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采用复合型喷雾造粒工艺对制备态高活性纳米铝粉进行了HTPB-TDI包覆造粒研究,用SEM+EDS、TEM等对包覆造粒结果进行了表征。结果表明,在包覆剂与活性纳米铝粉质量比为1:2和1:5的两种情况下都能实现对高活性纳米铝粉的包覆组装造粒,包覆剂能够高覆盖纳米铝粉表面,且均匀铺展在纳米铝粉表面,厚度分别达到10nm和5nm,能很好阻隔或延缓外界氧与纳米铝粉的反应,有望实现高活性纳米铝粉的长期存储。随着包覆剂含量的减少,在相同的组装工艺条件下,组装造粒颗粒品质随之提高,组装颗粒平均粒径减小,但颗粒球型度随之提高。在1:5的配比下,包覆组装颗粒的活性铝含量超过72%,活性铝含量高,因此,可通过配比和工艺控制进一步提高包覆组装颗粒活性铝含量,实现高活性纳米铝粉在推进剂中的应用。
HTPB-TDI coated granulation was carried out on the as-prepared high activity nano aluminum powder by composite spray granulation process. The coated granulation results were characterized by SEM + EDS, TEM and so on. The results showed that coating and granulation of highly active nano-aluminum powder could be achieved in both cases of 1: 2 and 1: 5 coating mass ratio with active nano-aluminum powder, and the coating agent could cover the nano- Aluminum powder surface, and spread evenly on the surface of nano-aluminum powder thickness of 10nm and 5nm, respectively, can be very good barrier or delay the reaction of oxygen and nano-aluminum powder is expected to achieve long-term storage of high activity nano aluminum powder. With the decrease of the content of the coating agent, the quality of the assembled granulated particles increased with the same assembly process. The average particle size of the assembled particles decreased, but the spherical shape of the particles increased accordingly. Under the ratio of 1: 5, the content of active aluminum in the coated and assembled particles is more than 72% and the content of active aluminum is high. Therefore, the active aluminum content of the coated and assembled particles can be further increased by the ratio and process control, Application of powder in propellants.