Microwave synthesis method of potassium-sodium niobate leadless piezoelectric ceramic powder

A lead-free piezoelectric and microwave synthesis technology, applied in the field of lead-free piezoelectric ceramics, can solve the problem of high temperature synthesis easily deviating from the stoichiometric ratio, and achieve the effects of improving the chemical reaction rate, uniform heating and uniform distribution

Active Publication Date: 2016-12-21
ZHENGZHOU UNIV
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a microwave synthesis method of potassium sodium niobate lead-free piezoelectric ceramic powder, thereby solving the problem in the prior art that the high temperature synthesis of potassium sodium niobate powder easily deviates from the stoichiometric ratio

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  • Microwave synthesis method of potassium-sodium niobate leadless piezoelectric ceramic powder

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Embodiment 1

[0029] A microwave synthesis method of potassium sodium niobate lead-free piezoelectric ceramic powder, the following steps are adopted:

[0030] 1) Press (K 0.5 Na 0.5 )NbO 3 The stoichiometric ratio of raw material K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 ; The raw material, ZrO 2 Balls and absolute ethanol were added to a nylon ball mill tank at a mass ratio of 1:4:1.5 and mixed with a planetary ball mill for 6 hours; after mixed grinding, dried at 120°C for 6 hours to obtain a mixture;

[0031] 2) Microwave synthesis: Put the heat preservation device containing the mixture into the microwave resonator cavity, turn on the microwave source, adjust the microwave input power, so that the mixture is first heated at a rate of 10°C / min until the reflected power is stable; then at 10°C / min Raise the temperature to 650°C at a rate of 1 min, monitor the reflected power at the same time, adjust the input power, keep it warm for 10 minutes, and cool it down to room temperature natura...

Embodiment 2

[0033] A microwave synthesis method of potassium sodium niobate lead-free piezoelectric ceramic powder, the following steps are adopted:

[0034] 1) Press (K 0.5 Na 0.5 )NbO 3 The stoichiometric ratio of raw material K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 ; The raw material, ZrO 2 Balls and absolute ethanol were added to a nylon ball mill tank at a mass ratio of 1:4:1.5 and mixed with a planetary ball mill for 6 hours; after mixed grinding, dried at 120°C for 6 hours to obtain a mixture;

[0035]2) Microwave synthesis: Put the heat preservation device containing the mixture into the microwave resonator cavity, turn on the microwave source, adjust the input power of the microwave, so that the mixture is first heated at a rate of 15°C / min until the reflected power is stable; then at 5°C / min Raise the temperature to 700°C at a rate of 1 min, monitor the reflected power at the same time, adjust the input power, keep it warm for 20 min, and cool it down to room temperature natur...

Embodiment 3

[0037] A microwave synthesis method of potassium sodium niobate lead-free piezoelectric ceramic powder, the following steps are adopted:

[0038] 1) Press (K 0.5 Na 0.5 )NbO 3 The stoichiometric ratio of raw material K 2 CO 3 、Na 2 CO 3 and Nb 2 o 5 ; The raw material, ZrO 2 Balls and absolute ethanol were added to a nylon ball mill tank at a mass ratio of 1:4:1.5 and mixed with a planetary ball mill for 6 hours; after mixed grinding, dried at 120°C for 6 hours to obtain a mixture;

[0039] 2) Microwave synthesis: Put the heat preservation device containing the mixture into the microwave resonator cavity, turn on the microwave source, adjust the input power of the microwave, so that the mixture is first heated at a rate of 12°C / min until the reflected power is stable; then at 8°C / min Raise the temperature to 800°C at a rate of 1 minute, monitor the reflected power at the same time, adjust the input power, keep it warm for 15 minutes, and cool it down to room temperatu...

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Abstract

The invention discloses a microwave synthesis method of potassium-sodium niobate leadless piezoelectric ceramic powder. The microwave synthesis method of the potassium-sodium niobate leadless piezoelectric ceramic powder comprises the following steps of (1) mixing raw materials of K2CO3, Na2CO3 and Nb2O5 to obtain a mixed material; (2) performing microwave synthesis: starting a microwave source; regulating the input power so that the mixed materials realize temperature rise at the speed of 10 to 15DEG C/min until the reflecting power is stable; then, raising the temperature to 600 to 800 DEG C at the speed of 5 to 10 DEG C/min; performing heat insulation for 5 to 20min; cooling the materials to the room temperature; obtaining the potassium-sodium niobate leadless piezoelectric ceramic powder. The microwave synthesis method of potassium-sodium niobate leadless piezoelectric ceramic powder provided by the invention has the advantages that through raw material optimization and microwave heating temperature control, the self wave adsorption effect of the raw material powder is utilized; the low-temperature fast synthesis of the potassium-sodium niobate leadless piezoelectric ceramic powder is realized; in the process, alkali metal elements cannot be easily volatilized; the obtained powder does not have a phenomenon of deviating from the stoichiometric proportion.

Description

technical field [0001] The invention belongs to the field of lead-free piezoelectric ceramics, in particular to a microwave synthesis method of potassium sodium niobate lead-free piezoelectric ceramic powder. Background technique [0002] Piezoelectric ceramics are a class of functional materials that can convert mechanical energy to electrical energy, and are widely used in electronic industries such as medical imaging, acoustic sensors, and ultrasonic motors. At present, most of the industrial piezoelectric ceramics are lead zirconate titanate Pb(Zr,Ti)O with a Pb content of more than 60wt%. 3 , but Pb will cause harm to human life and the natural environment in the process of its preparation, use, and disposal. Lead-free has become the main direction of piezoelectric ceramics research. [0003] Potassium Sodium Niobate(K,Na)NbO 3 Lead-free piezoelectric ceramics (referred to as KNN) is an antiferroelectric NaNbO 3 and ferroelectric KNbO 3 of solid solution. This seri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B35/626
CPCC04B35/495C04B35/62605C04B2235/3201C04B2235/5454C04B2235/667
Inventor 张锐李杏瑞范冰冰邵刚赵彪
Owner ZHENGZHOU UNIV
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