A preparation method of potassium sodium niobate ceramic with high piezoelectric performance 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: 2021-10-26
AUDIOWELL ELECTRONICS GUANGDONG +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • A preparation method of potassium sodium niobate ceramic with high piezoelectric performance and high remnant polarization strength
  • A preparation method of potassium sodium niobate ceramic with high piezoelectric performance and high remnant polarization strength
  • A preparation method of potassium sodium niobate ceramic with high piezoelectric performance 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 material: put the alkali metal salts K2CO3 and Na2CO3 which 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, the raw materials K2CO3, Na2CO3, Nb2O5 are weighed successively, and the raw materials are put into a ball mill jar, and absolute ethanol is used as the ball mill medium, with a diameter of 5mm and The zirconia beads with a diameter of 2 mm are mixed as the ball milling beads for the initial ball milling. The mass ratio of zirconia beads with a diameter of 5 mm and a diameter of 2 mm is 1:2. Raw materials: ball milling beads: anhydrous ethanol with a mass ratio of 1:8:4, in a planetary ball mill Perform primary ball milling at 400rpm for 10 hours...

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) Baking materials: 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 sequence, 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...

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) Drying material: 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, Nb2O5 in sequence, put the weighed raw materials into a ball mill jar, use absolute ethanol as the ball mill medium, with a diameter of 10 mm 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] (3) ...

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Abstract

The invention discloses a potassium sodium niobate ceramic with high voltage electric performance and high residual polarization strength and a preparation method thereof. The general chemical formula of the lead-free piezoelectric ceramic is: (Na0.5K0.5)NbO3. The present invention utilizes a kind of 5mm and 2mm zirconia balls (mass ratio is 1: 2) ball milling bead mixed ball milling method, and the lead-free piezoelectric ceramics of sodium potassium niobate prepared by solid phase method has higher piezoelectric constant d33, plane Electromechanical coupling coefficient Kp and microscopic density, the piezoelectric constant can reach 124pC / N, and the relative density can reach 95.5%. At the same time, the remanent polarization strength of the ceramic is 23μC / cm2, which is higher than that reported in the literature by using the traditional solid-state method to prepare ceramics (10-15μC / cm2). The invention has important guiding significance for the preparation of high-performance lead-free potassium sodium niobate-based piezoelectric ceramics by using the traditional solid-state 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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Patent Type & Authority Patents(China)
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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