Patent ID: 11858200
Assignee: CITY UNIVERSITY OF HONG KONG
Field: Other special machines (Mechanical engineering)
Classification: CPC B  C | IPC B

Claim 0:
1. A method of in situ 4D printing of high-temperature materials, the method comprising:
3D printing a structure of a material comprising an ink including a precursor;
treating the structure with oxygen, ozone, UV with oxygen, or UV with ozone to create a heterogeneous precursor,
wherein a treated portion of heterogeneous precursor has a different coefficient of thermal expansion or a different thermal shrinkage ratio from a remaining portion of the heterogeneous precursor;
heating the heterogeneous precursor wherein a difference in the coefficient of thermal expansion or the thermal shrinkage ratio between the treated portion of the heterogeneous precursor and a remaining portion of the heterogeneous precursor creates an interface stress to cause a selected level of deformation.