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Microwave ceramic medium material and preparation method thereof

A technology of dielectric materials and microwave ceramics, applied in electrical components, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve problems such as low dielectric loss, high dielectric loss, and increased microwave loss of materials to achieve low The effect of loss, low price, and adjustable dielectric constant

Inactive Publication Date: 2013-09-25
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, Mg 2 SiO 4 Ceramics have a large negative resonance frequency temperature coefficient (-67ppm / ℃); secondly, Mg 2 SiO 4 MgSiO is prone to appear in the ceramic sintering process 3 The second phase, this second phase has a higher dielectric loss, its appearance reduces the Mg 2 SiO 4 Microwave Dielectric Properties of Ceramics
to Mg 2 SiO 4 Ceramic research work has not stopped, people found that in SiO 2 With an excess ratio of 10% to 20%, relatively pure Mg can be obtained by sintering at 1160-1240°C 2 SiO 4 phase, but excess SiO 2 Also increases the microwave loss of the material

Method used

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  • Microwave ceramic medium material and preparation method thereof
  • Microwave ceramic medium material and preparation method thereof
  • Microwave ceramic medium material and preparation method thereof

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Embodiment 1

[0029] A preparation method of a microwave dielectric ceramic material, comprising the following steps:

[0030] Step 1: Ingredients. The purity is 99% basic magnesium carbonate, 99.5% titanium dioxide, and 99.5% calcium carbonate as raw materials, according to (1-x)MgTiO 3 -xMg 2 SiO 4 -yCaTiO 3 Control the ratio, where x=0, y=0.05; and add the modified additive MnCO 3 、Co 2 o 3 , CeO 2 and Nb 2 o 5 , wherein each component of the modified additive accounts for the entire target product, that is, the percentage content of the total mass of the microwave dielectric ceramic material is MnCO 3 : 0.4%, Co 2 o 3 : 0.2%, CeO 2 : 0.3%, Nb 2 o 5 : 0.7%.

[0031] Step 2: Ball milling. The raw materials prepared in step 1 are ball milled. The specific ball milling process is as follows: in a nylon ball milling tank, use zirconia balls as balls, deionized water as a ball milling solvent, and ball mill for 5 hours according to the weight ratio of material: ball: water = ...

Embodiment 2

[0038] A preparation method of a microwave dielectric ceramic material, comprising the following steps:

[0039] Step 1: Synthesis of Mg 2 SiO 4 Main crystal phase powder. Using basic magnesium carbonate with a purity of 99% and silicon dioxide with a purity of 99.5% as raw materials, the molar ratio of Mg and Si is controlled to be Mg:Si=2:1. The prepared raw materials are ball-milled, and the ball-milled materials are dried at 100° C. and passed through a 40-mesh sieve. The specific ball milling process is as follows: in a nylon ball milling tank, use zirconia balls as grinding balls, deionized water as a ball milling solvent, and ball mill for 6 hours according to the weight ratio of material: ball: water = 1:5:4. Pre-burn the dried material at 1320°C for 3 hours until Mg 2 SiO 4 Main crystal phase powder.

[0040] Step 2: Ingredients. The Mg obtained in step 1 2 SiO 4 The main crystal phase powder and basic magnesium carbonate with a purity of 99%, 99.5% titanium ...

Embodiment 3

[0048] Step 1: Synthesis of Mg 2 SiO 4 Main crystal phase powder. Using basic magnesium carbonate with a purity of 99% and silicon dioxide with a purity of 99.5% as raw materials, the molar ratio of Mg and Si is controlled to be Mg:Si=2:1. The prepared raw materials are ball-milled, and the ball-milled materials are dried at 100° C. and passed through a 40-mesh sieve. The specific ball milling process is as follows: in a nylon ball milling tank, use zirconia balls as grinding balls, deionized water as a ball milling solvent, and ball mill for 6 hours according to the weight ratio of material: ball: water = 1:5:4. Pre-burn the dried material at 1300°C for 4 hours until Mg 2 SiO 4 Main crystal phase powder.

[0049] Step 2: Ingredients. The Mg obtained in step 1 2 SiO 4The main crystal phase powder and basic magnesium carbonate with a purity of 99%, 99.5% titanium dioxide, and 99.5% calcium carbonate are used as raw materials, according to (1-x)MgTiO 3 -xMg 2 SiO 4 -y...

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Abstract

The invention provides a microwave ceramic medium material and a preparation method thereof, belonging to an electronic information functional material technology field. The microwave ceramic medium material contains a principal crystalline phase structure and a property-modifying additive; wherein he principal crystalline phase structure is represented by the following formula (1-x)MgTiO3-xMg2SiO4-yCaTiO3, wherein 0<=x<=0.8, and 0.05<=y<=0.07; and the property-modifying additive contains MnCO3, Co2O3, CeO2 and Nb2O5, and mass potion of the property-modifying additive is 0.5-3% of total mass of the whole microwave medium ceramic. The preparation method uses a traditional solid phase sintering method, and has characteristics of simpleness, easy control, environmental protection and low cost. The material has a high Qf value which is in a range from 65000GHz to 85000GHz, a relative dielectric constant Epsilon r is between 10 and 22, and a resonant frequency temperature coefficient is in a range of +-10ppm / DEG C.

Description

technical field [0001] The invention belongs to the technical field of electronic information functional materials and devices, and in particular relates to a microwave ceramic dielectric material and a preparation method thereof. Background technique [0002] In recent years, with the rapid development of microwave communication technology, research on high-performance microwave dielectric ceramics has been paid more and more attention. Microwave dielectric ceramics can be used to make microwave components such as filters, resonators, and dielectric waveguide circuits, and dielectric substrates for microwave circuits. They have been widely used in many fields such as satellites, televisions, radars, mobile communications, and electronic computers. As early as 2009, the State Council put forward the importance of developing dielectric ceramics with serialized dielectric constant and excellent microwave dielectric properties in the document "Outline of Electronic Information ...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/622H01L41/187H10N30/853
Inventor 唐斌李皓孙成礼周晓华钟朝位张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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