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High-voltage high-curie-point potassium sodium niobate-potassium sodium antimonate series lead-free piezoelectric ceramic and preparation method thereof

A high Curie point, lead-free piezoelectric technology, applied in the field of lead-free piezoelectric ceramics, can solve the problems of narrowing the application temperature range and limiting the application range, so as to improve the structure density, improve the electrical performance and high temperature stability Effect

Active Publication Date: 2020-08-18
成都迪迈斯科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the KNN series ceramics obtained in this way have a high piezoelectric constant, the increase in the piezoelectric constant is often accompanied by a decrease in the Curie temperature, which leads to a narrower application temperature range and limits its application range.

Method used

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  • High-voltage high-curie-point potassium sodium niobate-potassium sodium antimonate series lead-free piezoelectric ceramic and preparation method thereof
  • High-voltage high-curie-point potassium sodium niobate-potassium sodium antimonate series lead-free piezoelectric ceramic and preparation method thereof
  • High-voltage high-curie-point potassium sodium niobate-potassium sodium antimonate series lead-free piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The present embodiment prepares by general formula 0.965[(1-x)K 0.54 Na 0.476 NbO 3 -xK 0.54 Na 0.476 SbO 3 ]-0.01Bi 2 o 3 -0.0025Fe 2 o 3 -0.03ZrO 2 The lead-free piezoelectric ceramic represented, x=0.01 (sample 1) in the formula, specifically comprises the following steps:

[0033] (1) Ingredients, in K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Sb 2 O is the raw material, according to the general formula K 0.54 Na 0.476 NbO 3 and K 0.54 Na 0.476 SbO 3 Chemical formula for weighing ingredients;

[0034] (2) Pre-burning, the raw materials prepared in step (1) are milled with absolute ethanol as the ball milling medium, mixed and milled for 24 hours by rolling ball milling, and then dried to obtain dry powder, and then pre-fired at about 850 ° C for about 6 hours for K 0.54 Na 0.476 NbO 3 and K 0.54 Na 0.476 SbO 3 Synthesis;

[0035] (3) Ingredients, in K 0.54 Na 0.476 NbO 3 、K 0.54 Na 0.476 SbO 3 、 Bi 2 o 3 , Fe 2 o 3 , ZrO 2 As raw materia...

Embodiment 2

[0041] The present embodiment prepares by general formula 0.965[(1-x)K 0.54 Na 0.476 NbO 3 -xK 0.54 Na 0.476 SbO 3 ]-0.01Bi 2 o 3 -0.0025Fe 2 o 3 -0.03ZrO 2 The lead-free piezoelectric ceramic represented, x=0.02 (sample 2) in the formula, specifically comprises the following steps:

[0042] (1) Ingredients, in K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Sb 2 O is the raw material, according to the general formula K 0.54 Na 0.476 NbO 3 and K 0.54 Na 0.476 SbO 3 Chemical formula for weighing ingredients;

[0043] (2) Pre-calcination, use absolute ethanol as the ball milling medium for the raw materials prepared in step (1), mix and ball mill for 24 hours by rolling ball milling method, then dry to obtain dry powder, and then pre-calcine the obtained dry powder at about 850°C for 6 hours K left and right 0.54 Na 0.476 NbO 3 and K 0.54 Na 0.476 SbO 3 Synthesis;

[0044] (3) Ingredients, in K 0.54 Na 0.476 NbO 3 、K 0.54 Na 0.476 SbO 3 、 Bi 2 o 3 , Fe 2 ...

Embodiment 3

[0050] The present embodiment prepares by general formula 0.965[(1-x)K 0.54 Na 0.476 NbO 3 -xK 0.54 Na 0.476 SbO 3 ]–0.01Bi 2 o 3 -0.0025Fe 2 o 3 -0.03ZrO 2 The lead-free piezoelectric ceramic represented, x=0.025 (sample 3) in the formula, specifically comprises the following steps:

[0051](1) Ingredients, in K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 As raw material, according to general formula K 0.54 Na 0.476 NbO 3 and K 0.54 Na 0.476 SbO 3 Chemical formula for weighing ingredients;

[0052] (2) Pre-calcination, use absolute ethanol as the ball milling medium for the raw materials prepared in step (1), mix and ball mill for 24 hours by rolling ball milling method, then dry to obtain dry powder, and then pre-calcine the obtained dry powder at about 850°C for 6 hours K left and right 0.54 Na 0.476 NbO 3 and K 0.54 Na 0.476 SbO 3 Synthesis;

[0053] (3) Ingredients, in K 0.54 Na 0.476 NbO 3 、K 0.54 Na 0.476 SbO 3 、 Bi 2 o 3 , Fe 2 o 3 ...

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Abstract

The invention discloses a high-voltage high-curie-point potassium sodium niobate-potassium sodium antimonate series lead-free piezoelectric ceramic and a preparation method thereof. The lead-free piezoelectric ceramic is represented by a general formula of 0.965[(1-x)K0.54Na0.476NbO3-xK0.54Na0.476SbO3]-0.01Bi2O3-0.0025Fe2O3-0.03ZrO2, wherein x is greater than or equal to 0.01 and less than or equal to 0.03. The high-voltage high-curie-point potassium sodium niobate-potassium sodium antimonate series lead-free piezoelectric ceramic is prepared by adopting a two-step method through a traditionalceramic preparation technology; the high-temperature-resistant piezoelectric ceramic prepared by the method has the advantages of grain size inclusion, compact microstructure, tetragonal phase content up to 70% or above, favorable piezoelectric properties, favorable temperature stability and higher Curie temperature, has wide applicability in the field of piezoelectric sensors, and can be used inthe field of high-temperature sensing.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric ceramics, and relates to the preparation of perovskite-type alkali metal niobate-based lead-free piezoelectric ceramics, in particular to a high-voltage high-curie-point potassium sodium niobate-potassium sodium antimonate system lead-free Piezoelectric ceramics and methods for their preparation. Background technique [0002] Piezoelectric ceramics have a wide range of applications in the detection, conversion and storage of information such as electricity, magnetism, light, sound, heat and force due to their excellent properties such as ferroelectricity, piezoelectricity and dielectricity, and have penetrated into national security and national economy. various fields. However, most of the piezoelectric ceramics currently on the market are lead-based piezoelectric ceramics, and the lead oxide in the raw materials is poisonous and its content is more than 60%. It will cause serious harm to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B41/88
CPCC04B35/495C04B35/622C04B41/88C04B41/5116C04B2235/3294C04B2235/3272C04B2235/3244C04B2235/3251C04B2235/3201C04B2235/3298C04B2235/656C04B2235/6567C04B2235/765C04B2235/96
Inventor 吴波
Owner 成都迪迈斯科技有限公司
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