Synthesis of self-toughness porous Si_3N_4 ceramics with three-dimensional cage structures

摘要

Self-toughness porous Si3N4 ceramics are prepared by surface modification of Si3N4 particles. The asfabricated porous Si3N4 ceramics have high number of three-dimensional cage structures that can cause the crack deflection, absorb the fracture stress to produce microcrack toughening effect and increase the structural reliability of porous Si3N4 ceramics. The flexural strength is 78.0 MPa. The dielectric constant and dielectric loss is 3.47 and 0.001 respectively. This kind of porous Si3N4 ceramics with special three-dimensional cage structures have high mechanical strength, good antioxidation properties and excellent dielectric properties. (C) 2020 Elsevier B.V. All rights reserved.