Data for: High-temperature properties and interface evolution of C/SiBCN composites prepared by precursor infiltration and pyrolysis

It is evident that the peaks of N2 (mass: 28) or volatile Si (mass: 28) has been be detected on mass spectra. It can be inferred that the N2 and volatile Si are attributed to the reaction of Si_3 N_4+3C→3SiC+2N_2 and Si_3 N_4→3Si(g)+2N_2. The peak of NH3 (mass: 17) may be due to small amount of transamination reaction between N-H group in the precursor backbone and Si-N linkages. And the peaks of H2O (mass: 18), CO2 (mass: 44), NO2 (mass: 46) appeared, because a small amount of oxygen introduced during the PIP process reacted with the SiBCN matrix.

质谱中可检测到氮气（N₂，质量数28）或挥发性硅（Si，质量数28）的特征峰。据此可推断，上述氮气与挥发性硅源自如下两个反应：Si₃N₄ + 3C → 3SiC + 2N₂，以及Si₃N₄ → 3Si(g) + 2N₂。质量数为17的氨气（NH₃）特征峰，可能源于前驱体骨架中的N-H基团与Si-N键之间发生的微量转氨反应。而质量数分别为18、44、46的水（H₂O）、二氧化碳（CO₂）、二氧化氮（NO₂）特征峰的出现，则是由于聚合物浸渍热解（Polymer Impregnation and Pyrolysis，PIP）过程中引入的微量氧与SiBCN基体发生反应所致。