Three-Dimensional Printing of Ti_3SiC_2-Based Ceramics

摘要

In the present work, we explored the feasibility of fabricating Ti_3SiC_2-based ceramics by a near-net-shape fabrication process of three-dimensional printing (3D printing) combined with liquid sih'con infiltration (LSI). The porous ceramic preform was fabricated by 3D printing TiC powder with dextrin as a binder. The heat-treated preforms contained bimodal pore structure with interagglomerate pores (d≈23 urn) and intraagglomerate pores (d≈1 μm). Upon infiltration in Ar atmosphere at 1600°-1700 C for 1 h, silicon melt infiltrated the pores and reacted with TiC to yield Ti_3SiC_2, TiSi_2, and SiC. The effects of silicon content and infiltration temperature on the phase composition of the Ti_3SiC_2-based composites were also studied. After LSI at 1700℃ for 1 h, the composites with an initial TiC:Si mole ratio of 3:1.2 attained a bending strength of 293 MPa, a Vickers hardness of 7.2 GPa, and an electrical resistivity of 27.8 μΩ· cm, respectively.