合成了硼吖嗪和全氢聚硅氮烷的混杂先驱体并对其结构进行了表征;以混杂先驱体和3D炭纤维编制体为原料,采用先驱体浸渍-裂解(PIP)工艺制得了炭纤维增强氮化物基体的复合材料,并对复合材料基体的抗氧化性以及抗烧蚀性能进行了研究.结果表明:混杂先驱体中含有B-N、B-H、Si-N、Si-H、N-H等结构,无其他杂质;基体材料在空气中具有优良的抗氧化性能,温度升至1000℃时仍未发生明显的质量变化,明显优于C/C复合材料;四个PIP工艺循环所制得的复合材料烧蚀表面平整,氮化物基体比增强炭纤维具有更好的耐烧蚀性能.
A hybrid precursor containing borazine and perhydropolysilazane was synthesized and characterized,and used to produce three-dimensional carbon fiber reinforced nitride matrix composites (3D C_f /Nitrides) through vacuum infiltration of the precursor followed by pyrolysis under inert atmosphere.The oxidation resistance and ablation behavior of the C_f/Nitrides were studied.Results showed that there were several bonds such as B-N,B-H,Si-N,Si-H and N-H in the hybrid precursor and the as-formed matrix had a good oxidation resistance.The matrix weight did not change distinctly when the temperature was increased from room temperature to 1 000 ℃.The surface of the ablated composites was flat and the nitride matrix had a much better ablation resistance than did the carbon fibers.
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