US 12,396,365 B2
Method of manufacturing flexible large-area piezoelectric composite materials
In Tae Seo, Gwangju-si (KR); Hyung Won Kang, Seoul (KR); and Seung Ho Han, Gwacheon-si (KR)
Assigned to Korea Electronics Technology Institute, Seongnam-si (KR)
Filed by KOREA ELECTRONICS TECHNOLOGY INSTITUTE, Seongnam-si (KR)
Filed on May 9, 2022, as Appl. No. 17/739,287.
Claims priority of application No. 10-2021-0072198 (KR), filed on Jun. 3, 2021.
Prior Publication US 2022/0393099 A1, Dec. 8, 2022
Int. Cl. H10N 30/85 (2023.01); C08J 3/21 (2006.01); C08J 5/12 (2006.01); C08J 5/18 (2006.01); C08K 3/22 (2006.01); C08K 5/12 (2006.01); H10N 30/088 (2023.01); H10N 30/092 (2023.01); H10N 30/853 (2023.01); H10N 30/857 (2023.01)
CPC H10N 30/092 (2023.02) [C08J 3/212 (2013.01); C08J 5/121 (2013.01); C08J 5/18 (2013.01); C08K 3/22 (2013.01); C08K 5/12 (2013.01); H10N 30/088 (2023.02); H10N 30/852 (2023.02); H10N 30/853 (2023.02); H10N 30/857 (2023.02); C08J 2329/14 (2013.01); C08K 2003/2244 (2013.01); C08K 2201/001 (2013.01); C08K 2201/005 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method of manufacturing a piezoelectric composite material, the method comprising:
wet mixing a ceramic powder, a polymer binder, a plasticizer, and a solvent for 4 to 72 hours to produce a mixed slurry, wherein the amount of the polymer binder in the mixed slurry is 3 to 10 parts by weight, the amount of the plasticizer is 0.1 to 3 parts by weight, and the amount of the solvent is 30 or more to less than 50 parts by weight, based on 100 parts by weight of the ceramic powder in the mixed slurry;
introducing the mixed slurry into a tape casting process to produce a piezoelectric composite sheet;
drying and molding the piezoelectric composite sheet through a roll-to-roll process to produce a molded piezoelectric composite sheet;
laminating and compressing the molded piezoelectric composite sheet to produce a piezoelectric composite sheet laminate; and
cutting the piezoelectric composite sheet laminate into a part having the desired shape and size,
wherein the wet mixing further comprises a stirring and milling, wherein the stirring is a step of producing a mixture in which the polymer binder, the plasticizer, and the solvent are mixed, and the milling is a step of pulverizing the ceramic powder and mixing it with the mixture to produce the mixed slurry, wherein the stirring comprises a first stirring step for 1 to 3 hours at 1200 to 1400 rpm and a second stirring step for 10 to 15 hours at 450 to 550 rpm, and the milling comprises a first milling step for 10 minutes to 1 hour at 1200 to 1800 rpm and a second milling step for 1 hour to 2 hours at 1800 to 2500 rpm.