Formula and preparation method of high-curie-point low-temperature co-fired piezoelectric ceramic

Abstract

The invention belongs to the technical field of piezoelectric ceramic pieces, in particular to a high-curie-point low-temperature co-fired piezoelectric ceramic formula and a preparation method. The ceramic comprises a main component and a sintering aid component, the composition formula of the main component is PbaCa1-a[(Mn1 / 3Sb2 / 3)x(Zn1 / 3Nb2 / 3)y(Zr0. 5Ti0. 5)z]O3+bwt%Ba(Mg1 / 2W1 / 2)O3+cwt%LiNbO3,wherein a is equal to 0.02 to 0.05; x=0.01-0.06, y=0.1-0.4, z=0.89-0.54, b=0.1-0.25 and c=0.1-0.2; the sintering aid component comprises glass-phase barium magnesium tungstate accounting for 0.1 wt%-0.25 wt% of the mass of the main component, and lithium niobate accounting for 0.1 wt%-0.2 wt% of the mass of the main component; on the basis of a main component PMS-PZN-PZT (antimony-manganese-niobium-zinc-lead zirconate titanate), the perovskite-structure glass phase barium tungstate and magnesium oxide (Ba(Mg1 / 2W1 / 2)O3) and lithium niobate (LiNbO3) are doped, so that the piezoelectric ceramic with the sintering temperature lower than 900 DEG C, good piezoelectric property, high electromechanical coupling coefficient, high Curie temperature and large dielectric constant is obtained; the piezoelectric ceramic has the advantage of adjustable hardness, and the application range is expanded.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric ceramic sheets, and in particular relates to a high-Curie-point low-temperature co-fired piezoelectric ceramic formula and a preparation method. Background technique [0002] The sintering temperature of traditional lead-based piezoelectric ceramics is relatively high, generally 1200-1300°C, which will cause serious volatilization of PbO during high-temperature sintering. The volatilization of PbO will not only cause the stoichiometric ratio of the ceramic to deviate from the original design formula, but also affect the environment. Causes pollution and endangers human health. At the same time, with the development of the Internet of Things, artificial intelligence, and 5G networks, piezoelectric ceramics have gradually shifted from bulk preparation processes to sheet, multi-layer, thick film, and thin film directions. Benchmarking companies in the piezoelectric industry abroad, such as PI, ...

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Problems solved by technology

[0005] Some domestic research institutes have reported formulations below 900°C, mainly for the modification and doping of CuO / LiCO3 / SiO2 for the main body PZN-PNN-PZT (Niobium Zinc-Niobium Nickel-Lead Zirconate Titanate). Adding more sintering aids, the piezoelectric performance is not ideal. At the same time, because the Curie temperature of PZN and PNN system is relatively low, which are 190°C and 130°C respectively, the Curie point of the overall formula is low, which affects the The use of products in high temperature environment

In order to increase the local temperature, some research institutions choose BiScO3-PbTiO3 as the main body or PbTiO3 as the main formula, and modify it on this basis to obtain a formula with a high Curie point, but the coercive field of this type of formula is high and polarization is difficult. , and it is easy to crack during the polarization process, which limits the large-area application of the formula

[0006] There are also some institutions that use special processes, such as chemical pulverization to increase powder activity, hot pressing, microwave assisted sintering, etc. to promote sintering. The process threshold is high, which is not conducive to large-scale production.

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