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Low-loss microwave dielectric ceramic material and preparation method thereof

A technology of microwave dielectric ceramics and low loss, applied in the field of microwave ceramic dielectric materials and their preparation, to achieve the effect of adjustable dielectric constant and low price

Inactive Publication Date: 2014-03-19
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, it is possible to achieve a dielectric constant ε r It can be adjusted from 9 to 20, and the temperature coefficient is controlled within ±10ppm / ℃. At the same time, there are very few reports on the material system with Q×f between 65000 and 85000 GHz. At present, it is urgent to develop a simple process and low raw material cost. Microwave dielectric ceramics with low loss characteristics and adjustable dielectric constant series to meet the application requirements of the microwave communication industry

Method used

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  • Low-loss microwave dielectric ceramic material and preparation method thereof
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  • Low-loss microwave dielectric ceramic material and preparation method thereof

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Embodiment 1

[0029] A method for preparing a low-loss microwave dielectric ceramic material, comprising the following steps:

[0030] Step 1: Synthesis of Mg 2 SiO 4 Crystalline powder: Basic magnesium carbonate with a purity of 99% and silicon dioxide with a purity of 99.5% are used as raw materials, and the molar ratio of Mg and Si is controlled to be Mg:Si=2.03:1. 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 the balls, deionized water as the ball milling solvent, and ball mill for 6 hours according to the weight ratio of materials: balls: water = 1:5:4. Pre-fire the dried material at 1260°C for 3 hours to obtain MgO containing a small amount of MgO powder 2 SiO 4 Crystal phase powder.

[0031] Step 2: Ingredients; the purity is 99% basic magnesium carbonate, 99.5% titanium dioxide, and 99.5% calciu...

Embodiment 2

[0039] A preparation method of a microwave dielectric ceramic material, comprising the following steps:

[0040] Step 1: Synthesis of Mg 2 SiO 4 Crystal phase powder; use basic magnesium carbonate with a purity of 99% and silicon dioxide with a purity of 99.5% as raw materials, and control the molar ratio of Mg and Si to Mg:Si=2.05:1 for batching. 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 the balls, deionized water as the ball milling solvent, and ball mill for 6 hours according to the weight ratio of materials: balls: water = 1:5:4. The dried material was pre-fired at 1220°C for 3 hours, and the Mg containing a small amount of MgO powder 2 SiO 4 Crystal phase powder.

[0041] Step 2: batching; the Mg obtained in step 1 2 SiO 4 The main crystal phase powder and basic magnesium carbon...

Embodiment 3

[0049] Step 1: Synthesis of Mg 2 SiO 4 Crystal phase powder: 99% pure magnesium carbonate and 99.5% silicon dioxide are used as raw materials, and the molar ratio of Mg and Si is controlled to be Mg:Si=2.07:1. 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 the balls, deionized water as the ball milling solvent, and ball mill for 6 hours according to the weight ratio of materials: balls: water = 1:5:4. The dried material was pre-fired at 1220°C for 3 hours, and the Mg containing a small amount of MgO powder 2 SiO 4 Crystal phase powder.

[0050] Step 2: batching; 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 dioxide, and 99.5% calcium carbonate are used as raw materials, and the proportion is controlled acc...

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Abstract

The invention relates to a low-loss microwave dielectric ceramic material and a preparation method thereof, which belongs to the technical field of an electronic information functional material and device. The low-loss microwave dielectric ceramic material comprises a main crystal phase and additives, wherein the main crystal phase comprises MgTiO3, Mg2SiO4 and CaTiO3, and the main crystal phase contains little Mg2TiO4; the additives comprise MnO2, Co2O3, CeO2 and Nb2O5; the loss of the material is detected to be low (Qxf falls in the range of 65000 to 85000GHz), the dielectric constant is adjustable (between 9 and 20), the frequency temperature coefficient is stable (within + / -10ppm / DEG C), the machinability is good, and the application requirement of a microwave communication industry can be met. The preparation method is a solid-phase sintering method and has the characteristics of simplicity, environmental friendliness and low cost, and is easy to control.

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] Microwave dielectric ceramics is a new type of functional electronic ceramics developed rapidly in the past 30 years. It has the characteristics of low loss, small frequency temperature coefficient, and high dielectric constant. 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 ...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/20C04B35/622
Inventor 唐斌李皓袁颖钟朝位张树人
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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