Fabrication and properties of a high porosity h-BN-SiO2 ceramics fabricated by stereolithography-based 3D printing

In this paper, BN-SiO2 porous ceramics with high porosity have been successfully fabricated using bottom-up digital light processing (DLP) stereolithography and pressureless sintering. The phase composition, microstructure, compressive strength, dielectric properties and porosity of the porous material were investigated. The results show that the skeleton of the porous material was composed of h-BN, and the silica was 'coated' on the surface of the h-BN particles. The dielectric constant, dielectric loss, compressive strength and porosity of the material were 1.41-1.45, 1.85 x 10 (3)- 1 .93 x 10 (3), 11.2 MPa, 77.2%, respectively. These characteristics make the h-BN-SiO2 porous ceramics useful in wave-transmitting field. (C) 2018 Elsevier B.V. All rights reserved.