US 11,945,754 B2
Direct 4D printing gradient structure ceramics
Jian Lu, Hong Kong (HK); Lei Wan, Hong Kong (HK); Zhou Chen, Hong Kong (HK); and Zhengyi Mao, Hong Kong (HK)
Assigned to City University of Hong Kong, Hong Kong (HK)
Filed by City University of Hong Kong, Hong Kong (HK)
Filed on Oct. 27, 2021, as Appl. No. 17/512,664.
Prior Publication US 2023/0128778 A1, Apr. 27, 2023
Int. Cl. B33Y 10/00 (2015.01); B28B 1/00 (2006.01); B33Y 70/00 (2020.01); C04B 35/571 (2006.01); C04B 35/626 (2006.01); C04B 35/64 (2006.01)
CPC C04B 35/571 (2013.01) [B28B 1/001 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C04B 35/6269 (2013.01); C04B 35/64 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3232 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/3826 (2013.01); C04B 2235/3865 (2013.01); C04B 2235/3873 (2013.01); C04B 2235/447 (2013.01); C04B 2235/483 (2013.01); C04B 2235/6026 (2013.01); C04B 2235/656 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for forming a gradient structure three-dimensional ceramic article comprising:
printing a first layer of a first material comprising a first fraction of first ceramic particles and a first fraction of a first polymeric ceramic precursor;
printing a second layer at least partially disposed on the first layer of a second material comprising a second fraction of second ceramic particles and a second fraction of a second polymeric ceramic precursor, the first fraction of first ceramic particles being different from the second fraction of second ceramic particles;
heating a composite of the first layer and the second layer at a temperature sufficient to decompose the first and second polymeric ceramic precursors and sinter the composite wherein a difference between the first fraction of first ceramic particles and the second fraction of second ceramic particles creates an interface stress to cause a selected level of deformation of the ceramic article.