Combustion products agglomeration of propellant containing boron with fluorinated coatings

摘要

? 2021 The Combustion InstituteBoron powders with Mg were coated with polytrifluorochloroethylene (PCTFE, fluorine content is 52.6 wt) and perfluoropelargonic acid (PFPA, fluorine content is 69.6 wt). They were used to fabricate propellants that were burnt in a reaction chamber designed and fabricated in our lab. Combustion products were studied by Raman spectroscopy, powder agglomeration analysis, electron microscopy, and thermal analysis. Results indicate that surface modification of the initial powder by fluorine-containing components decrease the agglomeration of the combustion products and the strongest effect is for PCTFE. Powders microstructural features and thermal stability of the coatings are discussed as being at the origin of different behavior during combustion of the propellants.