High-piezoelectric-property and high-stability anti-reduction potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof

A potassium sodium niobate-based, lead-free piezoelectric technology, applied in the field of lead-free piezoelectric ceramic materials, can solve problems such as disadvantage, high price, and lower device cost.

Inactive Publication Date: 2020-07-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The internal electrodes in multilayer devices usually use silver-palladium electrodes, which are expensive and are not conducive to reducing the cost of the device

Method used

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  • High-piezoelectric-property and high-stability anti-reduction potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof
  • High-piezoelectric-property and high-stability anti-reduction potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof
  • High-piezoelectric-property and high-stability anti-reduction potassium-sodium niobate-based leadless piezoelectric ceramic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Example 1. Preparation of Potassium Sodium Niobate-Based Lead-Free Piezoelectric Ceramics

[0066] The composition expression of potassium sodium niobate-based lead-free piezoelectric ceramics in this embodiment is as follows:

[0067] 0.99[0.96K 0.5 Na 0.5 Nb 0.98 Ta 0.02 o 3 -0.04Bi 0.5 (Na 0.82 K 0.18 ) 0.5 ZrO 3 ]-0.01CaZrO 3 +0.3%MnCO 3 ; Prepared according to the following steps:

[0068] (1) Wet grinding, drying and firing:

[0069] To analyze pure Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 , ZrO 2 、 Bi 2 o 3 、 Ta 2 o 5 , CaCO 3 and MnCO 3 As the raw material, mix according to the above chemical formula, use absolute ethanol (about 150mL, that is, 14 times the mass of the powder) as the medium for planetary ball milling for 24 hours (300 rpm), and dry (temperature 80°C, time is 4h) and then calcined at 850°C for 5 hours;

[0070] (2) Secondary ball milling, granulation, compression molding, debinding and sintering:

[0071] The ceramic material ob...

Embodiment 2

[0077] Example 2, preparation of potassium sodium niobate based lead-free piezoelectric ceramics

[0078] The composition expression of potassium sodium niobate base lead-free piezoelectric ceramics in the present embodiment is as follows: 0.987[0.96K 0.5 Na 0.5 Nb 0.96 Ta 0.04 o 3 -0.04Bi 0.5 (Na 0.82 K 0.18 ) 0.5 ZrO 3 ]-0.013CaZrO 3 +0.4%MnO 2 Prepared according to the following steps:

[0079] To analyze pure Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 , ZrO 2 、 Bi 2 o 3 、 Ta 2 o 5 , CaCO 3 and MnO 2 Be raw material, carry out batching according to above-mentioned expression, all the other steps are with embodiment 1.

[0080] The experimental results are shown in Table 2.

[0081] Table 2 Example 2 Potassium sodium niobate-based lead-free piezoelectric ceramic properties

[0082]

[0083]

Embodiment 3

[0084] Example 3, preparation of potassium sodium niobate based lead-free piezoelectric ceramics

[0085] The composition expression of potassium sodium niobate base lead-free piezoelectric ceramics in the present embodiment is as follows: 0.985[0.96K 0.5 Na 0.5 Nb 0.99 Ta 0.01 o 3 -0.04Bi 0.5 (Na 0.82 K 0.18 ) 0.5 ZrO 3 ]-0.015CaZrO 3 +0.4% MnO, prepared according to the following steps:

[0086] To analyze pure Na 2 CO 3 、K 2 CO 3 , Nb 2 o 5 , ZrO 2 、 Bi 2 o 3 、 Ta 2 o 5 , CaCO 3 And MnO is raw material, carries out batching according to above-mentioned expression, all the other steps are with embodiment 1.

[0087] The experimental results are shown in Table 3.

[0088] Table 3 Example 3 Potassium sodium niobate-based lead-free piezoelectric ceramic properties

[0089]

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Abstract

The invention discloses a high-piezoelectric property and high-stability anti-reduction potassium-sodium niobate-based leadless piezoelectric ceramic and a preparation method thereof. The chemical formula of the piezoelectric ceramic is as follows: (1-x)[(1-y)K0.5Na0.5Nb<1-z>Ta<z>O<3-y>Bi0.5(Na0.82K0.18)0.5ZrO3]-xCaZrO<3+k%>M, wherein x, y, z and k represent molar fractions, x is greater than or equal to 0 and less than or equal to 0.03, y is greater than or equal to 0.02 and less than or equal to 0.05, z is greater than or equal to 0 and less than or equal to 0.12, k is greater than or equalto 0.2 and less than or equal to 0.6, x, y and z are not zero at the same time, and m represents a manganese compound. According to the anti-reduction potassium-sodium niobate-based leadless piezoelectric ceramic provided by the invention, the piezoelectric constant d33 reaches 275 pC/N or above, the planar electromechanical coupling coefficient kp can reach 0.50, the ceramic strain can reach 0.20% in a 50 kV/cm electric field, and the maximum inverse piezoelectric constant d33* reaches 500 pm/V (E = 25 kV/cm). Under a 35kV/cm electric field, the d33* of a sample at room temperature is equal to 460pm/V, and the temperature Te of the inverse piezoelectric coefficient d33* is stabilized within 125 DEG C within the fluctuation range of +/-10%.

Description

technical field [0001] The invention relates to a lead-free piezoelectric ceramic with high-voltage electrical performance and high stability anti-reduction potassium sodium niobate base and a preparation method thereof, belonging to the technical field of lead-free piezoelectric ceramic materials. Background technique [0002] In the piezoelectric actuator market, lead-based piezoelectric materials, such as PZT-based piezoelectric ceramics, dominate. Since lead-based materials will cause harm to human body and environment in the process of production and disposal, many countries and regions have legislated to restrict or prohibit the use of lead-based materials. This requires the development of lead-free piezoelectric materials that can replace lead-based piezoelectric materials. Although the current research on lead-free piezoelectric ceramics is progressing rapidly, there is still some gap between their piezoelectric properties and lead-based materials. In driver applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/626C04B35/638C04B41/88
CPCC04B35/495C04B35/622C04B35/62605C04B35/638C04B41/5116C04B41/88C04B2235/3201C04B2235/3208C04B2235/3244C04B2235/3251C04B2235/3262C04B2235/3298C04B2235/6562C04B2235/6567C04B41/4529
Inventor 王晓慧岑侦勇李龙土
Owner TSINGHUA UNIV
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