US 11,938,680 B2
Flexible piezoelectric sensor based on 4D printing and preparation method thereof
Bin Su, Hubei (CN); Hongzhi Wu, Hubei (CN); Chunze Yan, Hubei (CN); and Yusheng Shi, Hubei (CN)
Assigned to HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Hubei (CN)
Filed by HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY, Hubei (CN)
Filed on Sep. 30, 2020, as Appl. No. 17/037,745.
Claims priority of application No. 202010158697.0 (CN), filed on Mar. 9, 2020.
Prior Publication US 2021/0280767 A1, Sep. 9, 2021
Int. Cl. B29C 64/386 (2017.01); B22F 10/18 (2021.01); B22F 10/28 (2021.01); B22F 10/38 (2021.01); B22F 12/30 (2021.01); B29C 64/153 (2017.01); B29C 64/307 (2017.01); B33Y 80/00 (2015.01); H10N 30/30 (2023.01); H10N 30/80 (2023.01); H10N 35/80 (2023.01); B22F 10/12 (2021.01)
CPC B29C 64/386 (2017.08) [B22F 10/18 (2021.01); B22F 10/28 (2021.01); B22F 10/38 (2021.01); B22F 12/30 (2021.01); B29C 64/153 (2017.08); B29C 64/307 (2017.08); B33Y 80/00 (2014.12); H10N 30/302 (2023.02); H10N 30/80 (2023.02); H10N 35/80 (2023.02); B22F 10/12 (2021.01); Y10T 29/42 (2015.01)] 3 Claims
OG exemplary drawing
 
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.