Method for preparing BCZT-based leadless piezoelectric ceramics

Abstract

The invention relates to the technical field of preparation of electronic components and devices and particularly relates to a method for preparing BCZT-based leadless piezoelectric ceramics. The method comprises the steps of dissolving citric acid in ethylene glycol, adding anhydrous ethanol diluted butyl titanate to obtain a compounding solution, dropwise adding a barium acetate solution, a calcium nitrate solution and a zirconium nitrate solution into the compounding solution, carrying out uniform mixing so as to obtain a BCZT-based polymer precursor, mixing NdFeB nano-powder with ferrum nano-powder so as to obtain magnetic powder slurry, mixing hard magnetic powder and core-shell structured ferrum / cobalt nano powder, then, carrying out high-speed dispersing treatment, and carrying outmold loading, spark plasma sintering and demolding, thereby obtaining the piezoelectric ceramics. Dense cobalt powder particles can be used for protecting ferrous powder from oxidation, tetrabutyl titanate reacts with citric acid to form a network structure, zirconium-calcium-barium titanate based materials are free of Pb and have little harm to human and environment, elemental cobalt will be slightly softened at high temperature, thus, the binding power of magnetic materials is enhanced, the coefficient of thermal conductivity of the magnetic materials is reduced, the magnetic materials can stably work in high-temperature environments, and the application prospect is broad.

Description

Technical field [0001] The invention relates to the technical field of electronic component preparation, in particular to a preparation method of BCZT-based lead-free piezoelectric ceramics. Background technique [0002] Piezoelectric ceramic is a kind of information functional ceramic material that can convert mechanical energy and electrical energy. In addition to piezoelectricity, piezoelectric ceramics also have dielectric properties, elasticity, etc., and have been widely used in medical imaging, acoustic sensors, acoustic transducers, and ultrasonic motors. [0003] Piezoelectric ceramics make use of their materials to cause the relative displacement of the positive and negative charge centers inside the material under the action of mechanical stress to be polarized, resulting in the opposite signs of bound charges appearing on both ends of the material, that is, piezoelectric effect. It is made with sensitive characteristics. At present, the piezoelectric ceramics produced ...

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Problems solved by technology

[0006] The technical problem mainly solved by the present invention is that most of the current piezoelectric ceramics are PZT-based piezoelectric ceramics, and the Pb content of PZT-based piezoelectric ceramics is as high as 60wt.%, which will be harmful to human health during its preparation, use and disposal. The current Curie temperature of undoped lead zirconate titanate ceramic materials is only 380°C, and the Curie temperature of the system will be further reduced by donor and acceptor ion doping, making it difficult to meet the working environment temperature. Higher than 300 ° C and above, the defect that it cannot work stably in a high temperature environment provides a preparation method of BCZT-based lead-free piezoelectric ceramics

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