Study on the Effects and Mechanism of Action of Tungsten/Calcium Fluoride System on the Combustion Characteristics of Delay Composition

ABSTRACT This study aims to enhance the combustion reproducibility and stability of tungsten‐based delay compositions, focusing on a basic formula with the composition W/BaCrO 4 /KClO 4 (38%/52%/10%). Relevant experiments were conducted to analyze the combustion characteristics by adding calcium fluoride (CaF 2 ) to the composition. Seven tungsten‐based delay compositions with varying calcium fluoride concentrations were prepared to examine the effects of this additive on combustion characteristics. In the experiment, the combustion rate was first tested, and the formula exhibiting the best combustion reproducibility and stability was selected. The microstructure of the optimal formulation sample was observed using scanning electron microscopy with energy dispersive spectroscopy, and the combustion product composition was analyzed with an x‐ray diffractometer; Thermal analysis was performed on all formulations to investigate their thermal behavior. The experimental results indicated that a calcium fluoride content of 16% yielded the optimal combustion reproducibility and stability. Different formulations offered a wider adjustable range for combustion speed. This study provides both theoretical and experimental insights for regulating the delay time range of delay compositions.