6 March 2014 Three-dimensional ceramic molding process based on microstereolithography for the production of piezoelectric energy harvesters
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Proceedings Volume 8970, Laser 3D Manufacturing; 89700H (2014) https://doi.org/10.1117/12.2041822
Event: SPIE LASE, 2014, San Francisco, California, United States
A three-dimensional (3-D) molding process using a master polymer mold produced by microstereolithography has been developed for the production of piezoelectric ceramic elements. In this method, ceramic slurry is injected into a 3-D polymer mold via a centrifugal casting process. The polymer master mold is thermally decomposed so that complex 3-D piezoelectric ceramic elements can be produced. As an example of 3-D piezoelectric ceramic elements, we produced a spiral piezoelectric element that can convert multidirectional loads into a voltage. It was confirmed that a prototype of the spiral piezoelectric element could generate a voltage by applying a load in both parallel and lateral directions in relation to the helical axis. The power output of 123 pW was obtained by applying the maximum load of 2.8N at 2 Hz along the helical axis. In addition, to improve the performance of power generation, we utilized a two-step sintering process to obtain dense piezoelectric elements. As a result, we obtained a sintering body with relative density of 92.8%. Piezoelectric constant d31 of the sintered body attained to -40.0 pC/N. Furthermore we analyzed the open-circuit voltage of the spiral piezoelectric element using COMSOL multiphysics. As a result, it was found that use of patterned electrodes according to the surface potential distribution of the spiral piezoelectric element had a potential to provide high output voltage that was 20 times larger than that of uniform electrodes.
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Shoji Maruo, Shoji Maruo, Kenji Sugiyama, Kenji Sugiyama, Yuya Daicho, Yuya Daicho, Kensaku Monri, Kensaku Monri, } "Three-dimensional ceramic molding process based on microstereolithography for the production of piezoelectric energy harvesters", Proc. SPIE 8970, Laser 3D Manufacturing, 89700H (6 March 2014); doi: 10.1117/12.2041822; https://doi.org/10.1117/12.2041822

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