Texture and anisotropy of hot-pressed h-BN matrix composite ceramics with in situ formed YAG

Abstract Textured hexagonal boron nitride (h-BN) matrix composite ceramics were prepared by hot-pressing using different contents of 3Y 2 O 3 −5Al (molar ratio 3:5) as the sintering additive. During hot-pressing, liquid Y Al 5 12 (YAG) phase showing good wettability to h-BN grains was in situ formed through reaction between and , a coherent relationship YAG observed with $${\left[ {010} \right]_{{\rm{h}} - {\rm{BN}}}}{\rm{//}}{\left[ {111} \right]_{{\rm{YAG}}}}$$ [ 010 ] h − BN // 111 YAG (002) //(321) . In environment during plate-like rotated under uniaxial pressure preferentially oriented their basal surfaces perpendicular direction, forming textured microstructures c -axis parallel which give these anisotropy mechanical thermal properties. The highest texture degree found specimen 30 wt% YAG, also possesses conductivity. aggregation 40 resulted buckling plates significantly reduced degree.