Abstract We report on a successful attempt to introduce Al 2 O 3 and AlN nanoparticles in the matrix of a C/C composite via (i) aqueous synthesis of AlOOH nanoparticles in a predensified C/C composite preform, (ii) ceramization of AlOOH into either Al 2 O 3 or AlN, and (iii) final pyrocarbon densification. We show that we were able to synthesize a uniform and thin layer of high aspect ratio (nanoneedle) AlOOH particles at the surface of pyrocarbon coated fibers. This morphology was conserved upon transformation to alumina, however, coalescence into larger compact grains (thus discontinuous) was observed after nitridation. Nevertheless, the ceramic introduction did not alter the microstructure of the resulting composite after full densification. While most of the ceramic/carbon interfaces showed a parallel arrangement of graphene layers at the surface of the ceramic particles, characteristic of weak bonding, a carbon/AlN interface showed a perpendicular arrangement, suggesting strong covalent bonding.

中文翻译：

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AlN和Al 2 O 3 纳米颗粒在预致密化阶段水相生长和陶瓷化的C/C复合材料中的基质夹杂

摘要 我们报告了在 C/C 复合材料的基质中引入 Al 2 O 3 和 AlN 纳米颗粒的成功尝试，通过 (i) 在预致密的 C/C 复合材料预制件中水法合成 AlOOH 纳米颗粒，(ii) 将 AlOOH 陶瓷化为Al 2 O 3 或AlN，以及(iii)最终的热碳致密化。我们表明我们能够在焦炭涂层纤维的表面合成均匀且薄的高纵横比（纳米针）AlOOH 颗粒层。这种形态在转变为氧化铝时保持不变，然而，在氮化后观察到聚结成更大的致密晶粒（因此不连续）。然而，陶瓷的引入并没有改变完全致密化后所得复合材料的微观结构。