Investigation of the Burning Properties of Slow-Propagation Tungsten Type Delay Compositions

摘要

Twenty-eight delay compositions with a variation of the W content of ± 20% wt, on the basis of the primitive formula, W/ BaCrO4/KClO4/SiO2/Viton=27:54:11:6:2, were designed for delay ignition in self-destruction application of fuse. They were processed finally to be cylindrical pellets and were then characterized by measuring their burning properties including igniting ability, burning rate, and output flame temperature. In the experiments, the cylindrical pellets were packed into a heat-resisting quartz tube and were ignited by an electrical-heating wire. A high-speed video camera and a digital-image processing device were used for simultaneously recording the combustion phenomena such as ignition and flame propagation. In addition, the output flame temperature was detected by placing a thermocouple at the end of the quartz tube. The delay compositions were also loaded in a cylindrical aluminum tube to measure burning properties as compared to naked cylindrical pellets. According to these experimental results, this work discussed the effect of composition on burning properties. The consequences of these analyses will be very important and useful for defining criteria in formulating the tungsten type slow-propagation delay compositions, as well as for improving self-destruction designs of fuse.