Preparation method for piezoelectric composite material, and application thereof
Provided are a preparation method of a piezoelectric composite material, and the application thereof. The preparation method includes: step 1, designing a curved-surface 3D printed mesh mold and forming the curved-surface 3D printed mesh mold by printing; step 2, cutting a blocky piezoelectric phase into a plurality of small piezoelectric columns; step 3, inserting the small piezoelectric columns into empty cells of the 3D printed mold; step 4, filling gaps between the piezoelectric columns and the 3D printed mold with a non-piezoelectric phase such as an epoxy resin, and curing and forming the non-piezoelectric phase; and step 5, grinding, polishing, and ultrasonically cleaning a prepared sample, and then performing an electrode coating operation on the sample to obtain a curved-surface piezoelectric composite material.
1 . 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.
2 . The preparation method of the piezoelectric composite material according to claim 1 , wherein each of the plurality of piezoelectric material columns obtained in the step S2 has a square cross section.
3 . The preparation method of the piezoelectric composite material according to claim 1 , wherein in the step S3, the resin mold is of a type with a flat surface or of a type with a curved surface, wherein the curved surface is an arc surface, a spherical surface, an ellipsoidal surface, or any irregular curved surface.
4 . The preparation method of the piezoelectric composite material according to claim 1 , wherein in the step S3, a resin used for preparing the 3D printed resin mold is a photosensitive resin or a thermosensitive resin.
5 . The preparation method of the piezoelectric composite material according to claim 1 , wherein in the step S3, the resin mold has a printing precision smaller than or equal to 0.25 mm.
6 . The preparation method of the piezoelectric composite material according to claim 1 , wherein in the step S5, the resin material to be poured is stirred in vacuum before being poured.
7 . The preparation method of the piezoelectric composite material according to claim 1 , wherein in the step S5, the resin material, when being poured, is poured from a same position into the combinant formed by the mold and the plurality of piezoelectric material columns.