Double-layer coated nano-sized boron powder by THV and GAP to promote its ignition and combustion

Boron (B) powder is a promising fuel for propellants due to its high gravimetric and volumetric energy densities. However, its surface oxide layer (B 2 O 3 ), with a low melting point and high boiling point, tends to form a protective coating during combustion, leading to particle agglomeration and reduced combustion efficiency. To address this, the tetrafluoroethylene hexafluoropropylene vinylidene@glycidyl azide polymer@B (THV@GAP@B) composite was prepared via a recrystallization method. Various characterization methods were employed to study the effects of THV and GAP on the ignition and combustion to reduce B agglomeration and improve its combustion efficiency. The two additives exhibit distinct effects in lowering the initial oxidation temperature, enhancing reaction heat, and suppressing agglomeration. When THV and GAP contents are comparable, the modified B exhibits the highest heat release and combustion intensity, outperforming unmodified and singly modified samples. This study offers a foundation for applying fluoropolymers and energetic binders in B-based propellants.