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Method for preparing potassium niobate sodium base leadless piezoelectric ceramic thin sheet and application thereof in buzzer

A potassium-sodium niobate-based, ceramic sheet technology, which is applied in the field of materials, can solve the problems of inability to prepare piezoelectric ceramic components and less research on lead-free piezoelectric ceramic materials, and achieve good electroacoustic performance, uniform crystal grains, and electrical properties. Good results

Inactive Publication Date: 2009-06-17
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still relatively few studies on the application of lead-free piezoelectric ceramic materials in devices, and how to develop their applications in devices is particularly important.
In addition, the traditional solid-state method is only suitable for the preparation of bulk materials, and cannot prepare thin piezoelectric ceramic components.

Method used

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  • Method for preparing potassium niobate sodium base leadless piezoelectric ceramic thin sheet and application thereof in buzzer
  • Method for preparing potassium niobate sodium base leadless piezoelectric ceramic thin sheet and application thereof in buzzer
  • Method for preparing potassium niobate sodium base leadless piezoelectric ceramic thin sheet and application thereof in buzzer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] To prepare the general formula as (K 0.44 Na 0.52 Li 0.04 )(Nb 0.80 Ta 0.20 )O 3 The used raw material 500g of the sodium potassium niobate-based lead-free piezoelectric ceramic sheet is an example and its preparation method is as follows:

[0042] 1. Raw material pretreatment

[0043] Raw material Na 2 CO 3 、K 2 CO 3 , Li 2 CO 3 , Nb 2 o 5 、 Ta 2 o 5 Put it into a petri dish, put the petri dish into an oven, and bake it at 200°C for 4 hours to remove the moisture adsorbed in the raw materials.

[0044] 2. Mixed raw materials

[0045] The raw material after raw material pretreatment process step 1 is processed according to general formula (K 0.44 Na 0.52 Li 0.04 )(Nb 0.80 Ta 0.20 )O 3 The proportioning ratio is weighed, batching 500g, wherein:

[0046] 99.8% pure Na 2 CO 3 65.60kg

[0047] 99% pure K 2 CO 3 72.97kg

[0048] 98% pure Li 2 CO 3 3.58kg

[0049] Nb with a purity of 99.9% 2 o 5 252.86kg

[...

Embodiment 2

[0071] To prepare the general formula as (K 0.44 Na 0.52 Li 0.04 )(Nb 0.80 Ta 0.20 )O 3 The used raw material 500g of the sodium potassium niobate-based lead-free piezoelectric ceramic sheet is an example and its preparation method is as follows:

[0072] In the process step 2 of mixing raw materials, the raw materials used and their weight proportions are the same as those in Example 1. In pulping process step 4, 75g alcohol and mass concentration are 30% polyvinyl butyral solution 225g to join in the 225g calcined powder prepared in calcining process step 3, alcohol and mass concentration are 30% polyvinyl butyral solution The mass ratio of polyvinyl butyral solution to calcined powder is 1:3:3, and other steps in this process are the same as in Example 1. In step 5 of the casting process, the slurry prepared in step 4 of the pulping process is poured on the casting machine, cast into a film with a thickness of 70 μm, and the film is cut into a size of 10 × 15 cm 2 Th...

Embodiment 3

[0074] To prepare the general formula as (K 0.44 Na 0.52 Li 0.04 )(Nb 0.80 Ta 0.20 )O 3 The used raw material 500g of the sodium potassium niobate-based lead-free piezoelectric ceramic sheet is an example and its preparation method is as follows:

[0075] In the process step 2 of mixing raw materials, the raw materials used and their weight proportions are the same as those in Example 1. In pulping process step 4, 75g alcohol and mass concentration are 375g of polyvinyl butyral solution 375g joined in the 375g calcined powder prepared in calcining process step 3, alcohol and mass concentration are 30% The mass ratio of polyvinyl butyral solution to calcined powder is 1:5:5, and other steps in this process are the same as in Example 1. In step 5 of the casting process, the slurry prepared in the step 4 of the pulping process is poured on the casting machine, and cast into a film with a thickness of 60 μm, and the film is cut into a size of 10 × 15 cm 2 The small diaphrag...

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Abstract

The invention discloses a method for preparing a sodium potassium niobate-based lead-free piezoelectric ceramic sheet expressed by a general formula (K0.44Na0.52Li0.04)(Nb0.80Ta0.20)O3, which consists of process steps of raw material pretreatment, raw material mixing, preburning, pulping, tape casting, sheet punching, binder removal, sintering, silver coating and polarization. Compared with the prior piezoelectric ceramic preparation method, the method adopts the process steps of the pulping and the tape casting to be prepared into the sodium potassium niobate-based lead-free piezoelectric ceramic sheet with a pure perovskite structure, high density, fine crystals, uniform crystal grains, and good electrical property, and the thickness of the sodium potassium niobate-based lead-free piezoelectric ceramic sheet is 0.12mm. The sodium potassium niobate-based lead-free piezoelectric ceramic sheet prepared by the method is prepared into a lead-free piezoelectric buzzer, and the lead-free piezoelectric buzzer has no environmental pollution; the acoustic pressure reaches a maximum value 86.06dB at 4.445kHz when the driving voltage is 3V, and the maximum acoustic pressure ratio is increased to between 91.91 and 95.22dB respectively when the driving voltage is 6V and 9V, thereby showing that the piezoelectric buzzer has good electroacoustic property and achieves the application requirement of an acoustic generation device.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to piezoelectric devices and electrostrictive devices. Background technique [0002] Piezoelectric ceramic buzzer is an electro-acoustic device that uses piezoelectric effect to convert electrical energy into sound energy. Compared with mechanical buzzers and electromagnetic buzzers, piezoelectric ceramic buzzers have the advantages of no noise, good reliability, low energy consumption, clear pronunciation, strong anti-electromagnetic interference, long service life, small size, and low weight. Lightweight and other advantages, it has been widely used in various electroacoustic sounding devices in industrial and agricultural production and people's daily life, such as communication products, industrial instruments, alarms, electronic toys and household appliances. The piezoelectric buzzer is composed of a piezoelectric buzzer and a cavity with a sound hole. Among the...

Claims

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Application Information

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IPC IPC(8): C04B35/495C04B35/622G10K9/18
Inventor 杨祖培常云飞
Owner SHAANXI NORMAL UNIV
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