美国宾夕法尼亚州立大学团队Benjamin J. Lear报道了苯三乙氧基硅烷偶联剂涂层铝粉的合成参数，及其对粉末流动性能的影响。相关研究成果于2024年1月24日发表在国际顶尖学术期刊《颗粒学报》。

尽管铝粉的硅烷化目前用于改善其流动性能，用作替代燃料源，但该过程的实验参数范围很广，并非所有参数都得到了彻底的探索。在完成之前，还不知道该过程是否在时间、效率和效果方面进行了优化。

该文中，研究人员研究了湿度、搅拌程度、反应温度和固化时间的变化对苯基三乙氧基硅烷沉积到20μm（d50）铝颗粒上的影响。研究人员通过漫反射红外光谱和x射线光电子能谱证实了涂层的沉积。然后，使用表观密度测量和卡尼流动方法对涂层颗粒进行表征。

通过方差分析发现，在所探索的参数中，只有固化时间和反应温度的变化才能对表观密度产生有意义的变化，而其它任何参数都不会对卡尼流量值产生静态显著变化。因此得出结论，当优化铝颗粒的硅烷化时，不需要对湿度进行环境控制，并且反应可以在最小的搅拌下进行。在很大程度上忽略这些参数的能力有利于大规模处理。

附：英文原文

Title: Analysis of synthetic parameters for coating aluminum powders with phenyltriethoxysilane coupling agent and their effects on powder flow behavior

Author: Lillian M. Mawby , Bellamarie Ludwig, Benjamin J. Lear

Issue&Volume: 2024/01/24

Abstract: Though silanization of aluminum powder is currently used to improve its flow properties, for use as an alternative fuel source, there are a wide range of experimental parameters for the process and not all of them have been thoroughly explored. Until this is complete, it is unknown if the process is optimized in terms of time, efficiency, and effect. Herein, we report on a study into the effects of changes in humidity, degree of agitation, reaction temperature, and curing time upon the deposition of phenyl triethoxysilane into 20 μm (d50) aluminum particles. We confirm the deposition of the coating via diffuse reflectance infrared spectroscopy and x-ray photoelectron spectroscopy. We then characterize the coated particles using apparent density measurements and Carney flow methods. Using analysis of variance, we find that, of the parameters explored, only changes in cure time and reaction temperature provide meaningful changes to the apparent density, while none of our parameters produced statically significant changes in Carney flow values. Thus, we conclude that, when optimizing silanization of aluminum particles, environmental control of humidity is unneeded and that the reaction can be run with minimal agitation. The ability to largely ignore these parameters is a benefit to large-scale processing.

DOI: 10.1016/j.partic.2024.01.008

Source: https://www.sciencedirect.com/science/article/abs/pii/S1674200124000142