Effects of raw h-BN particle size from 0.5 μm to 11 μm on the phase compositions, texture degree, bending strength, fracture toughness and thermal conductivity of hot-press sintered h-BN-MAS composite ceramics were investigated. Larger h-BN grain can facilitate the nanocrystallization of MAS phase due to the inhibiting crystallization effect of h-BN on α-cordierite. Texture degree of h-BN-MAS composite ceramics increased significantly with increasing raw h-BN particle size, and the 11.0μmBN-MAS composite ceramic shows typical textured structure. The h-BN-MAS composite ceramics show anisotropy in mechanical properties and thermal conductivity, and the anisotropy increased significantly with increasing raw h-BN particle size. The 0.5μmBN-MAS sample shows excellent mechanical properties, and the 10μmBN-MAS sample shows strong anisotropy in thermal conductivity.

研究了0.5〜11μm的h -BN原始粒径对热压烧结h -BN-MAS复合陶瓷的相组成，织构度，弯曲强度，断裂韧性和导热系数的影响。由于h -BN对α-堇青石的抑制结晶作用，较大的h -BN晶粒可以促进MAS相的纳米结晶。h -BN-MAS复合陶瓷的织构度随原始h -BN粒径的增加而显着增加，且11.0μmBN-MAS复合陶瓷表现出典型的织构结构。该^ h-BN-MAS复合陶瓷在机械性能和导热性上表现出各向异性，并且随着原始h -BN粒径的增加，各向异性显着增加。0.5μmBN-MAS样品显示出优异的机械性能，而10μmBN-MAS样品显示出很强的各向异性。