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Preparation method for ultrafine powder body of SiO2-based composite oxide system glass

A composite oxide and ultra-fine powder technology, which is applied in the field of functional ceramic materials, can solve the problems of dielectric ceramic capacitor preparation process, difficulty in structure and dielectric properties, difficulty in uniform mixing, etc., and achieve good application prospects, good repeatability, The effect of simple synthesis process

Inactive Publication Date: 2013-04-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the preparation process of dielectric ceramics, it is difficult for the glass powder with large particle size to mix evenly with the powder of dielectric ceramics
In particular, in recent years, the use of ultra-fine dielectric ceramic powders to prepare dielectric ceramic containers has become more and more common, and the uniform mixing of large particle glass powders and ultra-fine dielectric ceramic powders is more difficult, giving the control of dielectric ceramic capacitors. The preparation process, structure and dielectric properties all cause difficulties

Method used

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  • Preparation method for ultrafine powder body of SiO2-based composite oxide system glass
  • Preparation method for ultrafine powder body of SiO2-based composite oxide system glass
  • Preparation method for ultrafine powder body of SiO2-based composite oxide system glass

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Effect test

Embodiment 1

[0027] (1) Preparation of precursor solution: according to the mass ratio of glass composition 61% SiO 2 , 25% Al 2 o 3 , 7%CaO, 5%MgO, 1%BaO, 1%ZnO, weigh tetraethylorthosilicate, aluminum nitrate, calcium nitrate, magnesium nitrate, barium nitrate and zinc nitrate, and tetraethylorthosilicate Dissolve in absolute ethanol and add an appropriate amount of deionized water. The volume ratio of absolute ethanol to ionized water is 5:1. Add acetic acid dropwise to adjust the pH value of the solution to 1 to obtain a clear and transparent solution A. Add aluminum nitrate and calcium nitrate , magnesium nitrate, barium nitrate, zinc nitrate and citric acid were dissolved in absolute ethanol to obtain a clear and transparent solution B, and then the two solutions A and B were mixed, and a clear and transparent precursor was obtained after thermal stirring at 60 °C Solution, in the precursor solution, the molar ratio of citric acid and the total amount of reactant cations is 2: 1, a...

Embodiment 2

[0034] (1) Preparation of precursor solution: according to the mass ratio of glass composition 53% SiO 2 , 35%Al 2 o3 , 3%CaO, 4%MgO, 1%BaO, 4%ZnO ratio, weigh tetraethyl orthosilicate, aluminum nitrate, calcium nitrate, magnesium nitrate, barium nitrate and zinc nitrate, and tetraethyl orthosilicate Dissolve in absolute ethanol and add an appropriate amount of deionized water. The volume ratio of absolute ethanol to deionized water is 7:1. Add acetic acid dropwise to adjust the pH of the solution to 1 to obtain a clear and transparent solution A. Aluminum nitrate, Dissolve calcium nitrate, magnesium nitrate, barium nitrate, zinc nitrate and citric acid in absolute ethanol to obtain a clear and transparent solution B, then mix the two solutions A and B, and heat and stir at 60°C to obtain a clear and transparent solution The precursor solution, the molar ratio of citric acid and reactant cation total amount in the precursor solution is 1: 1, and the reactant cation in the pre...

Embodiment 3

[0038] (1) Preparation of precursor solution: according to the mass ratio of glass composition 68% SiO 2 , 18%Al 2 o 3 , 7%CaO, 2%MgO, 4%BaO, 1%ZnO ratio, weigh tetraethyl orthosilicate, aluminum nitrate, calcium nitrate, magnesium nitrate, barium nitrate and zinc nitrate, tetraethyl orthosilicate Dissolve in absolute ethanol and add an appropriate amount of deionized water. The volume ratio of absolute ethanol to deionized water is 6:1. Add acetic acid dropwise to adjust the pH of the solution to 1 to obtain a clear and transparent solution A. Aluminum nitrate, Dissolve calcium nitrate, magnesium nitrate, barium nitrate, zinc nitrate and citric acid in absolute ethanol to obtain a clear and transparent solution B, then mix the two solutions A and B, and heat and stir at 60°C to obtain a clear and transparent solution The precursor solution, the molar ratio of citric acid and reactant cation total amount in the precursor solution is 3: 1, and the reactant cation in the precu...

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Abstract

The invention provides a preparation method for an ultrafine powder body of SiO2-based composite oxide system glass. The ultrafine powder body of the SiO2-based composite oxide system glass is prepared according to the following glass components by weight percent: 52-68% of SiO2, 18-34% of Al2O3, 3-11% of CaO, 2-8% of MgO, 1-4% of BaO and 1-4% of ZnO. The preparation method comprises the steps ofpreparing precursor solutions, and preparing solid precursors and glass power bodies. The method has the advantages of simple and easy process, low preparation temperature, good repeatability and fine and uniform particles of the prepared glass powder body. The glass powder body prepared by the method can be used as a sintering assistant for BaTiO3-based dielectric ceramics, and has the function of obviously reducing the sintering and densifying temperature of the dielectric ceramics.

Description

technical field [0001] The invention relates to the field of functional ceramic materials, in particular to a SiO 2 The invention discloses a method for preparing ultrafine powder of glass based composite oxide system. Background technique [0002] BaTiO 3 The base dielectric has excellent dielectric properties and is an important material for making large-capacity, small-size ceramic capacitors. BaTiO 3 The sintering temperature of the base dielectric ceramic is relatively high (1300-1350 ℃), which increases the preparation cost of the ceramic capacitor. [0003] Adding oxide system sintering aid is to reduce the BaTiO 3 A common approach to the sintering temperature of base dielectric ceramics. PbO, Li 2 O, Na 2 O, K 2 Oxide and other oxides are commonly used sintering aids, but the use of PbO as a sintering aid will cause environmental pollution problems. Using Li 2 O, Na 2 O, K 2 When alkali metal oxides such as O are used as sintering aids, the compressive st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C12/00C04B35/63C04B35/468
Inventor 徐庆黄端平石鑫刘韩星陈文张枫
Owner WUHAN UNIV OF TECH
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