BN interphases were synthesized by chemical vapour infiltration (CVI) from BCl₃ and NH₃ at 900 °C and 1200 °C within preforms made of a single 2D woven SiC fibre ply. Then CVI of a SiC matrix followed by molten silicon infiltration resulted in laboratory-made single-ply SiC/SiC-Si composites representative of similar industrial ceramic matrix composites. The interphases and interfaces were characterized by transmission electron microscopy. It has been found that, in the two cases, the interphases are mostly turbostratic BN. Those synthesized at 900 °C are very poorly crystallized and exhibit a quasi-isotropic microstructure. An equiaxed interlayer is obtained prior to the columnar CVI growth of SiC matrix. Interphases synthesized at 1200 °C exhibit high degrees of crystallization and structural anisotropy. The SiC matrix grows directly in columns on BN. For interphase thicknesses of 300 nm and more, triangular-shaped crystallites of rhombohedral BN appear in turbostratic BN and the columnar growth of SiC is disoriented.

通过化学气相渗透（CVI）从BCl ₃和NH ₃合成BN相由单个2D编织SiC纤维层制成的预成型坯中在900°C和1200°C下的温度。然后，SiC基体的CVI，然后熔融硅渗透，得到了代表相似工业陶瓷基体复合材料的实验室制造的单层SiC / SiC-Si复合材料。相相和界面通过透射电子显微镜表征。已经发现，在两种情况下，相间大部分是涡轮层BN。在900°C下合成的那些结晶非常差，并表现出准各向同性的微观结构。在SiC基体的柱状CVI生长之前，获得了等轴中间层。在1200°C合成的中间相表现出高度的结晶度和结构各向异性。SiC基质直接在BN上的列中生长。对于300 nm及以上的相间厚度，