Potassium sodium niobate based leadless piezoelectricity ceramic with high Qm and intermediate frequency resonator thereof

A potassium-sodium niobate-based ceramic resonator technology, which is applied to piezoelectric/electrostrictive/magnetostrictive devices, circuits, electrical components, etc., can solve the problems of no lead-free piezoelectric ceramics, very small, etc., and achieve The effect of high density and excellent resonance characteristics of ceramics

Inactive Publication Date: 2007-02-28
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Looking at the patent literature and non-patent literature in recent decades, most of them only report more on piezoelectricity, but for another important indicator that determines the application of piezoelectric ceramic materials in frequency devices—mechanical quality Factor Q m reported little
In addition, so far, there are basically no reports on the use of lead-free piezoelectric ceramics in the production of frequency devices

Method used

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  • Potassium sodium niobate based leadless piezoelectricity ceramic with high Qm and intermediate frequency resonator thereof
  • Potassium sodium niobate based leadless piezoelectricity ceramic with high Qm and intermediate frequency resonator thereof
  • Potassium sodium niobate based leadless piezoelectricity ceramic with high Qm and intermediate frequency resonator thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] According to the stoichiometric formula (Na 0.5 K 0.505 )Nb 1.01 o 3 +0.001molCuO ingredients, weighed 132.8gNa 2 CO 3 , 176.3gK 2 CO 3 , 674.3gNb 2 o 5 , 0.524g CuO, after mixing with zirconium balls for 4 hours, put it into a corundum crucible and press it properly, and place it in a muffle furnace for pre-burning. The pre-burning process is to raise the temperature from room temperature to 850°C at a rate of 3°C / min, and keep the temperature for 4h. In order to obtain a uniform and fine powder, the block after pre-burning at 850°C for 4 hours was crushed and passed through a 20-mesh sieve, and then vibrated with zirconium balls for 7 hours; Granulate 12% PVA powder and pass through a 60-mesh sieve; the granulated powder is pressed into a disc with a diameter of 23mm and a thickness of 1.2mm, and the pressure is 20MPa, and the pressure is maintained for 30s; After fully debinding, the blank is sintered at 1085°C for 2 hours. The surface of the sintered sampl...

Embodiment 2

[0041] According to the stoichiometric formula (Na 0.5 K 0.516 )Nb 1.032 o 3 +0.004molCuO ingredients, weighed 132.8gNa 2 CO 3 , 180.1gK 2 CO 3 , 688.7gNb 2 o 5 , 1.605g CuO, after mixing with zirconium balls for 4 hours, put it into a corundum crucible and press it properly, and place it in a muffle furnace for pre-burning. The pre-firing was raised from room temperature to 850°C at a rate of 3°C / min, and kept for 4 hours. In order to obtain a uniform and fine powder, the block after pre-burning at 850°C for 4 hours was crushed and passed through a 20-mesh sieve, and then vibrated with zirconium balls for 7 hours; Granulate 12% PVA powder and pass through a 60-mesh sieve; the granulated powder is pressed into a disc with a diameter of 23mm and a thickness of 1.2mm at a pressure of 20MPa and hold for 30s. After the formed green body is fully degummed, it is sintered at 1075 ° C for 2 hours; the surface of the sintered sample is smooth and smooth, and there is a crisp...

Embodiment 3

[0043] According to the stoichiometric formula (Na 0.5 K 0.522 )Nb 1.043 o 3 +0.005molCuO ingredients, weighed 132.8gNa 2 CO 3 , 182gK 2 CO 3 , 696.1gNb 2 o 5 , 2.162g CuO, after mixing with zirconium balls for 4 hours, put it into a corundum crucible and press it properly, and place it in a muffle furnace for pre-burning. The pre-firing was raised from room temperature to 850°C at a rate of 3°C / min, and kept for 4 hours. In order to obtain a uniform and fine powder, the block after pre-burning at 850°C for 4 hours was crushed and passed through a 20-mesh sieve, and then vibrated with zirconium balls for 7 hours; Granulate 12% PVA powder and pass through a 60-mesh sieve; the granulated powder is pressed into a disc with a diameter of 23mm and a thickness of 1.2mm at a pressure of 20MPa and hold for 30s. After the formed green body is fully degummed, it is sintered at 1075°C for 2 hours; the surface of the sintered ceramic sample is smooth and smooth, and there is a c...

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Abstract

The invention discloses a leadless piezo-electric ceramics and middle-frequency resonator with high-m niobate K-Na group, which is characterized by the following: the component is displayed at (NaxK1-x+delta)Nb1+zO3+wmolCuO(0<=x<=1,0<=delta<=0.1, 0<=z<=0.2,0<=w<=0.1); the central frequency is 455kHz, which is consistent with leadless piezo-electric ceramic middle-frequency resonator; the band breadth Bw is between 10kHz and 25kHz with resonant impedance Zi less than 300 omega.

Description

technical field [0001] The invention relates to a lead-free piezoelectric ceramic, in particular to a high mechanical quality factor (Q m ) lead-free piezoelectric ceramics based on sodium potassium niobate and intermediate frequency ceramic resonators made of the ceramics. Background technique [0002] Piezoelectric ceramics, ferroelectric ceramics and pyroelectric ceramics are all important functional ceramic materials, and also an important class of high-tech new materials with fierce international competition. These materials are used in information detection, conversion, processing and Storage has a wide range of applications. Piezoelectric ferroelectric ceramics are widely used in modern electronic information, communication, aerospace and other fields, such as piezoelectric ceramic filters, resonators, frequency discriminators, capacitors, piezoelectric gyroscopes, piezoelectric motors, piezoelectric micro-displacement device etc. Piezoelectric ferroelectric cerami...

Claims

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Application Information

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IPC IPC(8): C04B35/495H01L41/187H03H9/15
Inventor 朱建国陈强肖定全陈林余萍
Owner SICHUAN UNIV
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