Advances in crack formation mechanism and inhibition strategy for ceramic additive manufacturing

Crack formation is a common problem in ceramic additive manufacturing (CAM) process. In this paper, the forming characteristics of indirect ceramic additive manufacturing (DCAM) and direct ceramic additive manufacturing (IDCAM) technologies are comprehensively compared. The morphology and spatial distribution characteristics of micro and macro cracks in CAM are summarized. The crack formation mechanisms in different process stages of IDCAM, such as forming, sintering and cooling are analyzed and in DCAM are mainly discussed from the perspectives of stress distribution and energy release. The crack inhibition methods, including process parameters, auxiliary energy fields and material components are summarized comprehensively. The challenges and possible future trends of crack research in CAM are proposed.