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Method for improving quality of piezoelectric ceramic buzzing piece

A piezoelectric ceramic sheet and piezoelectric ceramic technology, which is applied to instruments, sound-producing instruments, etc., can solve the problems of poor coating quality of silver electrodes, poor density consistency, and low polarization pass rate, etc., to overcome the problems of low density and geometric size. Good, uniform effect of polarization treatment

Pending Publication Date: 2020-04-10
GUIZHOU ZHENHUA HONGYUN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the above defects in the prior art, the present invention aims to provide a method for improving the quality of the piezoelectric ceramic buzzer; when using this method to prepare a piezoelectric ceramic buzzer with high frequency accuracy (±0.2KHz), It can effectively overcome many defects such as poor density consistency of ceramic green bodies prepared by traditional methods, easy deformation, adhesion, and cracking during sintering, poor coating quality of silver electrodes, low polarization pass rate, and poor patch quality.

Method used

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  • Method for improving quality of piezoelectric ceramic buzzing piece
  • Method for improving quality of piezoelectric ceramic buzzing piece

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1, prepare the specifications of the buzzer sheet: the size of the metal sheet is Φ27mm×0.18mm, the specification of the piezoelectric ceramic sheet is Φ20mm×0.15mm, and the frequency of the buzzer sheet after the two are bonded is required to be 3.2KHz±0.5KHz.

[0028] 1) Prepare piezoelectric ceramic powder according to the conventional method:

[0029] 1.1) Primary ball milling: Pb 3 o 4 , ZrO 2 、TiO 2 , Sb 2 o 3 , Nb 2 o 5 , NiO, MgO, Li 2 CO 3 The raw material powder is mixed according to the conventional method, and then mixed with absolute ethanol and zirconium balls according to the conventional method, ball milled, dried and sieved according to the conventional method to obtain green porcelain powder;

[0030] 1.2) Pre-firing: sinter the raw porcelain powder according to the conventional method, and sieve after cooling to obtain porcelain powder;

[0031] 1.3) Secondary ball milling: the porcelain powder is mixed with absolute ethanol and zirc...

Embodiment 2

[0044] Example 2, the specifications of the buzzer sheet are prepared: the size of the metal sheet is Φ34.7mm×0.30mm, the specification of the piezoelectric ceramic sheet is Φ25mm×0.246mm, and the frequency of the buzzer sheet after the two are bonded is required to be 3.45KHz±0.5KHz.

[0045] Each step is with embodiment 1. Among them, the weight ratio of the piezoelectric ceramic powder to the polyvinyl alcohol colloid in step 2) is 100:6; the aggregate particle size in step 3) is 8 μm; the outer dimension of the green bar in step 4) is Φ29 .0mm×130mm, isostatic pressure 300Mpa; in step 6), the outer diameter of the piezoelectric ceramic rod is Φ25mm, and the thickness of the piezoelectric ceramic sheet is 0.30mm.

[0046] Randomly select 50 buzzer chips prepared in this example and 50 buzzer chips prepared by traditional technology, and test the resonant frequency, resonant impedance, capacity range and other properties. Table 2 of the test data.

[0047] Table 2: Comparis...

Embodiment 3

[0049] Example 3, prepare the buzzer sheet in Example 1.

[0050] Each step is with embodiment 1. Wherein, the weight ratio of the piezoelectric ceramic powder to the polyvinyl alcohol colloid in step 2) is 100:3; the aggregate particle size in step 3) is 5 μm; the isostatic pressure in step 4) is 200Mpa.

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Abstract

The invention discloses a method for improving the quality of a piezoelectric ceramic buzzing piece and belongs to a preparation method of the piezoelectric ceramic buzzing piece. The invention aims to provide the preparation method of the piezoelectric ceramic buzzing piece to meet the requirement of large-scale production and improve the product quality. The preparation method comprises the following steps: preparing slurry, molding a green body, sintering the green body, coating a silver electrode, and pasting: uniformly mixing piezoelectric ceramic powder and polyvinyl alcohol colloid, spraying and drying to obtain aggregates; putting the aggregates into a mold, pressing into a bar green body by adopting an isostatic pressing process, and sintering; grinding an outer circle of a piezoelectric ceramic rod body, and then cutting the piezoelectric ceramic rod body into slices; ultrasonically cleaning, drying, printing silver paste on a surface, and burning silver; and bonding a coatedsilver electrode piezoelectric ceramic sheet with the metal sheet, and performing drying and curing. The buzzing sheet prepared by the method has the advantages of small impedance, large capacity, small frequency drift amount and the like, and the method is a method for preparing the piezoelectric ceramic buzzing sheet.

Description

technical field [0001] The invention relates to a preparation method of a piezoelectric ceramic buzzer whose frequency accuracy range is within ±0.2KHz, in particular to a method for improving the quality of a piezoelectric ceramic buzzer; it belongs to a preparation method of electronic components. Background technique [0002] Piezoelectric ceramic buzzer is widely used in environmental engineering, medical equipment, automobile industry, security, Industrial alarm equipment, household appliances and military components and other fields. [0003] At present, the manufacturing process of piezoelectric ceramic buzzer is usually: batching - ball milling - calcination - secondary ball milling - green body forming (casting or rolling film to prepare film tape, stamping into thin slices) - laminated sintering - ceramic appearance Sorting - printing silver electrodes - burning silver - polarization - sorting of silver sheet appearance - metal sheet pasting. There are following ...

Claims

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Application Information

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IPC IPC(8): C04B35/622C04B35/626C04B35/634C04B41/88G10K9/122G10K9/20
CPCC04B35/622C04B35/62695C04B35/63416C04B41/88C04B41/5116G10K9/122G10K9/20C04B2235/77C04B2235/3296C04B2235/3244C04B2235/3232C04B2235/3294C04B2235/3251C04B2235/3279C04B2235/3206C04B2235/442C04B41/4539C04B41/0072
Inventor 林霖刘长流张珍宣王安玖李娅秦洁
Owner GUIZHOU ZHENHUA HONGYUN ELECTRONICS
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