Potassium-sodium niobate based lead-free piezoelectric ceramic, and manufacturing process and application thereof

A potassium-sodium niobate-based, lead-free piezoelectric technology, which is applied in the direction of sound-generating devices and instruments, can solve the problems of unfavorable industrial production and automation, complicated assembly process, and virtual solder joints, so as to avoid the failure of lead solder joints , Improve the assembly structure and reduce the weight

Active Publication Date: 2019-11-15
桐乡清锋科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of structural relationship, the assembly process of fixing, welding and leading out is relatively complicated, and it is easy to cause quality problems such as virtual welding and desoldering at the solder joints, which is not conducive to the realization of mass industrial production and automation

Method used

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  • Potassium-sodium niobate based lead-free piezoelectric ceramic, and manufacturing process and application thereof
  • Potassium-sodium niobate based lead-free piezoelectric ceramic, and manufacturing process and application thereof
  • Potassium-sodium niobate based lead-free piezoelectric ceramic, and manufacturing process and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Embodiment 1: a kind of potassium sodium niobate base lead-free piezoelectric ceramics, comprises the chemical composition of following molar percentage: 92% (K 0.6 Na 0.4 )NbO 3 , 2% (Ca 0.5 Mg 0.5 )TiO 3 and 6% SrHfO 3 , the preparation method comprises the following steps:

[0026] (1) Raw material pretreatment: Put potassium carbonate, sodium carbonate, niobium pentoxide, calcium carbonate, basic magnesium carbonate, titanium dioxide, strontium carbonate and hafnium oxide into a petri dish, place in an oven, and keep warm at 180°C for 3 hours , get the preparation material;

[0027] (2) Mixed preparatory material: The preparatory material is dispersed in absolute ethanol according to the chemical composition ratio, put into a ball mill for wet milling, the speed of the ball mill is 450rpm, and the wet milling time is 45h. After the wet milling is completed, take it out and put it in the oven Dried, ground with an agate mortar, passed through an 80-mesh sieve,...

Embodiment 2

[0032] Embodiment 2: a kind of potassium sodium niobate base lead-free piezoelectric ceramics, comprises the chemical composition of following molar percentage: 91% (K 0.6 Na 0.4 )NbO 3 , 4% (Ca 0.5 Mg 0.5 )TiO 3 and 5% SrHfO 3 , the preparation method comprises the following steps:

[0033] (1) Raw material pretreatment: Put potassium carbonate, sodium carbonate, niobium pentoxide, calcium carbonate, basic magnesium carbonate, titanium dioxide, strontium carbonate and hafnium oxide into a petri dish, place in an oven, and keep warm at 200°C for 4 hours , get the preparation material;

[0034] (2) Mixed preparatory material: The preparatory material is dispersed in absolute ethanol according to the chemical composition ratio, put into a ball mill for wet milling, the speed of the ball mill is 500rpm, and the wet milling time is 46h. After the wet milling is completed, take it out and put it in the oven Dried, ground with an agate mortar, passed through a 100-mesh sieve,...

Embodiment 3

[0039] Embodiment 3: a kind of potassium sodium niobate base lead-free piezoelectric ceramics, comprises the chemical composition of following molar percentage: 90% (K 0.6 Na 0.4 )NbO 3 , 4% (Ca 0.5 Mg 0.5 )TiO 3 and 6% SrHfO 3 , the preparation method comprises the following steps:

[0040] (1) Raw material pretreatment: Put potassium carbonate, sodium carbonate, niobium pentoxide, calcium carbonate, basic magnesium carbonate, titanium dioxide, strontium carbonate and hafnium oxide into a petri dish, place in an oven, and keep warm at 220°C for 4 hours , get the preparation material;

[0041] (2) Mixed preparatory material: The preparatory material is dispersed in absolute ethanol according to the chemical composition ratio, put into a ball mill for wet milling, the speed of the ball mill is 550rpm, and the wet milling time is 50h. After the wet milling is completed, take it out and put it in the oven Dried, ground with an agate mortar, passed through a 120-mesh sieve,...

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Abstract

The invention relates to the technical field of lead-free piezoelectric ceramics, and particularly relates to potassium-sodium niobate based lead-free piezoelectric ceramic, and a manufacturing process and application thereof. The potassium-sodium niobate based lead-free piezoelectric ceramic with high density and excellent piezoelectric performance is prepared by adopting direct dry pressing molding, atmosphere sintering and control of sintering temperature. The invention also provides a novel buzzer structure, the assembly is simple, production is facilitated, and a buzzer electrode is tightly combined with a driving circuit electrode, so that stability is high.

Description

technical field [0001] The invention relates to the technical field of lead-free piezoelectric ceramics, in particular to potassium sodium niobate-based lead-free piezoelectric ceramics and its manufacturing process and application. Background technique [0002] Piezoelectric buzzer is an electroacoustic element composed of piezoelectric ceramic sounding element and oscillating circuit. It pastes high-voltage polarized piezoelectric ceramic sheet on the vibrating metal sheet. When AC voltage is added, it will, due to the piezoelectric effect, And produce mechanical deformation stretching and contraction, use this characteristic to make the metal sheet vibrate and make sound. 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 advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/495C04B41/88C04B35/64G10K9/122G10K9/20
CPCC04B35/495C04B41/88C04B41/5116C04B35/64G10K9/20G10K9/122C04B2235/3201C04B2235/3236C04B2235/3213C04B2235/3244C04B2235/6585
Inventor 龚文吴超峰
Owner 桐乡清锋科技有限公司
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