Preparation of Gradient Porous TiAl Intermetallics with additive manufacturing technology

Gradient pore size porous material is a kind of porous material with asymmetric pore structure, the gradient character could ensure the smaller pore size on the basis of guarantee the larger filtration flux and other homogeneous structure. Therefore, it is of great significance to develop a novel porous material with gradient pore size. In this study, porous TiAl intermetallics support was prepared by solid partial diffusion activation reaction sintering, and then the gradient membrane was coated by additive manufacturing technology. The pore structures were characterized by pore size test. The results revealed that the matrix prepared with elemental powder of 47~74 µm has good match with of 23-25 µm coating material. The matching rule between the maximum pore size of the substrate and the particle size of the membrane was also investigated. This study has practical significance for the preparation of gradient porous materials by additive manufacturing.