Preparation method for piezoelectric composite material, and application thereof

A preparation method of a piezoelectric composite material, comprising:

• step S1, obtaining a piezoelectric material block, and cutting the piezoelectric material block in a first direction, wherein the piezoelectric material block is made of a piezoelectric single crystal material;
• step S2, cutting the piezoelectric material block that has been cut in the step S1 in a second direction to obtain a plurality of piezoelectric material columns independent from each other, wherein the second direction is perpendicular to the first direction;
• step S3, preparing a 3D printed resin mold comprising empty cells;
• step S4, inserting the plurality of piezoelectric material columns obtained by the cutting in the step S2 into the empty cells of the 3D printed resin mold obtained in the step S3, respectively, to obtain a combinant of the 3D printed resin mold and the plurality of piezoelectric material columns, wherein the plurality of piezoelectric material columns obtained by the cutting is screened before being inserted into the 3D printed resin mold obtained in the step S3;
• crack-free single crystal piezoelectric material columns are retained during screening of single crystal piezoelectric material columns, and single crystal piezoelectric material columns having a piezoelectric coefficient falling within a designed range are loaded into a same mold;
• and
• step S5, pouring a resin material into the combinant of the resin mold and the plurality of piezoelectric material columns, curing the resin material, and performing surface grinding and polishing, to form a curved-surface piezoelectric composite material.