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High-performance potassium sodium niobate-based leadless piezoelectric ceramic and preparation method for same

A potassium sodium niobate-based, lead-free piezoelectric technology, applied in the field of functional ceramic materials, can solve the problems of inability to approach or achieve performance, unstable comprehensive performance, unsatisfactory material performance, etc., and achieve important practical significance and social benefits, Performance and stability, the effect of improving piezoelectric performance

Inactive Publication Date: 2012-06-27
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the potassium sodium niobate-based lead-free piezoelectric ceramics obtained by atmospheric pressure sintering are not high in performance (piezoelectric constant d 33 =80pC / N), therefore, by adjusting the ratio of potassium and sodium, or adopting hot pressing sintering or spark plasma sintering technology, the existing technology has developed to adopt technical measures such as doping modification, so that the piezoelectric constant of the ceramic material has a relatively high Great improvement, but still can not approach or reach the performance of traditional lead-based piezoelectric ceramics, so that the application is greatly limited
In addition, while the lead-free piezoelectric ceramics of the existing KNN system improves the piezoelectric performance, the dielectric constant is relatively small and the dielectric loss is high, which makes the polarization unstable and the overall performance unstable. The performance of the prepared material is still not ideal

Method used

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  • High-performance potassium sodium niobate-based leadless piezoelectric ceramic and preparation method for same
  • High-performance potassium sodium niobate-based leadless piezoelectric ceramic and preparation method for same
  • High-performance potassium sodium niobate-based leadless piezoelectric ceramic and preparation method for same

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Embodiment 1

[0031] Such as figure 1 As shown, the preparation method of high-performance potassium sodium niobate-based lead-free piezoelectric ceramics in this embodiment is as follows:

[0032] (1) Preparation of potassium sodium niobate-based lead-free piezoelectric ceramic pre-fired green body

[0033] (1-1) the carbonate of K, Na, Li, the oxide compound of Nb, Sb, Ta are weighed batching according to the parameter shown in Table 1;

[0034] (1-2) Add the prepared raw materials into a ball mill with absolute ethanol as the medium, ball mill the mixture for 14 hours, and obtain the mixed powder after drying;

[0035](1-3) Press the mixed powder into a large piece with a diameter of 20mm and a thickness of 5mm under a pressure of 10MPa, and then pre-fire it in the air at 800, 850, 900, 950, and 1000°C respectively, keep it warm for 6 hours, and Cooling obtains the sodium potassium niobate base calcined block;

[0036] (1-4) Grinding the potassium-sodium niobate-based calcined block t...

Embodiment 2

[0047] Such as figure 1 As shown, the preparation method of high-performance potassium sodium niobate-based lead-free piezoelectric ceramics in this embodiment is as follows:

[0048] (1) Preparation of potassium sodium niobate-based lead-free piezoelectric ceramic pre-fired green body

[0049] (1-1) with the carbonate of K, Na, Li, Ba, the oxide compound of Nb, Sb, Ta, Zr takes batching according to the parameter shown in Table 1;

[0050] (1-2) Add the prepared raw materials into a ball mill with absolute ethanol as the medium, ball mill the mixture for 20 hours, and obtain the mixed powder after drying;

[0051] (1-3) Press the mixed powder into a large sheet with a diameter of 30 mm and a thickness of 8 mm under a pressure of 11 MPa, and then pre-fire it in the air at 800, 850, 900, 950, and 1000 °C respectively, keep it warm for 4 hours, and then Furnace cooling obtains potassium sodium niobate base calcined block;

[0052] (1-4) Grinding the potassium-sodium niobate-b...

Embodiment 3

[0063] Such as figure 1 As shown, the preparation method of high-performance potassium sodium niobate-based lead-free piezoelectric ceramics in this embodiment is as follows:

[0064] (1) Preparation of potassium sodium niobate-based lead-free piezoelectric ceramic pre-fired green body

[0065] (1-1) with the carbonate of K, Na, Li, Ba, the oxide compound of Nb, Sb, Ta, Zr takes batching according to the parameter shown in Table 1;

[0066] (1-2) Add the prepared raw materials into a ball mill with absolute ethanol as the medium, ball mill the mixture for 18 hours, and obtain the mixed powder after drying;

[0067] (1-3) Press the mixed powder into a large sheet with a diameter of 20 mm and a thickness of 5 mm under a pressure of 14 MPa, and then pre-fire it in the air at a temperature of 900 ° C, keep it for 6 hours, and cool it with the furnace to obtain a potassium-sodium niobate-based pre-calcined burning block;

[0068] (1-4) Grinding the potassium-sodium niobate-based...

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Abstract

The invention discloses a high-performance potassium sodium niobate-based leadless piezoelectric ceramic, expressed by a general formula of (1-x)(KNa)<c>Li<d>(Nb<e>Ta<f>Sb<g>)O3 - xBaZrO3, wherein a, b, c, d, e, f and g are molar fractions, a is greater than 0.35 and not greater than 0.6, b is greater than 0.35 and not greater than 0.6, c is greater than 0.92 and not greater than 0.99, d is greater than 0 and not greater than 0.25, e is greater than 0.74 and not greater than 0.89, f is greater than 0.1 and not greater than 0.3, and g is not less than 0.01 and less than 0.3; and x represents the molar percentage of BaZrO3 for (KNa)<c>Li<d>(Nb<e>Ta<f>Sb<g>)O3, and x is not less than 0 and not greater than 30%. Additionally, a preparation method for the high-performance potassium sodium niobate-based leadless piezoelectric ceramic is further disclosed. The high-performance potassium sodium niobate-based leadless piezoelectric ceramic and the preparation method for the same disclosed by the invention remarkably improve the piezoelectric properties and dielectric properties of ceramic material, thereby obtaining dielectric material excellent and stable in performances; and the high-performance potassium sodium niobate-based leadless piezoelectric ceramic can completely replace traditional lead-based piezoelectric ceramic in application, as well as has important practical significance and social benefits.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a potassium sodium niobate-based lead-free piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramics are an important class of functional ceramics. Piezoelectric materials and devices have the function of realizing the direct conversion of electrical energy and mechanical energy. It has been widely used in ultrasonic transducers, sensors, electronic information, non-destructive testing and other technical fields. Due to the superior performance of lead-containing piezoelectric ceramics, lead-containing lead zirconate titanate-based piezoelectric ceramics have always been dominant in the prior art. However, the content of lead oxide in this type of ceramic material is usually as high as 70%, and lead is a poisonous substance. Lead poisoning can seriously affect children's intellectual development and endanger...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/622H10N30/853
Inventor 李月明肖祖贵沈宗洋王竹梅洪燕吴芬刘涛
Owner JINGDEZHEN CERAMIC INSTITUTE
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