The effect of tape casting parameters on the properties of textured porous silicon nitride ceramics

Abstract A method of enhancing the mechanical properties of porous silicon nitride ceramics by involving texture structure through tape casting was explored. The influence of grain orientation was systematically studied by varying the sintering temperature, casting speed, and gap height. The results indicate that increasing the sintering temperature and casting speed can improve the degree of grain orientation. The mechanical properties of ceramics are significantly affected by the degree of grain orientation, the sample with the highest Lotgering factor demonstrated a flexural strength of 441 ± 12 MPa and a fracture toughness of 5.6 MPa·m 1/2 at a porosity of 39%. The relative permittivity of ceramics is predominantly governed by the porosity, with the grain orientation exerting a relatively minor effect.