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Microwave dielectric ceramic material with medium dielectric constant, and preparation method thereof

A microwave dielectric ceramic and electric constant technology, applied in the field of dielectric ceramic materials, can solve the problem of large frequency temperature coefficient, and achieve the effect of small frequency temperature coefficient and high quality factor

Inactive Publication Date: 2012-02-22
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the existing microwave dielectric ceramics with a large frequency temperature coefficient, and to provide a

Method used

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  • Microwave dielectric ceramic material with medium dielectric constant, and preparation method thereof
  • Microwave dielectric ceramic material with medium dielectric constant, and preparation method thereof
  • Microwave dielectric ceramic material with medium dielectric constant, and preparation method thereof

Examples

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Effect test

Embodiment 1

[0019] The chemical composition formula of microwave dielectric ceramics is Ca 4 La 2 Ti 5-x (Mg 1 / 3 Nb 2 / 3 ) x o 17 , where x=0.

[0020] CaCO with a purity greater than 99% 3 、TiO 2 and La 2 o 3 The original powder according to Ca 4 La 2 Ti 5 o 17 Chemical formula weighing ingredients; wet ball milling and mixing for 24 hours, the solvent is absolute ethanol, after drying, pre-calcine in an air atmosphere at 1300°C for 6 hours, then add 3% polyvinyl alcohol (PVA) aqueous solution to the pre-calcined powder, mix and dry , After granulating through a 100-mesh sieve, it was pressed into a cylindrical sample at 100 MPa, and finally sintered at 1540 °C for 4 hours in an air atmosphere. The microwave dielectric properties of the material are: ε r =71.8, Q× f =15070GHz,τ f =+125ppm / °C.

Embodiment 2

[0022] The chemical composition formula of microwave dielectric ceramics is Ca 4 La 2 Ti 5-x (Mg 1 / 3 Nb 2 / 3 ) x o 17 , where x=2.

[0023] CaCO with a purity greater than 99% 3 、TiO 2 and La 2 o 3 Nb 2 o 5 The original powder according to Ca 4 La 2 Ti 3 (Mg 1 / 3 Nb 2 / 3 ) 2 o 17 Chemical formula weighing ingredients; wet ball milling and mixing for 12 hours, the solvent is absolute ethanol, after drying, pre-calcine in an air atmosphere at 1300°C for 5 hours, then add 3% polyvinyl alcohol (PVA) aqueous solution to the pre-calcined powder, mix and dry Dry, pass through a 100-mesh sieve and granulate, then press into a cylindrical sample at 100MPa, and finally sinter at 1540 °C for 4 hours in an air atmosphere. The microwave dielectric properties of the material are: ε r =49.2, Q× f =16046GHz, τ f =31.5ppm / °C.

Embodiment 3

[0025] The chemical composition formula of microwave dielectric ceramics is Ca 4 La 2 Ti 5-x (Mg 1 / 3 Nb 2 / 3 ) x o 17 , where x=4.

[0026] CaCO with a purity greater than 99% 3 、TiO 2 and La 2 o 3 Nb 2 o 5 The original powder according to Ca 4 La 2 Ti (Mg 1 / 3 Nb 2 / 3 ) 4 o 17 Chemical formula weighing ingredients; wet ball milling and mixing for 20 hours, the solvent is absolute ethanol, after drying, pre-calcine in an air atmosphere at 1300°C for 4 hours, then add 3% polyvinyl alcohol (PVA) aqueous solution to the pre-calcined powder, mix and dry , After granulating through a 100-mesh sieve, it was pressed into a cylindrical sample at 100 MPa, and finally sintered at 1540 °C for 4 hours in an air atmosphere. The microwave dielectric properties of the material are: ε r =35.3, Q× f =21277GHz,τ f =-16.7ppm / °C.

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Abstract

The present invention discloses a microwave dielectric ceramic material with a medium dielectric constant, and a preparation method thereof. The preparation method comprises: mixing the following raw powders according to a chemical formula of Ca4La2Ti5-x(Mg1 / 3Nb2 / 3) xO17, wherein the raw powders comprise CaCO3, (MgCO3)4.Mg(OH)2.5H2O, TiO2, La2O3 and Nb2O5, the purities of the raw powders are more than 99%, x is more than or equal to 0, and less than or equal to 4; carrying out wet milling and mixing for 12-24 hours, wherein absolute alcohol is adopted as a solvent; drying, and then pre-burning for 4-6 hours at a temperature of 1300 DEG C under air atmosphere; adding an aqueous solution containing 3% of polyvinyl alcohol (PVA) to the pre-burned powders, then mixing and drying; carrying out screening through a sieve with 100 meshes, and pelletizing; pressing into a cylindrical sample under pressure of 100 MPa; finally sintering for 4 hours at the temperature of 1480-1560 DEG C under air atmosphere to obtain the microwave dielectric ceramic material. According to the present invention, the prepared microwave dielectric ceramic has a high-frequency dielectric constant epsilonr of 34-72, high quality factor Q*f and small frequency temperature coefficient tauf, and can be widely used in dielectric resonators, filters, dielectric antennas and other microwave devices.

Description

technical field [0001] The invention relates to a dielectric ceramic material, in particular to a medium dielectric constant microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] Microwave generally refers to electromagnetic waves with a frequency between 300MHz and 3000GHz and a wavelength between 0.1mm and 1m. Microwave dielectric ceramics refer to ceramics that are used as dielectric materials in microwave frequency band (mainly UHF, SHF frequency band) circuits and perform one or more functions. With the rapid development of microwave integrated circuits, a large number of microwave dielectric materials with medium and high dielectric constants, near-zero resonant frequency temperature coefficient and low dielectric loss are increasingly required for commercial microwave applications. Dielectric ceramic materials used in the microwave frequency band should meet the following requirements for dielectric properties: (1) High...

Claims

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Application Information

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IPC IPC(8): C04B35/462C04B35/50C04B35/495C04B35/622
Inventor 陈国华康晓玲狄洁昌徐华蕊张小文杨云
Owner GUILIN UNIV OF ELECTRONIC TECH
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