Abstract To improve the interface incompatibility, poor corrosion resistance, and limited combustion efficiency of aluminum powder for propellant applications. The surface of the naked aluminum was coated with a layer of dense nickel of about 100 nm by replacement method. A polydopamine film was then deposited by self-polymerization. The double-layer structure and chemical composition were investigated. The polydopamine content of composite particles was 2.3% by thermal analysis. And its heat release around 1050 °C reached 4137 J g−1, which was much higher than that of aluminum of 1644 J g−1. The surface energies was used to calculate the theoretical adhesion work of aluminum and composite particles to propellant binder. The adhesion work after modification was increased from 62.33 mN m−1 to 74.89 mN m−1. No matter in the weak acid/alkaline or neutral environment, the composite particles exhibited excellent stability at 50 °C. In addition, the combustion test revealed that the composite particles had higher combustion efficiency, smaller condensed phase product size, and stronger ignition ability. All the conclusions indicate after modification by nickel and dopamine, the comprehensive performance of aluminum is improved, and it may be used as an energy component in propellants or other energetic fields.

中文翻译：

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通过对镍和多巴胺的改性提高铝粉的界面附着力、耐腐蚀性和燃烧性能

摘要 为改善推进剂用铝粉界面不相容性、耐腐蚀性能差、燃烧效率有限等问题。裸铝表面通过置换法镀上一层约100nm的致密镍层。然后通过自聚合沉积聚多巴胺膜。研究了双层结构和化学成分。通过热分析，复合颗粒的聚多巴胺含量为2.3%。并且它在1050°C左右的放热量达到了4137 J g-1，远高于铝的1644 J g-1。表面能用于计算铝和复合颗粒对推进剂粘合剂的理论粘附功。改性后的粘附功从 62.33 mN m-1 增加到 74.89 mN m-1。无论在弱酸/碱或中性环境中，复合颗粒在50℃下都表现出优异的稳定性。此外，燃烧试验表明复合颗粒具有更高的燃烧效率、更小的凝聚相产物尺寸和更强的点火能力。所有结论均表明，经镍和多巴胺改性后，铝的综合性能得到提高，可作为推进剂或其他含能领域的能源成分。