Preparation method of leadless piezoelectric ceramic material

The invention belongs to the technical field of leadless piezoelectric ceramic materials and preparation methods thereof, and particularly relates to a preparation method of a leadless piezoelectric ceramic material. The invention aims to provide an economical, effective and lead-pollution-free method for preparing potassium-sodium niobate (KNN) piezoelectric ceramic. A KNN-xCZ ceramic is preparedby a solid-phase synthesis process, and is pre-sintered, crushed and ball-milled, so the grain size distribution becomes uniform, and the density is increased; CaZrO3 is introduced to achieve Tc andT0-T movement in the low-temperature direction, the O-T phase coexistence near the room temperature and relaxation degree increasing, and when x is equal to 0.03, the following optimal electrical properties are realized: the piezoelectric constant d33 is equal to 442 pC/N, and the Curie temperature Tc is 245 DEG C. The method mainly benefits from the fact that the components have O-T coexisting PPB, domain wall movement an