Novel method for lowering sintering temperature of corundum-type Mg4Ta2O9 microwave dielectric ceramic by doping H3BO3

A microwave dielectric ceramic, mg4ta2o9 technology, applied in the field of electronic ceramics preparation and application, to achieve the effect of improving sintering characteristics and good microwave dielectric properties

Inactive Publication Date: 2014-10-29
UNIV OF JINAN
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, about the system of corundum type Mg 4 Ta 2 o 9 Ceramics use wet chemical process to

Method used

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  • Novel method for lowering sintering temperature of corundum-type Mg4Ta2O9 microwave dielectric ceramic by doping H3BO3
  • Novel method for lowering sintering temperature of corundum-type Mg4Ta2O9 microwave dielectric ceramic by doping H3BO3
  • Novel method for lowering sintering temperature of corundum-type Mg4Ta2O9 microwave dielectric ceramic by doping H3BO3

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] according to figure 1 Utilization of H based on wet chemical process 3 BO 3 Preparation of Corundum Mg by Doping 4 Ta 2 o 9 Ceramic process flow diagram with the following steps:

[0037] 1) prepare the citric acid aqueous solution of Mg ion

[0038] (a) According to Mg 4 Ta 2 o 9 The stoichiometric ratio of the microwave ceramic phase, adjust the MgO (or Mg (NO 3 ) 2 .6H 2 O) / Ta 2 o 5 The molar ratio is 4 / 1+x (03 ) 2 .6H 2 A total of 30.76 grams of O was dissolved in 200ml of ionized water and magnetically stirred to form a colorless and transparent solution;

[0039] (b) take by weighing 92.23 grams of citric acid, add in the above-mentioned solution and stir, impel citric acid and Mg ion to form complex, make colorless transparent Mg ion citric acid aqueous solution;

[0040] 2) prepare the citric acid aqueous solution of Ta ion

[0041] (a) According to Mg 4 Ta 2 o 9 For the stoichiometric ratio of the microwave ceramic phase, 13.2496 grams of ...

Embodiment 2

[0051] according to figure 1 Utilization of H based on wet chemical process 3 BO 3 Preparation of Corundum Mg by Doping 4 Ta 2 o 9 Ceramic process flow diagram with the following steps:

[0052] 1) prepare the citric acid aqueous solution of Mg ion

[0053] (a) According to Mg 4 Ta 2 o 9 The stoichiometric ratio of the microwave ceramic phase, adjust the MgO (or Mg (NO 3 ) 2 .6H 2 O) / Ta 2 o 5 The molar ratio is 4 / 1+x (03 ) 2 .6H 2 A total of 61.2 grams of O was dissolved in 200ml of ionized water and magnetically stirred to form a colorless and transparent solution;

[0054] (b) take by weighing 276.68 grams of citric acid, add in the above-mentioned solution and stir, impel citric acid and Mg ion to form complex, make colorless transparent Mg ion citric acid aqueous solution;

[0055] 2) prepare the citric acid aqueous solution of Ta ion

[0056] (a) According to Mg 4 Ta 2 o 9 The stoichiometric ratio of the microwave ceramic phase is to weigh 26.4992 gr...

Embodiment 3

[0066] according to figure 1 Utilization of H based on wet chemical process 3 BO 3 Preparation of Corundum Mg by Doping 4 Ta 2 o 9 Ceramic process flow diagram with the following steps:

[0067] 1) prepare the citric acid aqueous solution of Mg ion

[0068] (a) According to Mg 4 Ta 2 o 9 The stoichiometric ratio of the microwave ceramic phase, adjust the MgO (or Mg (NO 3 ) 2 .6H 2 O) / Ta 2 o 5 The molar ratio is 4 / 1+x (03 ) 2 .6H 2 A total of 10.256 grams of O was dissolved in 200ml of ionized water and stirred magnetically to form a colorless and transparent solution;

[0069] (b) take by weighing 9.6 grams of citric acid, add in the above-mentioned solution and stir, impel citric acid and Mg ion to form complex, make colorless transparent Mg ion citric acid aqueous solution;

[0070] 2) prepare the citric acid aqueous solution of Ta ion

[0071] (a) According to Mg 4 Ta 2 o 9 For the stoichiometric ratio of the microwave ceramic phase, we weigh 4.4189 gr...

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Abstract

The invention belongs to the technical field of preparation and application of electronic ceramic, and particularly relates to a novel method for lowering sintering temperature of corundum-type Mg4Ta2O9 microwave dielectric ceramic by doping H3BO3. The technical scheme is as follows: the method for lowering sintering temperature of corundum-type Mg4Ta2O9 microwave dielectric ceramic by doping H3BO3 is based on a wet chemical technique. The method comprises the following steps: 1) preparing a Mg ion citric acid water solution; 2) preparing a Ta ion citric acid water solution; 3) preparing a H3BO3-doped Mg-Ta precursor by a sol-gel process, synthesizing a dielectric ceramic nano precursor, and sintering the ceramic. The H3BO3-doped Mg4Ta2O9 ceramic precursor powder is firstly synthesized, so that the ceramic has the advantages of low synthesis temperature, uniform ceramic particles, favorable dispersity, pure phase, nano size, high specific surface energy, higher activity and the like; and in the subsequent sintering process, the function of the H3BO3 as the sintering fluxing agent is highlighted, thereby obviously lowering the sintering temperature by 200-300 DEG C and maintaining favorable microwave dielectric properties.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of electronic ceramics, and in particular relates to a 3 BO 3 doped corundum type Mg 4 Ta 2 o 9 A new method for the sintering temperature of microwave dielectric ceramics. Background technique [0002] With the rapid development of the microwave communication industry, the demand for miniaturized and high-performance microwave circuits and microwave devices in the fields of mobile communications, car phones, TV satellites, military radars, global positioning systems, and portable phones is increasing, requiring continuous development A new type of microwave dielectric material with more superior performance. Based on the research trends of microwave dielectric ceramics, Japanese scholar Hitoshi Ohsato combined the needs of the application field and divided microwave dielectric ceramic materials into three categories: 1) low dielectric constant ( ε r <20, Q·?>50,00...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/64
Inventor 吴海涛梅全静李从英郭靖栋杨长红
Owner UNIV OF JINAN
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