Lead zirconate titanate piezoelectric ceramic and preparation method thereof

Abstract

The invention discloses a lead zirconate titanate piezoelectric ceramic. The lead zirconate titanate piezoelectric ceramic is prepared from the following raw materials in parts by weight: 55 to 75 parts of lead tetroxide, 0 to 6 parts of barium sulfate, 0.2 to 8 parts of strontium carbonate, 0.1 to 0.9 part of niobium pentoxide, 0.2 to 1 part of antimony pentoxide, 15 to 25 parts of zirconium dioxide and 8 to 15 parts of titanium dioxide. According to the lead zirconate titanate piezoelectric ceramic disclosed by the invention, an excellent lead zirconate titanate piezoelectric ceramic material is prepared by adopting a two-step sintering solid-phase synthesis preparation method, so that the high-temperature sintering time is effectively shortened, and the energy, the time and the production cost are saved to a certain extent. According to the two-step sintering method, by controlling the temperature change, grain boundary migration can be restrained, grain boundary diffusion can be kept in an active state, and therefore the purpose of completing sintering on the premise that grains do not grow up is achieved.

Description

Technical field [0001] The invention relates to the technical field of piezoelectric materials, in particular to a lead zirconate titanate piezoelectric ceramic and a preparation method thereof. Background technique [0002] Piezoelectric ceramic material is a kind of functional ceramic material that can realize the mutual conversion of mechanical energy and electric energy. Because of its stable mechanical properties, excellent electrical properties, simple preparation process, and low cost, it is widely cited in laser, medical, and military information. And aviation. Following the discovery of BaTiO3 piezoelectric ceramics in the Second World War, the lead zirconate titanate (PZT) system was discovered in the early 1950s. So far, PZT piezoelectric ceramics are the most widely used and best-performing piezoelectric ceramic materials. [0003] Although lead zirconate titanate piezoelectric ceramics have better electrical properties, their shortcomings such as low Curie temperature...

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Problems solved by technology

[0003] Although lead zirconate titanate piezoelectric ceramics have good electrical properties, many scholars have been troubled by its low Curie temperature point, high sintering temperature and volatilization of toxic element lead at high temperature.

Sintering temperature, holding time, heating rate and annealing process all directly affect the structure and densification of ceramics, especially the secondary growth of grains that tends to occur in the later stage of sintering often leads to deterioration of ceramic properties

[0005] Some researchers have proposed a two-step sintering method, that is, the ceramic body is heated to a higher temperature to obtain a certain density, and then rapidly cooled to a lower temperature and kept for a long time. At this temperature, the grain boundary diffusion can continue, but Grain boundary migration is suppressed

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