A gravity-driven sintering method to fabricate geometrically complex compact piezoceramics

Yao Shan, Shiyuan Liu, Biao Wang, Ying Hong, Chao Zhang, C. W. Lim, Guangzu Zhang and Zhengbao Yang ()
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Yao Shan: City University of Hong Kong
Shiyuan Liu: City University of Hong Kong
Biao Wang: City University of Hong Kong
Ying Hong: City University of Hong Kong
Chao Zhang: Huazhong University of Science and Technology
C. W. Lim: City University of Hong Kong
Guangzu Zhang: Huazhong University of Science and Technology
Zhengbao Yang: City University of Hong Kong

Nature Communications, 2021, vol. 12, issue 1, 1-7

Abstract: Abstract Highly compact and geometrically complex piezoceramics are required by a variety of electromechanical devices owing to their outstanding piezoelectricity, mechanical stability and extended application scenarios. 3D printing is currently the mainstream technology for fabricating geometrically complex piezoceramic components. However, it is hard to print piezoceramics in a curve shape while also keeping its compactness due to restrictions on the ceramic loading and the viscosity of feedstocks. Here, we report a gravity-driven sintering (GDS) process to directly fabricate curved and compact piezoceramics by exploiting gravitational force and high-temperature viscous behavior of sintering ceramic specimens. The sintered lead zirconate titanate (PZT) ceramics possess curve geometries that can be facilely tuned via the initial mechanical boundary design, and exhibit high piezoelectric properties comparable to those of conventional-sintered compact PZT (d33 = 595 pC/N). In contrast to 3D printing technology, our GDS process is suitable for scale-up production and low-cost production of piezoceramics with diverse curved surfaces. Our GDS strategy is an universal and facile route to fabricate curved piezoceramics and other functional ceramics with no compromise of their functionalities.

Date: 2021
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Citations: View citations in EconPapers (3)

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DOI: 10.1038/s41467-021-26373-x

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