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A potassium sodium niobate-based piezoelectric ceramic and its preparation method and application

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

Active Publication Date: 2022-05-27
CHIZHOU UNIV
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  • Abstract
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  • Claims
  • Application Information

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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

Method used

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  • A potassium sodium niobate-based piezoelectric ceramic and its preparation method and application
  • A potassium sodium niobate-based piezoelectric ceramic and its preparation method and application
  • A potassium sodium niobate-based piezoelectric ceramic and its preparation method and application

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[0028] The present invention also provides a method for preparing potassium sodium niobate based piezoelectric ceramics according to the above technical solution, comprising the following steps:

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

[0030] In the present invention, the consumption of the niobium pentoxide, potassium carbonate, sodium carbonate and antimony trioxide is preferably K according to the above technical scheme. 0.48 Na 0.52 Sb 0.10 Nb 0.90 -xMnO 2 calculation of the stoichiometric ratio of the MnO 2 The mass of niobium pentoxide, potassium carbonate, sodium carbonate and antimony trioxide is preferably 0.2%-0.8%, more preferably 0.2%-0.4%, more preferably 0.2%. In the present invention, unless otherwise specified, th...

Embodiment 1

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

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

[0047] 3) ...

Embodiment 2

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

[0068] 2) After drying the above-mentioned raw materials in an oven at 120° C. for 5 hours, add them to a ball milling jar in turn, use absolute ethanol as a medium, and use a mixture of zirconia balls with particle diameters of 10 mm, 5 mm and 3 mm as the ball milling grinding medium, The dosage ratio of zirconia balls with particle sizes of 10mm, 5mm and 3mm is 5:3:2, and the mass ratio of the mixture, the mixture of zirconia balls and absolute ethanol is 1:2:2 in the ball mill jar. After mixing, put it into a planetary ball mill, and mix for 12h at a speed of 250r / min;

[0069] 3) ...

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Abstract

The invention provides potassium sodium niobate-based piezoelectric ceramics and a preparation method and application thereof, which belong to the technical field of piezoelectric ceramics. The potassium sodium niobate-based piezoelectric ceramic provided by the invention has a general formula of K 0.48 Na 0.52 Sb 0.10 Nb 0.90 -xMnO 2 , 0.2≤x≤0.8, x is the mass fraction. The present invention effectively reduces Na by adding a specific amount of manganese oxide as a sintering aid 2 O and K 2 The volatilization of O in the sintering process makes the prepared potassium-sodium niobate-based piezoelectric ceramics have good compactness and is not easy to be affected by moisture. The technical defect of poor compactness of ceramics. The results of the examples show that the potassium sodium niobate-based piezoelectric ceramic prepared by the present invention has a strain of 0.15% under an electric field of 40kV / cm, and a strain of 0.23% under an electric field of 70kV / cm, and a density of 98%.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/495C04B35/622C04B35/638C04B35/64H01L41/187H01L41/43H10N30/097H10N30/853
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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