ZrB₂/SiBCN composites containing carbon fibers coated with BN were prepared using combination of sol-gel and spark plasma sintering (SPS) techniques. Thermal shock and ablation behavior of these composites were thoroughly analyzed. Sintered composites contained ZrB₂, SiC and BN(C) crystalline phases. Thin BN layer passivated carbon fibers and prevented them from reacting with the matrix. With the addition of carbon fiber, diffusion coefficient decreased, and the thermal expansion coefficient increased in comparison to ZrB₂/SiBCN composites without carbon fibers. Ablation tests showed no crack formation after carbon fibers were added to the composites. Ablation center exhibited loose and porous network structure. ZrSiO₄ formed from ZrO₂ and SiO₂ reaction in the central ablation region. Presence of ZrSiO₄ prevented samples from further ablation-related damages.

结合溶胶-凝胶和火花等离子体烧结（SPS）技术制备了含碳纤维被BN包覆的ZrB ₂ / SiBCN复合材料。彻底分析了这些复合材料的热冲击和烧蚀行为。烧结的复合材料包含ZrB ₂，SiC和BN（C）晶相。薄的BN层钝化了碳纤维，并防止碳纤维与基体发生反应。与不含碳纤维的ZrB ₂ / SiBCN复合材料相比，添加碳纤维可降低扩散系数，并提高热膨胀系数。烧蚀测试表明，将碳纤维添加到复合材料后，没有裂纹形成。消融中心显示出疏松和多孔的网络结构。氧化锆₄在中央烧蚀区域中由ZrO ₂和SiO ₂反应形成。ZrSiO _4的存在可防止样品受到与烧蚀有关的进一步损害。