用SiC晶须和长柱状β-Si3N4对Si3N4/BN层状材料的基体层和分隔层进行了强化。轧膜工艺对SiC晶须和原料中存在的少量β-Si3N4晶粒有一定的定向作用，而基体层中定向分布的SiC晶须和长柱状的β-Si3N4晶粒对基体层的强韧化作用类似于块体材料，其抗弯强度和断裂韧性的提高幅度都大于50%；分隔层中β-Si3N4的定向度较差，但这有利于形成网状结构，在分隔层中起到骨架的作用，同时还可以增加裂纹的扩展长度，改善分隔层与基体层的界面结合状态。最终得到性能最佳的材料的成分为Si3N4+20wt%SiC晶须（基体层），BN+15vol%β-Si3N4（分隔层），其断裂功可达4820J/m2，抗弯强度仍可保持在650MPa。
The matrix layer and the rod-like β-Si3N4 strengthened the matrix layer and the separating layer of the Si3N4/BN multilayer materials were strengthened using SiC whicker and rod-like β-Si3N4. The rolling process would orient them in the matrix layer, and they can improve the bending strength and toughness by above 50% as well as the effect in the monolithic materials. When they were in the separating layer, the orientation of β-Si3N4 was poor. It would form the net structure, and their effect was similar to the framework. Moreover, they could increase the delaminating crack length and improve the bonding between the separating layer and matrix layer. The materials were obtained,in which the matrix layer component was Si3N4+20wt%SiCw, the separating layer component was BN+15vol%β-Si3N4. The work of fracture could achieve 4820J/m2 with the bending strength retaining 650MPa.
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