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PZT-based high-Curie-temperature piezoelectric ceramic and preparation method thereof

A piezoelectric ceramic, lead tetroxide technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, etc., can solve the problems of loss of piezoelectric performance, reduction of gasoline consumption rate, degradation of piezoelectric ceramic performance, etc. The comprehensive electrical performance is good, the Curie temperature is increased, and the Curie temperature is high.

Pending Publication Date: 2020-11-03
THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, at present, the injectors in advanced automotive EFI systems generally use piezoelectric injectors. Compared with traditional mechanical carburetors, electronically controlled gasoline injection systems can increase the power of automobile engines by 5% to 10%. The consumption rate is reduced by 5% to 10%, and the exhaust gas emission is reduced by 20%. The piezoelectric ceramic drivers in the piezoelectric injectors in the market mostly use conventional PZT piezoelectric ceramics, and their safe use temperature is only below 150°C. The service temperature of ceramics exceeds 1 / 2Tc, which will cause serious depolarization of piezoelectric ceramics, resulting in the deterioration of piezoelectric ceramic performance or even loss of piezoelectric performance;

Method used

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  • PZT-based high-Curie-temperature piezoelectric ceramic and preparation method thereof
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  • PZT-based high-Curie-temperature piezoelectric ceramic and preparation method thereof

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preparation example Construction

[0026] The invention discloses a preparation method of a PZT-based high Curie temperature piezoelectric ceramic, which comprises the following preparation steps:

[0027] 1) LiNb0 3 Synthesis: Baking lithium carbonate and niobium pentoxide at a temperature of 120-130°C for 12 hours, then dry mixing and ball milling, and keeping the uniformly mixed materials at a temperature of 1000-1100°C for 4 hours to synthesize LiNb0 3 ;

[0028] 2) Mixing: the synthesized LiNb0 3 , three lead tetroxide, zirconium dioxide and titanium dioxide were added to the drum mill for wet mixing for 18 hours, and the slurry was produced after fully mixing;

[0029] 3) Pre-firing: Dry the mixed slurry, put it in an alumina crucible after briquetting, and then carry out pre-firing synthesis in a tunnel-type pusher kiln.

[0030] 4) Granulation: crush the pre-burned material, and then place it in a stirring mill for fine grinding. When stirring, the weight ratio of raw materials: zirconium balls: pure...

Embodiment 1

[0037] 1) LiNb0 3 Synthesis: Baking 0.10 parts by weight of lithium carbonate and 2.11 parts by weight of niobium pentoxide at a temperature of 120-130°C for 12 hours, then dry mixing and ball milling, and keeping the uniformly mixed materials at a temperature of 1000-1100°C for 4 hours. Synthesis of LiNb0 3 ;

[0038] 2) Mixing: the synthesized LiNb0 3 , 100 parts by weight of PbO4, 27.54 parts by weight of zirconium dioxide, and 16.26 parts by weight of titanium dioxide were added to the drum mill for wet mixing for 18 hours, fully mixed and then discharged;

[0039] 3) Pre-firing: Dry the mixed slurry, put it in an alumina crucible after briquetting, and then carry out pre-firing synthesis in a tunnel-type pusher kiln.

[0040] 4) Granulation: Pulverize the pre-burned material block, then place it in a stirring mill for fine grinding, and mix according to the weight ratio of raw materials:

[0041] Zirconium balls: pure water = 1:2:0.7 ratio, after stirring for 3 hours,...

Embodiment 2

[0051] 1) LiNb0 3 Synthesis: Baking 0.12 parts by weight of lithium carbonate and 2.33 parts by weight of niobium pentoxide at a temperature of 120-130°C for 12 hours, then dry mixing and ball milling, and keeping the uniformly mixed materials at a temperature of 1000-1100°C for 4 hours. Synthesis of LiNb0 3 ;

[0052] 2) Mixing: the synthesized LiNb0 3 100 parts by weight of trilead tetraoxide, 27.27 parts by weight of zirconium dioxide, 16.26 parts by weight of titanium dioxide, and 0.01 parts by weight of antimony trioxide were added to the drum mill for wet mixing for 18 hours, and the pulp was discharged after fully mixing;

[0053] Steps 3)-9) are the same as in Example 1.

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Abstract

The invention discloses a PZT-based high-Curie-temperature piezoelectric ceramic and a preparation method thereof. The PZT-based high-Curie-temperature piezoelectric ceramic is prepared from the following raw materials in parts by weight: 100 parts of lead tetroxide, 26-28 parts of zirconium dioxide, 15-17 parts of titanium dioxide, 2.0-4.0 parts of niobium pentoxide and 0.1-0.2 part of lithium carbonate. The preparation method comprises the steps of LiNb03 synthesis, mixing, presintering, granulation, molding and plastic removal, sintering, electrode loading, polarization and measurement. Byintroducing a high Curie temperature component LiNb03 into the PZT, the Curie temperature Tc of the PZT-based piezoelectric ceramic is further increased, and the application of the piezoelectric ceramic in an extreme environment is expanded.

Description

technical field [0001] The invention relates to piezoelectric ceramics, mainly a PZT-based high Curie temperature piezoelectric ceramic and a preparation method thereof, which are mainly used in petroleum well logging and piezoelectric ceramic drivers for automobiles, etc., and belong to the technical field of electronic component manufacturing. Background technique [0002] PZT piezoelectric ceramics are made of ferroelectric PbTi0 3 with antiferroelectric PbZr0 3 Due to the excellent piezoelectric and dielectric properties of the formed continuous solid solution, PZT piezoelectric ceramics have always occupied the main application market of piezoelectric ceramics and become the most popular commercial piezoelectric ceramics; however, the Curie temperature Tc of PZT piezoelectric ceramics is generally higher than Low (150-360°C), which limits its application in high-temperature environments. [0003] In recent years, with the further expansion of the application range of ...

Claims

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Application Information

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IPC IPC(8): C04B35/491C04B35/622C04B35/626H01L41/29
CPCC04B35/491C04B35/622C04B35/6261C04B2235/3203C04B2235/3255C04B2235/3294C04B2235/656C04B2235/6567H10N30/06
Inventor 盖学周李伟吴凡
Owner THE 715TH RES INST OF CHINA SHIPBUILDING IND CORP
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