Effects of cross-scale h-BN grains and orientation degree on the mechanical and thermal properties of BN-matrix textured ceramics

h-BN is a two-dimensional ceramic material with a lamellar structure, known for its typical orientation char-acteristics on mechanical and thermal properties. By optimizing the size and arrangement of h-BN grains in the matrix, the anisotropic characteristics of h-BN ceramics can be fully utilized to obtain ceramic materials with high thermal conductivity or high strength. In order to study the effect of grain orientation distribution on the mechanical and thermal properties of materials, the index of orientation distribution (IOP) was used to quan-titatively characterize the orientation degree of h-BN grains and analyzed the effect of h-BN grain size on ma-terial properties. The results show when the initial h-BN size is 13.50 mu m, the ceramic has the highest orientation degree/-507, and the mechanical and thermal properties show obvious anisotropy. While the related properties of BN-YAG ceramics varies significantly with the decrease of initial h-BN grain size.

Automated summary

By optimizing the size and arrangement of h-BN grains, ceramic materials with high thermal conductivity or high strength can be obtained by fully utilizing the anisotropic characteristics of h-BN ceramics. The effect of grain orientation distribution on the mechanical and thermal properties of materials was studied using the index of orientation distribution (IOP) to quantitatively characterize the orientation degree of h-BN grains, and the effect of h-BN grain size on material properties was analyzed. The results show that when the initial h-BN size is 13.50 um, the ceramic has the highest orientation degree/-507 and exhibits obvious anisotropy in mechanical and thermal properties. The related properties of BN-YAG ceramics vary significantly with the decrease of initial h-BN grain size.