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Microwave dielectric ceramic material and preparation method therefor

A microwave dielectric ceramic and ceramic technology, which is applied in the field of electronic ceramics, can solve the problems of high dielectric loss, high sintering cost, and cannot meet the requirements of low insertion loss microwave devices, and achieves the effect of small temperature coefficient of resonant frequency and high quality factor Qf

Active Publication Date: 2016-11-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

MgO-CaO-TiO 2 (MCT) system ceramic material is a good microwave dielectric ceramic material. However, the calcium titanate phase has a high dielectric loss, which cannot meet the requirements of low insertion loss microwave devices. MgO-CaO-TiO 2 The sintering temperature of the system ceramic material is 1400-1450 °C, because of the high sintering temperature, the sintering cost is high, which limits the application of the MCT system ceramic material

Method used

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  • Microwave dielectric ceramic material and preparation method therefor

Examples

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Embodiment 1

[0035] A common calcium-doped (MgCa)TiO 3 The preparation method of system ceramics, concrete steps are as follows:

[0036] Step 1: batching; Magnesium carbonate basic (4MgCO 3 ·Mg(OH) 2 5H2O) powder, calcium oxide (CaO) powder and titanium oxide (TiO2) powder are 4MgCO in molar ratio 3 ·Mg(OH) 2 ·5H 2 O: CaO: TiO 2 = 19:5:100 component batch to form 100 grams of (Mg 0.95 Ca 0.05 )TiO 3 The mixture; the mixture is deionized water as a solvent, ball milling and mixing for 6 hours to obtain a ceramic slurry;

[0037] Step 2: Dry the ceramic slurry prepared in Step 1 and pre-fire to obtain ceramic material, the pre-fire temperature is 950°C, and the pre-fire time is 5 hours;

[0038] Step 3: ball milling and mixing; do not add any composite dopant to the ceramic material obtained in step 2, use deionized water as a solvent, and ball mill and mix for 6 hours to obtain a ball mill;

[0039] Step 4: granulation and molding; drying the ball abrasive obtained in step 3, add...

Embodiment 2

[0042] A preparation method of a microwave dielectric ceramic material, the specific steps are as follows:

[0043] Step 1: batching; Magnesium carbonate basic (4MgCO 3 ·Mg(OH) 2 ·5H 2 O) powder, calcium oxide (CaO) powder and titanium oxide (TiO 2 ) powder is 4MgCO in molar ratio 3 ·Mg(OH) 2 ·5H 2 O: CaO: TiO 2 = 19:5:100 component batch to form 100 grams of (Mg 0.95 Ca 0.05 )TiO 3 The mixture; the mixture is deionized water as a solvent, ball milling and mixing for 5 hours to obtain ceramic slurry;

[0044] Step 2: Dry the ceramic slurry prepared in step 1 and pre-fire to obtain ceramic material, the pre-fire temperature is 1000°C, and the pre-fire time is 6 hours;

[0045] Step 3: ball milling and mixing; add 0.38 grams of Nd to the ceramic material obtained in step 2 2 o 3 , 0.5 grams of ZnO and 0.12 grams of Al 2 o 3 Composite dopant formed, using deionized water as solvent, ball milling and mixing for 5 hours to mix evenly to obtain ball milling material; ...

Embodiment 3

[0049] A preparation method of a microwave dielectric ceramic material, the specific steps are as follows:

[0050] Step 1: batching; Magnesium carbonate basic (4MgCO 3 ·Mg(OH) 2 ·5H 2 O) powder, calcium oxide (CaO) powder and titanium oxide (TiO 2 ) powder is 4MgCO in molar ratio 3 ·Mg(OH) 2 ·5H 2 O: CaO: TiO 2 = 19:5:100 component batch to form 100 grams of (Mg 0.95 Ca 0.05 )TiO 3 The mixture; the mixture is deionized water as a solvent, ball milling and mixing for 5 hours to obtain ceramic slurry;

[0051] Step 2: Dry the ceramic slurry prepared in Step 1 and pre-fire to obtain ceramic material, the pre-fire temperature is 950°C, and the pre-fire time is 5 hours;

[0052] Step 3: ball milling and mixing; add 0.76 grams of Nd to the ceramic material obtained in step 2 2 o 3 , 0.5 grams of ZnO and 0.5 grams of Al 2 o 3 Composite dopant formed, using deionized water as solvent, ball milling and mixing for 6 hours to mix uniformly to obtain ball milling material; ...

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Abstract

The invention discloses a microwave dielectric ceramic material and a preparation method therefor and belongs to the technical field of electronic ceramics. The ceramic material disclosed by the invention is prepared from (MgCa)TiO3 system ceramics and a composite burning improver through carrying out ball-milling mixing, granulating, shaping, binder burnout and sintering; a chemical formula of the (MgCa)TiO3 system ceramics is aMgTiO3.bCaTiO3, wherein a is greater than 0.92 and is smaller than 0.98, and b is greater than 0.02 and is smaller than 0.08; and the composite burning improver contains Al2O3, ZnO and Nd2O3. According to the ceramic material prepared by the preparation method, a Q*_f value is 71,000GHz to 82,000GHz, a relative dielectric constant [epsilon]r is 19 to 21, and a temperature coefficient of resonance frequency is + / -10ppm per DEG C; and the microwave dielectric ceramic material disclosed by the invention is simple in preparation process, is easy to produce industrially and can be extensively applied to microwave devices such as wave filters and oscillators.

Description

technical field [0001] The invention belongs to the field of electronic ceramics, in particular to a microwave dielectric ceramic material and a preparation method thereof. Background technique [0002] In recent years, due to the rapid development of microwave communication, the demand for miniaturized and high-performance microwave circuits and microwave devices in modern communication technology fields such as mobile communication, satellite communication, global satellite positioning, Bluetooth, and wireless local area network is increasing. The way to realize the miniaturization, high stability and low cost of microwave equipment is the integration of microwave circuits. Traditional metal resonators and metal waveguides are too bulky and heavy, which limits the development of microwave integrated circuits, and microwave dielectric ceramics can solve these problems well. [0003] Microwave dielectric ceramic materials refer to ceramics that are used as dielectric materi...

Claims

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Application Information

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IPC IPC(8): C04B35/465C04B35/622
CPCC04B35/465C04B35/622C04B2235/3217C04B2235/3224C04B2235/3284
Inventor 钟朝位刘稷陶煜陈松张树人
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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