Calcium zirconate and tantalum doped potassium sodium niobate-based piezoelectric ceramic and preparation method and application thereof

Abstract

The invention belongs to the field of preparation of ceramic materials, and particularly relates to calcium zirconate and tantalum doped potassium sodium niobate-based piezoelectric ceramic and a preparation method and application thereof. The high piezoelectric property of the KNN-based piezoelectric ceramic can be greatly improved through the CaZrO3-doped potassium sodium niobate-based ceramic,and the d33 of the CaZrO3-doped KNN-based ceramic at 160 DEG C is greater than or equal to 200Pc/N. Meanwhile, tantalum ions are doped into the CaZrO3-KNN-based ceramic so that the CaZrO3-KNN-based ceramic still keeps good piezoelectric property and temperature stability under the condition that high-density lead-free ceramic is obtained.

Description

technical field [0001] The invention belongs to the field of preparation of ceramic materials, and in particular relates to calcium zirconate and tantalum-doped potassium sodium niobate-based piezoelectric ceramics, a preparation method and application thereof. Background technique [0002] As a class of functional materials, piezoelectric ceramics can realize mutual conversion between electrical energy and mechanical energy. They have very important applications in heat exchangers, sensors, drives, energy recovery and other fields. They have been widely used in medical treatment, industrial manufacturing, transportation, energy, and aviation. Aerospace, information and communication, and public safety and other aspects occupy an important strategic position in the fields of national economy and national defense security. In 2010, the global market of ultrasonic medical diagnosis and industrial non-destructive testing industry reached more than 15 billion US dollars, and the...

AI Technical Summary

Problems solved by technology

However, there are still some problems in the KNN-based ceramics prepared by this design method: although KNN-based ceramics have a relatively high Curie temperature (usually Tc>200°C), since the high-voltage electric energy of this system is established at two or even higher Based on the coexistence of multiple ferroelectric resistors, and the slope of the ferroelectric-ferroelectric phase transition is in a slope state

In addition, they in (K,Na,Li)NbO 3 -BaZrO 3 -(La,Na)TiO 3 The presence of vertical MPB phase boundaries has also been found in ceramics, and its piezoelectric constant can reach 270pC / N. There is no report on the stability of piezoelectric performance, but the vertical quasi-isomorphic phase boundaries in lead-free piezoelectric materials The report provides the possibility to obtain high temperature stable piezoelectric properties

However, the above-mentioned studies are all based on a large number of experiments on the vertical quasi-isomorphic phase boundary, and no systematic and regular construction and design of the vertical quasi-isomorphic phase boundary has been found, which greatly increases the difficulty of the experiment and the Therefore, if we can explore a set of universal rules and methods for constructing a vertical MPB similar to PZT in KNN-based ceramics, it will be possible to obtain a more ideal temperature while ensuring the high-voltage performance of ceramics. Stability characteristics