Patent ID: 11938680
Assignee: HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY
Field: Materials, metallurgy (Chemistry)
Classification: CPC B  H  Y | IPC B  H

Claim 0:
1. A preparation method of a flexible piezoelectric sensor, the flexible piezoelectric sensor comprises a magnetic part and a conductive part, wherein the conductive part comprises two substrates disposed opposite to each other and a spiral structure disposed between the two substrates, both the two substrates and the spiral structure are formed of conductive metal materials; the magnetic part is a flexible porous structure and arranged between the two substrates to generate a magnetic field; when the two substrates are subjected to external pressure, the spiral structure and the magnetic part are compressed simultaneously, a magnetic flux passing through the spiral structure changes, and a voltage of the two substrates changes, by measuring a voltage change of the two substrates to reflect the change of external pressure, a pressure measuring process is achieved, the method comprising the following steps:
S1 selecting polymer powder and magnetic powder as raw materials, mixing the polymer powder and the magnetic powder to prepare composite powder, calculating and obtaining a compression modulus of the spiral structure in the conductive part, constructing a porous structure of the magnetic part, and calculating and obtaining a compression modulus of the porous structure, forming the porous structure by a 3D printing method, thereby obtaining the required magnetic part; magnetizing the magnetic part so that the magnetic part obtains permanent magnetism;
S2 constructing a three-dimensional structure of the conductive part, and simultaneously constructing the compression modulus of the spiral structure according to the compression modulus of the porous structure, such that a ratio of the compression modulus of the spiral structure of the conductive part to the compression modulus of the porous structure is 0.1 to 10, selecting a raw material of the conductive part, performing a 3D printing method by using the raw material according to the 3D model, thereby obtaining the required conductive part;
S3 assembling the magnetic part with permanent magnetism between the substrates of the conductive part to obtain the required piezoelectric sensor.