Low temperature synthesis of ultra-fine ZnO-SiO2 microwave dielectric ceramic powder by sol-gel method

A microwave dielectric ceramic and gel method technology is applied in the field of material science to achieve the effects of lowering synthesis temperature, increasing Q×f value and lower price

Inactive Publication Date: 2008-07-23
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But so far, there has not been any preparation of ultrafine Zn by wet chemical method (including sol-gel method). 2 SiO 4 Ceramics to meet the miniaturization of ceramic devices reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Weigh 1mol of Zn(NO 3 ) 2 .6H 2 O is dissolved in 475 ml of absolute ethanol to form an absolute ethanol solution of zinc nitrate with a concentration of about 2.0 mol / l; mix 0.5 mol of ethyl orthosilicate with 110 ml of absolute ethanol to form ethyl orthosilicate ethanol solution; the above two solutions were mixed, stirred evenly, and 550 milliliters of absolute ethanol was added to make the zinc concentration 0.8 mol / l. Then add 3 mol of deionized water, 8 grams of concentrated nitric acid with a concentration of 65-68%, and 20 grams of PEG400, and the pH value of the solution is 1.5.

[0020] After the above mixed solution was stirred evenly, it was placed in a water bath at 30°C to obtain a colorless and transparent gel. The gel was taken out and placed in a tray, and dried at 80°C for 24 hours to obtain a crispy substance.

[0021] Grind the above-mentioned brittle substance, put it into a high-alumina crucible, and calcinate at 800°C for 1 hour to obtain whit...

Embodiment 2

[0025] Weigh 0.5mol of Zn(CH 3 COOH) 2 2H 2 O is dissolved in 320 ml of absolute ethanol to form a zinc acetate absolute ethanol solution with a concentration of about 1.5 mol / l; mix 0.25 mol of tetraethyl orthosilicate with 115 ml of absolute ethanol to form tetraethyl orthosilicate ethanol solution; mix the above two solutions, stir evenly, add 400 ml of absolute ethanol to make the zinc concentration 0.6mol / l. Then add 2mol deionized water, 3 gram concentrations and be 65~68% concentrated nitric acid and 4 gram acrylic acid, 10 gram PEG1000, the pH value of solution is 2.

[0026] After the above mixed solution was stirred evenly, it was placed in a water bath at 35°C to obtain a colorless and transparent gel. The gel was taken out and placed in a tray, and dried at 90°C for 24 hours to obtain a crispy substance.

[0027] Grind the above-mentioned brittle substance, put it into a high-alumina crucible, and calcinate at 850°C for 1 hour to obtain white ZnO-SiO 2 Microwav...

Embodiment 3

[0031] Weigh 0.5mol of Zncl 2 Dissolve in 115 ml of absolute ethanol to form a zinc nitrate absolute ethanol solution with a concentration of about 4 mol / l; mix 0.25 mol of ethyl orthosilicate with 110 ml of absolute ethanol to form an ethyl orthosilicate ethanol solution; The above two solutions were mixed, stirred evenly, and 250 ml of absolute ethanol was added to make the zinc concentration 1.0 mol / l. Then add 1mol deionized water, 2.5 grams of concentration and be 65~68% concentrated nitric acid, 8 grams of PEG1000, the pH value of solution is 2.5.

[0032]After the above mixed solution was stirred evenly, it was placed in a water bath at 30°C to obtain a colorless and transparent gel. The gel was taken out and placed in a tray, and dried at 80°C for 24 hours to obtain a crispy substance.

[0033] Grind the above-mentioned brittle substance, put it into a high-alumina crucible, and calcinate at 800°C for 1 hour to obtain white ZnO-SiO 2 Microwave dielectric ceramic powd...

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Abstract

The invention discloses a preparation method of sol-gel to synthesize the ultrafine microwave dielectric ceramic powder of ZnO-SiO2 in the low temperature, which comprises the steps that: the zinc salt and the tetraethyl orthosilicate are respectively dissolved in the anhydrous ethanol to form the ethanol solution of zinc salt and the ethanol solution of tetraethyl orthosilicate; the two solutions are stirred and mixed with the mole ratio of Zn to Si being 2 : 1, then proper anhydrous ethanol is added to control the density of the zinc salt in the mixed solution within a range of 0.5 to 1 mol / l; deionized water is added to promote hydrolytic polymerization; at least one of nitric acid and acrylic acid is added dropwise to adjust the pH value; proper dispersing agent is added to overcome the powder agglomeration; and the gel is obtained after even stirring, sealing and standing of the obtained solution, and then the obtained gel is dried and calcined to obtain the ultrafine microwave dielectric ceramic powder of ZnO-SiO2. The preparation method has the advantages that the ultrafine powder with an adjustable particle size of 80 to 200 nm can be calcined and synthesized under the low temperature condition of 800 to 850 DEG C; and the powder has good microwave property after sintering.

Description

technical field [0001] The present invention relates to ultrafine ZnO-SiO 2 Preparation method of microwave dielectric ceramic powder, especially involving low-temperature synthesis of ultrafine ZnO-SiO by sol-gel method 2 The method for microwave dielectric ceramic powder belongs to the technical field of material science. Background technique [0002] With the rapid development of information technology, high frequency and miniaturization have become the basic characteristics of advanced electronic components. With the further shrinking of the volume of ceramic components, the dielectric layer in the chip multilayer device structure is getting thinner and thinner. Therefore, an important way to prepare ultra-thin dielectric layers in the future is to use ultra-fine powder or even nano-scale powder. [0003] Guo.Y et al. in "J.Eur.Ceram.Soc", 2006, 26:16-18 "Characterization and dielectric behavior of willemite and TiO 2 -doped willemite ceramics atmillimeter-wave freque...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/624C04B35/14C04B35/453
Inventor 张启龙史灵杭杨辉邹佳丽
Owner ZHEJIANG UNIV
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