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Low-temperature sintered potassium sodium niobate lead-free piezoelectric ceramic and preparation method thereof

A potassium sodium niobate, lead-free piezoelectric technology, applied in piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problem of potassium sodium niobate-based lead-free piezoelectric ceramics. and other problems, to achieve the effect of controllable stoichiometric ratio, small fluctuation of chemical composition and excellent performance

Inactive Publication Date: 2011-05-25
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no report on the preparation of potassium sodium niobate-based lead-free piezoelectric ceramics by adding melt and sintering at low temperature in this system

Method used

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  • Low-temperature sintered potassium sodium niobate lead-free piezoelectric ceramic and preparation method thereof
  • Low-temperature sintered potassium sodium niobate lead-free piezoelectric ceramic and preparation method thereof
  • Low-temperature sintered potassium sodium niobate lead-free piezoelectric ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of potassium sodium niobate lead-free piezoelectric ceramics of the present embodiment is as follows:

[0034] (1) Preparation of frit

[0035] According to the composition of the frit shown in Table 2, mix the ingredients evenly, melt at 1100°C, keep warm for 20 minutes, and ball mill for 6 hours with water as the medium after quenching, and dry to obtain the frit;

[0036] (2) Preparation of potassium sodium niobate lead-free piezoelectric ceramic pre-fired green body

[0037] (2-1) The carbonate of K, Na, the oxide compound of Nb are weighed batching according to the parameter shown in Table 1;

[0038](2-2) Add the prepared raw materials into a ball mill with absolute ethanol as the medium, ball mill the mixture for 8 hours, and obtain the mixed powder after drying;

[0039] (2-3) Pre-fire the mixed powder in the air at 800, 850, 900, 950, and 1000°C respectively, keep it warm for 4 hours, and cool with the furnace to synthesize potassium so...

Embodiment 2

[0047] The preparation method of potassium sodium niobate lead-free piezoelectric ceramics of the present embodiment is as follows:

[0048] (1) Preparation of frit

[0049] According to the composition of the frit shown in Table 2, mix the ingredients evenly, melt at 1000°C, keep the temperature for 30 minutes, and ball mill for 10 hours with water as the medium after quenching, and dry to obtain the frit;

[0050] (2) Preparation of potassium sodium niobate lead-free piezoelectric ceramic pre-fired green body

[0051] (2-1) The carbonate of K, Na, the oxide compound of Nb are weighed batching according to the parameter shown in Table 1;

[0052] (2-2) Add the prepared raw materials into a ball mill with absolute ethanol as the medium, ball mill the mixture for 12 hours, and obtain the mixed powder after drying;

[0053] (2-3) Pre-fire the mixed powder in the air at 800°C, keep it warm for 3 hours, and cool with the furnace to synthesize potassium sodium niobate powder;

...

Embodiment 3

[0058] The preparation method of potassium sodium niobate lead-free piezoelectric ceramics of the present embodiment is as follows:

[0059] (1) Preparation of frit

[0060] According to the composition of the frit shown in Table 2, mix the ingredients evenly, melt at 1200°C, keep the temperature for 60 minutes, and ball mill with water for 14 hours after quenching, and dry to obtain the frit;

[0061] (2) Preparation of potassium sodium niobate lead-free piezoelectric ceramic pre-fired green body

[0062] (2-1) The carbonate of K, Na, the oxide compound of Nb are weighed batching according to the parameter shown in Table 1;

[0063] (2-2) Add the prepared raw materials into a ball mill with absolute ethanol as the medium, ball mill the mixture for 16 hours, and obtain the mixed powder after drying;

[0064] (2-3) Pre-fire the mixed powder in the air at a temperature of 850° C., keep it warm for 5 hours, and cool with the furnace to synthesize potassium sodium niobate powder...

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Abstract

The invention discloses a low-temperature sintered potassium sodium niobate lead-free piezoelectric ceramic, which is expressed by a low-temperature clinker of a general formula KaNabNbO3-x, wherein a and b express molar fractions of elements respectively, the a is more than or equal to 0.3 and less than or equal to 0.7, and the b is more than or equal to 0.3 and less than or equal to 0.7; x expresses weight percentage of the low-temperature clinker in the KaNabNbO3, and x is more than 0 and less than or equal to 15 percent; and the low-temperature clinker consists of one or more of Li2O, Na2O, K2O, B2O3, SiO2, CaO, BaO, ZnO, CuO, MnO2 and MgO. The invention also discloses a preparation method for the potassium sodium niobate lead-free piezoelectric ceramic. Low-temperature sintering is realized by adding the clinker, the firing temperature range is enlarged at the same time of effectively reducing the sintering temperature of potassium sodium niobate, the stoichiometric ratio is controllable, the chemical component fluctuation is low, and a piezoelectric material with excellent and stable performance is obtained.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a low-temperature sintered sodium potassium niobate 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 devel...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622H01L41/187
Inventor 李月明沈宗洋李润润廖润华王竹梅洪燕
Owner JINGDEZHEN CERAMIC INSTITUTE
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