A lead-free piezoelectric ceramic, atomizing sheet and preparation method

Abstract

The present invention provides a lead-free piezoelectric ceramic, an atomized sheet and a preparation method. By replacing Fe ions with trace Mn ions, the triangular distortion of the material can be significantly improved, the symmetry of the material can be reduced, and the intrinsic properties of the piezoelectric performance can be improved. Contribution, and then significantly improve the macroscopic piezoelectric properties of the material. Therefore, the lead-free piezoelectric ceramics prepared for the atomizer can effectively avoid the lead pollution problem caused by the PZT piezoelectric ceramic materials in the process of production, service and disposal, and avoid the harm to humans and the environment; due to BF ‑BT has a high Curie temperature, the atomized sheet made of it has good resistance to dry burning, and has good anti-aging properties, and there is no problem of hydrolysis, and it can work well in water-based solutions. The characteristics of wide phase boundary and stable performance are conducive to ensuring product consistency in mass production, improving yield and reducing costs. Compared with the atomized sheet made of KNN ceramics, it has obvious advantages.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric ceramic atomizing sheets, and in particular relates to a lead-free piezoelectric ceramic, an atomizing sheet and a preparation method. Background technique [0002] As a liquid atomization device, piezoelectric ceramic atomizer is widely used in daily life, medical treatment, industrial production, scientific research and other fields. Piezoelectric ceramic atomizers can be divided into disc type and microporous type. Microporous atomizers are favored by consumers because of their advantages such as controllable atomization particle size, small driving power, and portability. The microporous atomizer is mainly composed of a piezoelectric ceramic ring and a metal diaphragm with tapered micropores. Driven by the corresponding driving power, the vibration of the piezoelectric ceramic drives the micropore group to vibrate up and down, breaking up the liquid and spraying it out from the micropor...

AI Technical Summary

Problems solved by technology

[0003] At present, the mainstream piezoelectric ceramics for manufacturing atomizers on the market are lead-containing Pb(Zr,Ti)O 3 (PZT) piezoelectric ceramics, lead-containing PZT piezoelectric ceramics will produce a large amount of dust and lead-containing waste during the manufacturing process. Once handled carelessly, they will easily flow into the environment and cause great harm to the environment.

In addition, because the liquid droplets atomized by many atomizing devices will be directly inhaled by people, such as humidifiers, medical nebulizers, etc., lead-containing PZT ceramics will inevitably dissolve certain lead ions during the working process. If people inhale for a long time , will leave a great hidden danger to human health

In addition, due to the absence of a mature recovery mechanism for lead-containing electronic devices, most atomizers are discarded directly after being discarded, and the lead in them will inevitably enter the soil, which will cause great pollution to the ecological environment

[0004] In order to solve the above problems, a large number of researchers and enterprises have proposed to use lead-free piezoelectric ceramics to prepare atomized sheets to replace traditional PZT atomized sheets, such as potassium sodium niobate (KNN) piezoelectric ceramics to prepare atomized sheets, but due to the existence of KNN itself Deliquescence, poor mass production consistency, and performance attenuation have not yet been well applied in the market

Images