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A kind of barium strontium zirconate titanate ceramic and its preparation method and application

A technology of strontium barium zirconate titanate and zirconium titanate, which is applied in the field of strontium zirconate titanate ceramics and its preparation, can solve the problems of reducing the electrical card performance of the material and the difficulty of the electrical card effect, and achieve easy industrial process production and preparation The method is simple and the effect of increasing the polarization intensity

Active Publication Date: 2021-01-26
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, among the lead-free ferroelectric ceramics, the barium titanate-based system shows good electrical card performance, but its Curie point is too high (T C-BTO3 =120°C), although the first-order phase transition can bring high electrical card performance, but the narrow temperature range makes it difficult to apply the high electrical card effect in the actual production process, although B-site doping (such as Zr 4+ Ion substitution doping Ti 4+ ) can make the Curie point move to the low temperature direction, and at the same time, the high-performance temperature range is widened, and the temperature stability is improved, but the transition from the normal ferroelectric state to the relaxed ferroelectric state caused by doping reduces the electric card of the material. performance

Method used

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  • A kind of barium strontium zirconate titanate ceramic and its preparation method and application
  • A kind of barium strontium zirconate titanate ceramic and its preparation method and application
  • A kind of barium strontium zirconate titanate ceramic and its preparation method and application

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Experimental program
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Effect test

Embodiment 1

[0069] BaCO with a purity of 99% 3 , ZrO 2 and TiO 2 Press BaZr 0.15 Ti 0.85 o 3 Carry out stoichiometric ratio to form a mixture, add absolute ethanol and zirconium balls, BaCO 3 , ZrO 2 and TiO 2 The volume ratio of the total volume, absolute ethanol and zirconium balls is 1:1:1, and the planetary ball mill is carried out for 24 hours to obtain a mixed material, and then the slurry is filtered out and dried to obtain a dry powder mixed with raw materials;

[0070] Calcinate the obtained dry powder at 1325°C for 2 hours, and after 8 hours of secondary ball milling, add the binder solution according to the mass ratio of dry powder and binder solution at 10:1, wherein the binder solution is 5wt% PVB ethanol solution , evenly grind and granulate to obtain powder particles;

[0071] Press the obtained powder into a regular disc with a diameter of about 12 mm and a thickness of about 1 mm using a die, and undergo cold isostatic pressing at 200 MPa to obtain a ceramic green...

Embodiment 2

[0074] BaCO with a purity of 99% 3 , SrCO 3 , ZrO 2 and TiO 2 Raw material according to Ba 0.85 Sr 0.15 Zr 0.15 Ti 0.85 o 3 The stoichiometric ratio is made into a mixture, adding absolute ethanol and zirconium balls, BaCO 3 , SrCO 3 , ZrO 2 and TiO 2 The volume ratio of total volume, absolute ethanol and zirconium balls is 1:1:1, planetary ball milling 24 hours obtains mixed material, then filter out slurry, dry, obtain the dry powder of raw material mixing;

[0075] Calcinate the dry powder at 1325°C for 2 hours, and after 8 hours of secondary ball milling, add the binder solution according to the mass ratio of dry powder: binder solution of 10:1, where the binder solution is 5wt% PVB ethanol solution, and grind evenly to produce Particles, to obtain powder particles;

[0076] Press the obtained powder into a regular disc with a diameter of about 12 mm and a thickness of about 1 mm using a die, and undergo cold isostatic pressing at 200 MPa to obtain a ceramic gr...

Embodiment 3

[0079] BaCO with a purity of 99% 3 , SrCO 3 , ZrO 2 and TiO 2 Raw material according to Ba 0.80 Sr 0.20 Zr 0.15 Ti 0.85 o 3 The stoichiometric ratio is made into a mixture, adding absolute ethanol and zirconium balls, BaCO 3 , SrCO 3 , ZrO 2 and TiO 2 The volume ratio of total volume, absolute ethanol and zirconium ball is 1:1:1, planetary ball mill 24h obtains mixed material, then filter out slurry, dry, obtain the dry powder of raw material mixing;

[0080] Calcinate the obtained dry powder at 1330°C for 2 hours, and after 8 hours of secondary ball milling, add the binder solution according to the dry powder: binder solution mass ratio of 10:1, wherein the binder solution is 5wt% PVB ethanol solution, Uniformly grind and granulate to obtain powder particles;

[0081] Press the obtained powder into a regular disc with a diameter of about 12 mm and a thickness of about 1 mm using a die, and undergo cold isostatic pressing at 200 MPa to obtain a ceramic green body; ...

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Abstract

The invention provides a barium strontium zirconate titanate ceramic, which has the general formula shown in formula I: Ba (1‑x) Sr x Zr y Ti (1‑y) o 3 Formula I; in formula I, x is 0.15-0.30; y is 0.15-0.2. In the strontium barium zirconate titanate ceramics provided by the present invention, the composition fluctuation caused by random zirconium ion doping substitution makes the electric domain structure change from macro domain to micro domain, which brings a wider phase transition temperature range; After strontium ions, strontium ions adjust and maintain the domain structure of ferroelectric ceramics, which increases the proportion of macro-electric domains in the ceramic structure to a certain extent, thus weakening the phase transition effect caused by adjacent dipoles with different electric dipoles. The mutual coercion of the oriented micro-domains improves the electrical card effect indicators such as the polarization strength and the corresponding adiabatic temperature change. The invention also provides a preparation method and application of strontium barium zirconate titanate ceramic.

Description

technical field [0001] The invention relates to the technical field of ceramic materials, in particular to barium strontium zirconate titanate ceramics and a preparation method and application thereof. Background technique [0002] The traditional refrigeration method adopts air compressor refrigeration, and its refrigeration efficiency can only reach 50% of the Carnot cycle efficiency in theory, and in the actual use process, due to the dissipation of energy in various ways in the heat conduction process, the refrigeration efficiency is even difficult to achieve Reach the theoretical value of cycle efficiency. At the same time, in the process of air compressor refrigeration, the use of various refrigerants represented by fluorides causes environmental damage, such as damage to the ozone layer and the aggravation of the global warming effect, which restricts the development of air compressor refrigeration technology. Further popularize and develop. In recent years, with th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/468C04B35/622
CPCC04B35/468C04B35/622C04B2235/3213C04B2235/3244C04B2235/602C04B2235/6567C04B2235/94C04B2235/96
Inventor 鲁圣国简晓东路标姚英邦陶涛梁波
Owner GUANGDONG UNIV OF TECH