Potassium niobium antimonate lead-free piezoelectric ceramics and preparation method thereof

A potassium sodium niobate antimonate, lead-free piezoelectric technology, applied in ceramics, inorganic insulators and other directions, can solve the problem that the piezoelectric performance needs to be further improved, and achieve the effect of promoting the practical process, mature technology and easy realization.

Active Publication Date: 2019-03-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a large gap between the piezoelectric coefficients of KNN series ceramics obtained by using these two ideas and the traditional ceramic preparation process compared with lead-based piezoelectric ceramics, and the piezoelectric coefficient d 33 There are few reports of more than 400pC / N, and the piezoelectric performance needs to be further improved

Method used

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  • Potassium niobium antimonate lead-free piezoelectric ceramics and preparation method thereof
  • Potassium niobium antimonate lead-free piezoelectric ceramics and preparation method thereof
  • Potassium niobium antimonate lead-free piezoelectric ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Prepared by general formula (1-x) K 0.5 Na 0.5 NbO 3 -x(Bi 0.45 SM 0.05 Na 0.5 )ZrO 3 Expressed lead-free piezoelectric ceramics, where x = 0.000, 0.020, 0.030, 0.040, 0.045, 0.050, 0.055, 0.060, 0.070.

[0047] Preparation:

[0048] to analytically pure K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 、 Bi 2 o 3 、Sm 2 o 3 , ZrO 2 As the raw material, weigh the ingredients according to the chemical formula of the corresponding formula, use absolute ethanol as the ball milling medium for the prepared raw materials, mix and mill for 24 hours by rolling ball milling method, and then dry to obtain dry powder; keep the obtained dry powder at 850°C for 6 hours Carry out the synthesis of niobate compound by calcining, and obtain calcined powder after cooling to room temperature; add polyvinyl alcohol aqueous solution with a concentration of 7% to the obtained calcined powder for granulation to obtain pellets; A 10mm mold is pressed under a pressure of 10MPa to form a ceramic g...

Embodiment 2

[0054] Prepared by general formula (1-x) K 0.4 Na 0.6 Nb 0.96 Sb 0.04 o 3 -x(Bi 0.45 SM 0.05 Na 0.5 )ZrO 3 Represented lead-free piezoelectric ceramics, where x = 0.000, 0.020, 0.030, 0.035, 0.040, 0.045, 0.050, 0.060.

[0055] Preparation Process:

[0056] to analytically pure K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Bi 2 o 3 、Sm 2 o 3 , ZrO 2 As the raw material, according to the corresponding chemical formula, the prepared raw materials are mixed with absolute ethanol as the ball milling medium, mixed and milled for 24 hours by rolling ball milling method, and then dried to obtain dry powder; Synthesis of acid salt compound, after cooling to room temperature, calcined powder is obtained; 7% polyvinyl alcohol aqueous solution is added to the obtained calcined powder for granulation to obtain pellets; the obtained pellets are molded with a diameter of 10mm Under the pressure of 10MPa, press into a ceramic green sheet with a thickness of about 0.8-1.0m...

Embodiment 3

[0061] Prepared by the general formula 0.96K 1-y Na y Nb 0.96 Sb 0.04 o 3 -0.04 (Bi 0.45 SM 0.05 Na 0.5 )ZrO 3 Represented lead-free piezoelectric ceramics, where y = 0.4, 0.44, 0.48, 0.52, 0.56, 0.60, 0.64, 0.68.

[0062] Preparation Process:

[0063] to analytically pure K 2 CO 3 、Na 2 CO 3 , Nb 2 o 5 , Sb 2 o 3 、 Bi 2 o 3 、Sm 2 o 3 , ZrO 2 As the raw material, the ingredients are weighed according to the chemical formula of the corresponding formula. The prepared raw materials are milled with absolute ethanol as the ball milling medium, mixed and milled for 24 hours by rolling ball milling method, and then dried to obtain dry powder; the obtained dry powder is pre-calcined at 850°C for 6 hours to synthesize the niobate compound, and cooled to room temperature Obtain calcined powder at last; Add the polyvinyl alcohol aqueous solution that concentration is 7% to granulate to obtain pellet in the obtained calcined powder; With the mold that gained pellet ...

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Abstract

Antimony potassium-sodium niobate leadless piezoelectric ceramics provided by the invention is a compound with its chemical formula expressed as (1-x)K1-yNayNb1-zSbzO3-x(Bi0.5-uMu)R0.5ZrO3 or (1-x)K1-yNayNb1-zSbzO3-x(Bi0.5-uMu)R0.5ZrO3-aQ, wherein x is less than or equal to 0.08 and greater than or equal to 0; y is less than or equal to 0.68 and greater than or equal to 0.4; z is less than or equal to 0.04 and greater than or equal to 0; u is less than or equal to 0.05 and greater than or equal to 0.04; M element is one of lanthanide Sm, Nd and La; R element is at least one of Na, K, Li and Ag; Q is a metallic oxide; a is molar percentage of the metallic oxide Q in the compound (1-x)K1-yNayNb1-zSbzO3-x(Bi0.5-uMu)R0.5ZrO3; and the metallic oxide Q is one of Zn oxide, Cu oxide and Mn oxide. The antimony potassium-sodium niobate leadless piezoelectric ceramics can further raise and enhance piezoelectric property of potassium-sodium niobate (KNN) leadless piezoelectric ceramics.

Description

technical field [0001] The invention belongs to the field of alkali metal niobate-based lead-free piezoelectric ceramics, in particular to potassium-sodium niobate-based lead-free piezoelectric ceramics and a preparation method thereof. Background technique [0002] The piezoelectric effect is an electromechanical coupling effect that can realize mutual conversion between mechanical energy and electrical energy. Piezoelectric materials with piezoelectric effect have been widely used in technical fields such as information, optoelectronics, precision control, and nondestructive testing, including piezoelectric resonators, piezoelectric buzzers, piezoelectric filters, piezoelectric transformers, and piezoelectric speakers. , piezoelectric igniter and piezoelectric motor, etc. The application of piezoelectric materials not only provides help and convenience for human's daily production and life, but also widely involves high-tech fields such as national security and defense. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/12C04B35/453C04B35/622C04B41/88
CPCC04B35/495C04B2235/3201C04B2235/3203C04B2235/3224C04B2235/3227C04B2235/3244C04B2235/3291C04B2235/3294C04B2235/3298C04B2235/725
Inventor 肖定全马健吴波吴家刚朱建国余萍
Owner SICHUAN UNIV
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