Abstract The Al2OC-AlN solid solution reinforced Al–Al2O3 composite material was successfully synthesized by sintering Al–Al2O3 composites with the phenolic resin as binding reagent in air at 1500 °C. The reaction mechanism was investigated by XRD, SEM and thermodynamic analysis. Results showed that the surface layer of the sintered sample was fully oxidized. But Al2OC-AlN solid solution whiskers and particles were observed in the interior layer. In the surface layer, Al and C from resin were oxidized to Al2O3(s) and CO2(g). With the consumption of oxygen, p (O2) gradually decreased from the surface layer to the interior layer. And the oxidation product of Al and C transformed into Al2O(g) and CO(g). When the p (O2) further decreased, the metastable phase AlN was generated in the interior layer. Under the induction of the highly active AlN nucleus, the isostructural Al2OC-AlN solid solution whisker was generated from the gas phase reaction among Al2O(g), CO(g), Al(g) and N2(g). In the region with even lower oxygen partial pressure, particle-like Al2OC-AlN solid solution was generated from the reaction among Al(l), Al2O3(s), C(s) and N2(g).

中文翻译：

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1500℃空气中Al-Al2O3复合材料中Al2OC-AlN固溶体的合成及形成机理研究

摘要 以酚醛树脂为结合剂，在空气中1500 ℃烧结Al-Al2O3复合材料，成功合成了Al2OC-AlN固溶体增强Al-Al2O3复合材料。通过XRD、SEM和热力学分析研究了反应机理。结果表明，烧结样品的表层被完全氧化。但在内层观察到 Al2OC-AlN 固溶体晶须和颗粒。在表层，树脂中的 Al 和 C 被氧化为 Al2O3(s) 和 CO2(g)。随着氧气的消耗，p(O2)从表层到内层逐渐降低。Al和C的氧化产物转化为Al2O(g)和CO(g)。当 p (O2) 进一步降低时，亚稳相 AlN 在中间层产生。在高活性AlN核的诱导下，Al2O(g)、CO(g)、Al(g)和N2(g)之间的气相反应生成了等结构的Al2OC-AlN固溶体晶须。在氧分压更低的区域，Al(l)、Al2O3(s)、C(s)和N2(g)反应生成颗粒状Al2OC-AlN固溶体。