300MHz ~ 30GHz) circuits. Low-dielectric microwave ferroelectric ceramics refer to weak ferroelectric ceramic materials that can be applied in the microwave frequency band and have good microwave dielectric properties. The resonant frequency temperature coefficient can be adjusted by adjusting the position of the Curie temperature, and it has a dielectric constant. Low, low dielectric loss, weak ferroelectricity, and easy-to-adjust temperature characteristics. [0003] Microwave ferroelectric ceramics are typically used in microwave multilayer ceramic capacitors. Multi-layer ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/626C04B35/64
CPCC04B35/01C04B35/6261C04B35/6264C04B35/64C04B2235/3215C04B2235/3284C04B2235/3418C04B2235/6583C04B2235/76C04B2235/761C04B2235/767C04B2235/96
Inventor 雷文邹正雨吕文中范桂芬汪小红
Owner HUAZHONG UNIV OF SCI & TECH
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