The mechanical properties, thermal shock resistance, and ablation resistance of nano ZrB₂ modified Si₂BC₃N ceramics were investigated. The results show that ZrB₂ stimulated microstructure evolution obviously. Therefore, the maximum strength and fracture toughness reach 559.6 MPa and 6.77 MPa·m^1/2, which are improved by 61.0% and 29.4%, respectively. Furthermore, the residual strengths of 10 wt% ZrB₂ containing composites tested at 1000 ℃ retain 363.6 MPa, which is much higher than 97.7 MPa of pristine Si₂BC₃N ceramics. Besides, the ablation resistance of ZrB₂ modified Si₂BC₃N ceramics at 3000 ℃ is enhanced remarkably and the linear and mass ablation rates of ZrB₂-10 are only 0.009 mm/s and 1.91 mg/s, respectively. The ablation in the ultra-high temperature zone is totally dominated by the ZrB₂ component, and the thermochemical erosion is determined by the oxidation resistance of ZrB₂ in the thermal affected zone.

研究了纳米ZrB ₂改性Si ₂ BC ₃ N陶瓷的力学性能，抗热震性和耐烧蚀性。结果表明，ZrB ₂明显刺激了组织的演变。因此，最大强度和断裂韧性分别达到559.6 MPa和6.77 MPa·m ^1/2，分别提高了61.0％和29.4％。此外，在1000℃下测试的含10 wt％ZrB ₂的复合材料的残余强度保持363.6 MPa，远高于原始Si ₂ BC ₃ N陶瓷的97.7 MPa 。此外，ZrB ₂改性的Si ₂ BC的耐烧蚀性3000℃下的₃ N陶瓷显着增强，ZrB ₂ -10的线性和质量烧蚀速率分别仅为0.009 mm / s和1.91 mg / s。超高温区的烧蚀完全由ZrB ₂组分控制，热化学侵蚀取决于ZrB ₂在热影响区的抗氧化性。