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Preparation method of potassium-sodium niobate ceramic with high piezoelectric property and high remnant polarization strength

A polarization strength and potassium sodium niobate technology, which is applied in the field of perovskite lead-free piezoelectric ceramics, can solve the problems of low remanent polarization, low density and poor piezoelectric performance of potassium sodium niobate ceramics

Active Publication Date: 2021-03-26
AUDIOWELL ELECTRONICS GUANGDONG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by this invention is to provide a kind of potassium sodium niobate (Na0.5K0.5) NbO3 ceramic material with high piezoelectric performance and high remnant polarization for the traditional solid-phase preparation of the shortcoming in the prior art Method, the present invention solves the problems of low density, poor piezoelectric performance and small remanent polarization strength of potassium sodium niobate ceramics prepared by traditional solid phase method

Method used

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  • Preparation method of potassium-sodium niobate ceramic with high piezoelectric property and high remnant polarization strength
  • Preparation method of potassium-sodium niobate ceramic with high piezoelectric property and high remnant polarization strength
  • Preparation method of potassium-sodium niobate ceramic with high piezoelectric property and high remnant polarization strength

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Embodiment 1

[0022] A method for preparing potassium sodium niobate ceramics with high piezoelectric performance and high remnant polarization, characterized in that the specific steps are as follows:

[0023] (1) Baking materials: put alkali metal salts K2CO3 and Na2CO3 that are easy to absorb moisture in an oven at 230°C for 3 hours to dry to remove moisture;

[0024] (2) Ingredients: according to the stoichiometric ratio of (Na0.5K0.5)NbO3, weigh the raw materials K2CO3, Na2CO3, Nb2O5 successively, put the weighed raw materials into the ball mill jar, use absolute ethanol as the ball mill medium, and use 5mm in diameter and The zirconia beads with a diameter of 2mm are mixed as the ball milling beads for the initial ball milling, the mass ratio of zirconia beads with a diameter of 5mm and 2mm is 1:2, raw materials: ball milling beads: anhydrous ethanol mass ratio is 1:8:4, in a planetary ball mill Perform primary ball milling at 400rpm for 10 hours to obtain wet slurry;

[0025] (3) Br...

Embodiment 2

[0031] A method for preparing potassium sodium niobate ceramics with high piezoelectric performance and high remnant polarization, characterized in that the specific steps are as follows:

[0032] (1) Drying material: put alkali metal salts K2CO3 and Na2CO3 that are easy to absorb moisture in an oven at 200°C for 5 hours to dry to remove moisture;

[0033] (2) Ingredients: according to the stoichiometric ratio of (Na0.5K0.5)NbO3, weigh the raw materials K2CO3, Na2CO3, Nb2O5 in turn, put the weighed raw materials into the ball milling tank, use absolute ethanol as the ball milling medium, and use a 5mm diameter Zirconia beads are used as ball milling beads for the initial ball milling, raw materials: ball milling beads: dehydrated alcohol mass ratio is 1:8:4, and the initial ball milling is carried out at 400rpm in a planetary ball mill for 10h to obtain a wet slurry;

[0034] (3) Briquette pre-firing: Put the obtained slurry into a 60°C oven for 9 hours to dry to obtain a dry ...

Embodiment 3

[0040] A method for preparing potassium sodium niobate ceramics with high piezoelectric performance and high remnant polarization, characterized in that the specific steps are as follows:

[0041] (1) Baking materials: put alkali metal salts K2CO3 and Na2CO3 that are easy to absorb moisture in an oven at 250°C for 2 hours to dry to remove moisture;

[0042] (2) Ingredients: according to the stoichiometric ratio of (Na0.5K0.5)NbO3, weigh the raw materials K2CO3, Na2CO3, and Nb2O5 in sequence, put the weighed raw materials into a ball mill tank, use absolute ethanol as the ball mill medium, with a diameter of 10mm and a diameter of 5mm agate beads are mixed as the ball milling beads of the first ball milling, the mass ratio of diameter 10mm and diameter 5mm agate beads is 1: 2, raw material: ball milling beads: absolute ethanol mass ratio is 1: 8: 4, in planetary ball mill with 400rpm rotating speed is carried out initial ball milling 10h, obtains wet process slurry;

[0043] (...

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Abstract

The invention discloses a potassium-sodium niobate ceramic with high piezoelectric property and high remnant polarization strength and a preparation method of the potassium-sodium niobate ceramic. Thegeneral chemical formula of the lead-free piezoelectric ceramic is (Na0.5K0.5)NbO3. The potassium-sodium niobate leadless piezoelectric ceramic prepared by a solid-phase method has a high piezoelectric constant d33, a high planar electromechanical coupling coefficient Kp and high microcosmic density, the piezoelectric constant of the ceramic can reach 124 pC / N, and the relative density of the ceramic can reach 95.5% by using a ball-milling bead mixed ball-milling mode of zirconium oxide balls of 5 mm and 2 mm (the mass ratio is 1: 2). Meanwhile, the remnant polarization intensity of the ceramic is 23 mu C / cm<2> and is higher than that of ceramic (10-15 mu C / cm<2>) prepared by a traditional solid-phase method reported in literature. The method has important guiding significance for preparing the high-performance lead-free potassium-sodium niobate-based piezoelectric ceramic by utilizing a traditional solid-phase method.

Description

technical field [0001] The invention belongs to the technical field of perovskite-type lead-free piezoelectric ceramics, and in particular relates to a preparation method of potassium sodium niobate ceramics with high voltage electrical properties and high remnant polarization strength. Background technique [0002] Because piezoelectric ceramics can realize the mutual conversion function of mechanical energy and electric energy, and are convenient for manufacturing various functional components with low loss, high reliability, and miniaturization, they are widely used in various fields of national daily production and life, such as Transducers, sensors, drives, etc. At present, the mainstream material of piezoelectric ceramic devices on the market is lead-based lead zirconate titanate (PZT) material. The heavy metal element lead contained in this lead-based material is extremely harmful to many organisms and the environment including humans. Many countries have introduced ...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622C04B41/88
CPCC04B35/495C04B35/622C04B41/009C04B41/5116C04B41/88C04B2235/3201C04B2235/5427C04B2235/602C04B2235/656C04B2235/6567
Inventor 高大强张曙光廖忠新
Owner AUDIOWELL ELECTRONICS GUANGDONG
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