Preparation of highly oriented h-BN based textured ceramics via grain rearrangement under DLP printing and low-pressure sintering

Abstract

Highly textured hexagonal boron nitride (h-BN) matrix ceramics with Al2O3 and Y2O3 as sintered additives were fabricated by digital light processing (DLP) printing and hot-press (HP) sintering. The orientation degree of sintered h-BN-Y3Al5O12 (YAG) ceramic was evaluated by X-ray diffraction and pole figures. Due to the highly textured character, the BN-YAG ceramic shows obvious anisotropic thermal conductivity. By using the rearrangement of crystal grains during photocuring, a textured ceramic having high orientation degree can be prepared under a short holding time and a low sintering pressure.