Potassium sodium niobate-based piezoelectric ceramic, and preparation method and application thereof

A potassium-sodium niobate-based, piezoelectric ceramic technology, applied in the field of piezoelectric ceramics, can solve the problems of difficulty in obtaining dense sintered bodies, poor stability of the preparation process, and sensitivity to sintering temperature, etc., and achieve improved electric field-induced strain performance, good Densification and stability improvement effects

Active Publication Date: 2020-02-25
CHIZHOU UNIV
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Problems solved by technology

However, pure KNN piezoelectric ceramics have three disadvantages: one is that during the sintering process, Na 2 O and K 2 The volatilization of O makes it difficult to obtain a dense sintered body, which affects its performance; second, ceramics are sensitive to sintering temperature, and the sintering temperature range fluctuates around 20 ° C to 40 ° C, resulting in poor stability of the preparation process; third, ceramics are prone to K 4 Nb 6 o 7 Miscellaneous phases, resulting in ceramics susceptible to moisture

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  • Potassium sodium niobate-based piezoelectric ceramic, and preparation method and application thereof
  • Potassium sodium niobate-based piezoelectric ceramic, and preparation method and application thereof
  • Potassium sodium niobate-based piezoelectric ceramic, and preparation method and application thereof

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preparation example Construction

[0028] The present invention also provides a preparation method of potassium sodium niobate-based piezoelectric ceramics described in the above technical solution, comprising the following steps:

[0029] After niobium pentoxide, potassium carbonate, sodium carbonate, antimony trioxide and manganese dioxide are sequentially mixed, calcined, granulated, pressed, debinding, sintered and silver fired, the potassium sodium niobate base pressure is obtained. electric ceramics.

[0030] In the present invention, the consumption of described niobium pentoxide, salt of wormwood, sodium carbonate and antimony trioxide is preferably according to the described K of above-mentioned technical scheme 0.48 Na 0.52 Sb 0.10 Nb 0.90 -xMnO 2 Calculated by the stoichiometric ratio, the MnO 2 The mass of niobium pentoxide, potassium carbonate, sodium carbonate and antimony trioxide is preferably 0.2% to 0.8%, more preferably 0.2% to 0.4%, and more preferably 0.2%. In the present invention, u...

Embodiment 1

[0045] 1) According to K 0.48 Na 0.52 Sb 0.10 Nb 0.90 -0.2MnO 2 The stoichiometric measurement of 24.0431g niobium pentoxide, 6.7011g potassium carbonate, 5.5225g sodium carbonate and 2.9446g antimony trioxide, 0.0784g manganese dioxide, the quality of manganese dioxide accounts for niobium pentoxide, potassium carbonate, 0.2% of the sum of the mass of sodium carbonate and antimony trioxide;

[0046] 2) Dry the above-mentioned raw materials in an oven at 120°C for 5 hours, then add them to a ball mill tank in turn, use absolute ethanol as the medium, and use a mixture of zirconia balls with a particle size of 10mm, 5mm, and 3mm as the ball milling medium. The particle size is divided into 10mm, 5mm and 3mm zirconia balls with a ratio of 5:3:2, and the mass ratio of the mixed material, the mixture of zirconia balls and absolute ethanol is 1:2:2 in the ball mill tank After mixing in the medium, put it into a planetary ball mill, and mix for 12 hours at a speed of 250r / min; ...

Embodiment 2

[0067] 1) according to K 0.48 Na 0.52 Sb 0.10 Nb 0.90 -0.8MnO 2 The stoichiometric measure weighs respectively 24.0431g niobium pentoxide, 6.7011g potassium carbonate, 5.5225g sodium carbonate and 2.9446g antimony trioxide, 0.3137g manganese dioxide, and the quality of manganese dioxide accounts for niobium pentoxide, potassium carbonate, 0.8% of the sum of the mass of sodium carbonate and antimony trioxide;

[0068] 2) Dry the above-mentioned raw materials in an oven at 120°C for 5 hours, then add them to a ball mill tank in turn, use absolute ethanol as the medium, and use a mixture of zirconia balls with a particle size of 10mm, 5mm, and 3mm as the ball milling medium. The particle size is divided into 10mm, 5mm and 3mm zirconia balls with a ratio of 5:3:2, and the mass ratio of the mixed material, the mixture of zirconia balls and absolute ethanol is 1:2:2 in the ball mill tank After mixing in the medium, put it into a planetary ball mill, and mix for 12 hours at a sp...

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Abstract

The invention provides a potassium sodium niobate-based piezoelectric ceramic, and a preparation method and an application thereof, and belongs to the technical field of piezoelectric ceramics. The general formula of the potassium sodium niobate-based piezoelectric ceramic is K0.48Na0.52Sb0.10Nb0.90-xMnO2, x is greater than or equal to 0.2 and less than or equal to 0.8, and x is a mass fraction. Aspecific amount of manganese oxide added as a sintering aid effectively reduces the volatilization amounts of Na2O and K2O in the sintering process, so that the prepared potassium sodium niobate-based piezoelectric ceramic has good compactness and is not prone to damp, and the technical defect of poor compactness of potassium sodium niobate-based piezoelectric ceramics doped with the Sb element in the prior art is overcome. Results of the embodiment show that the strain of the potassium sodium niobate-based piezoelectric ceramic prepared in the invention reaches 0.15% in a 40 kV / cm electric field, and reaches 0.23% in a 70 kV / cm electric field, and the density reaches 98%.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric ceramics, and in particular relates to potassium sodium niobate-based piezoelectric ceramics and a preparation method and application thereof. Background technique [0002] Piezoelectric ceramics are a class of important functional materials that can convert mechanical energy and electrical energy into each other. They can convert external electrical energy into strain, and are widely used in the fields of sensors, drives, transducers, non-destructive testing, and communication technologies. Pb(Zr,Ti)O 3 Piezoelectric material systems have excellent electrostrain properties. However, during the routine preparation and use, a large amount of lead oxide will be volatilized, causing damage to the brain and nervous system of the operator. Therefore, lead-free piezoelectric materials barium titanate (BT), bismuth sodium titanate (BNT), and potassium sodium niobate (KNN) have gradually been paid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/638C04B35/64H01L41/187H01L41/43
CPCC04B35/495C04B35/622C04B35/638C04B35/64C04B2235/3201C04B2235/3267C04B2235/3294C04B2235/6562C04B2235/6567H10N30/8542H10N30/097
Inventor 李敏杨小红陈建兵
Owner CHIZHOU UNIV
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