Analysis of Burning Rate Variation of Tungsten Delay Composition Close to Zero Oxygen Balance

Abstract

Tungsten delay compositions are widely utilized in ammunition, small detonators, and other devices. In this study, we first explored the changes in the burning rate of micron-sized tungsten delay compositions (W/BaCrO₄/KClO₄) when achieving zero oxygen balance under different material tube walls. Subsequently, SiO₂, CuO, BN, and shellac were added to the tungsten delay composition to investigate the burning rate variations of different samples in aluminum tubes. The experimental results reveal that the combustion rate of the tungsten delay composition decreases with an increase in the thermal conductivity of the tube wall. The content of BN exhibits a linear relationship with the combustion rate of the tungsten delay composition, the combustion rate of the tungsten delay composition decreases with the increase of the mass percentage of BN. A small amount of SiO₂, CuO, and shellac accelerates the combustion rate of the tungsten delay composition, but the combustion rate decreases as the content of these additives increases. The conclusion of this study can provide a wider range of delay times for delay devices with significant spatial limitations.