Potassium-sodium niobate-based lead-free piezoelectric ceramic with gradient components and preparation method thereof

A potassium sodium niobate-based, lead-free piezoelectric technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, circuits, etc., can solve environmental and human problems. Health hazards, restrictions on the wide application of ceramics, poor temperature stability of piezoelectric and strain properties, etc., to meet environmental protection requirements, facilitate industrial production, and have good stability.

Active Publication Date: 2021-11-19
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with the lead-based piezoelectric ceramics currently used in the industry, the potassium sodium niobate-based lead-free piezoelectric ceramics is not only related to the composition, but also changes its structure with the change of temperature, resulting in The temperature stability of its piezoelectric and strain properties is poor, which limits the wide application of ceramics
[0006] Therefore, we hope to further improve the piezoelectric properties of potassium sodium niobate-based lead-free piezoelectric ceramics and the temperature stability of strain, so that it is expected to solve the problem of the lead element in the lead-based piezoelectric ceramics currently used on a large scale in industry. Volatilization is a problem that causes serious harm to the environment and human health

Method used

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  • Potassium-sodium niobate-based lead-free piezoelectric ceramic with gradient components and preparation method thereof
  • Potassium-sodium niobate-based lead-free piezoelectric ceramic with gradient components and preparation method thereof
  • Potassium-sodium niobate-based lead-free piezoelectric ceramic with gradient components and preparation method thereof

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preparation example Construction

[0060] figure 1 It is a schematic flow chart of the casting preparation method of composition gradient potassium sodium niobate-based lead-free piezoelectric ceramics provided by the second embodiment of the present invention. Such as figure 1 As shown, the preparation method of the sodium potassium niobate-based lead-free piezoelectric ceramics comprises the following steps:

[0061] Step S101, according to the mole percentage in the chemical composition general formula of the above-mentioned first embodiment, to analyze pure Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Bi 2 o 3 , ZrO 2 , Fe 2 o 3 As a raw material, ball milling is carried out with anhydrous ethanol as a medium to obtain a wet powder slurry.

[0062] Specifically, the pure Na will be analyzed according to the molar percentage of the general chemical composition formula 2 CO 3 、K 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Bi 2 o 3 , ZrO 2 , Fe 2 o 3 As a raw material, using absolute ethanol as a ...

Embodiment 1

[0092] The chemical composition of the piezoelectric ceramic of embodiment 1 is:

[0093] 0.99K 0.48 Na 0.52 Nb 0.955 8b 0.045 o 3 -0.01Bi 0.5 Na 0.5 ZrO 3 -0.2mol%Fe 2 o 3 , x is 0.01.

[0094] The preparation method of the piezoelectric ceramic is as follows:

[0095] (1) Take by weighing analytically pure 2.7602g Na 2 CO 3 , 3.3170g K 2 CO 3 , 12.5718g Nb 2 o 5 , 0.6494gSb 2 o 3 , 0.1165g Bi 2 o 3 , 0.1245g ZrO 2 , 0.0323g Fe 2 o 3 As raw material, carry out batching.

[0096] (2) Use absolute ethanol as the medium for the weighed raw materials, planetary ball mill for 12 hours, and then dry to obtain a uniformly mixed dry powder, and then pre-calcine the obtained dry powder at 850° C. for 6 hours.

[0097] (3) The pre-burned powder is dried with anhydrous ethanol as a medium, and then ball-milled by a planetary ball mill for 12 hours to obtain a powder.

[0098] (4) Add the above-mentioned powder to absolute ethanol and triethanolamine and perform ...

Embodiment 2

[0100] The chemical composition of the piezoelectric ceramic of embodiment 2 is:

[0101] 0.98K 0.48 Na 0.52 Nb 0.955 Sb 0.045 o 3 -0.02Bi 0.5 Na 0.5 ZrO 3 -0.2mol%Fe 2 o 3 , that is, x is 0.02.

[0102] The preparation method of the piezoelectric ceramic is the same as that of Example 1, and the similarities will not be described again. The difference is that the quality of the raw materials is weighed and prepared according to the chemical formula in Example 2 to obtain dry flakes.

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Abstract

The invention discloses a potassium-sodium niobate-based lead-free piezoelectric ceramic with gradient components and a preparation method thereof. The piezoelectric ceramic is formed by compounding a plurality of component layers, the chemical composition general formula of each component layer is (1-x) K0. 48Na0. 52Nb0. 955Sb0. 045O3-xBi0. 5Na0. 5ZrO3-0.2 mol% Fe2O3 , wherein x is the molar fraction of the component Bi0. 5Na0. 5ZrO3 and is greater than or equal to 0.01 and less than or equal to 0.04; x values among the component layers are changed in a gradient manner. The preparation method of the piezoelectric ceramic comprises the following steps: preparing sheets forming a plurality of component layers by adopting a tape casting method according to the chemical composition of the component layers, then overlapping and pressing the sheets forming the component layers into a blank body according to a gradient change mode of x values, and carrying out glue discharging and sintering on the blank body. The piezoelectric ceramic is a lead-free environment-friendly material, and has excellent temperature stability of piezoelectric property and strain property.

Description

technical field [0001] The invention relates to a composition gradient potassium sodium niobate-based lead-free piezoelectric ceramic and a preparation method thereof, belonging to the technical field of functional ceramics. Background technique [0002] Piezoelectric ceramics are special functional transformation materials that can realize mutual conversion between force and electricity. Since the piezoelectric effect was discovered by the Curie brothers, piezoelectric ceramic materials have developed significantly, especially the discovery of lead zirconate titanate ceramics, which has greatly promoted the wide application of piezoelectric ceramics in detection, sensing, medical testing, etc. each field. [0003] When a force is applied to both ends of the piezoelectric material, the internal polarization state of the material will change, so that the two ends of the material will have opposite charges, which is the positive piezoelectric effect. Conversely, the phenomen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H01L41/187H01L41/43
CPCC04B35/495C04B35/622C04B2235/75C04B2235/3255C04B2235/3248C04B2235/3201C04B2235/3298C04B2235/3272H10N30/8542H10N30/097
Inventor 吴家刚余运刚郑婷
Owner SICHUAN UNIV
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