Boron Type Delay

Some boron-based delay compositions (B-CuO, B-Pb3O4, B-BaCrO4) are studied in this paper, especially the B-CuO delay composition. The mainly work has: the relation of boron contents and the average liner burning rate, through which chooseing suitable boron contents in these delay compositions; the iMPact of different particle diameters on delay characteristics, by the means of granularity classfication; the iMPact on delay characteristics through pre-treatment to the raw materials and improvement of mixing means ; and some other factors, such as the pressure of charge, loaded times, the charge mass of delay composition; at last ,the mechanical intensities of boron based delay compositions with some different binders. Through the tests, some useful conclusions are as follows:(1) B-Pb3O4 is short delay time composition; B-CuO is short or midden delay timecompositions; and B-BaCrO4 is midden or long delay compositions.(2) To B-CuO delay composition, the smaller particle size, the lower average linear burning rate, the better delay precision , and the higher mechanical intensities.(3) To B-CuO delay composition, after pre-disposal to the raw materials and improvement of the mixing means, the compositon is more active, and the burning rate is higher, the delay precision is better.(4) With suitable binders, boron based delay compositions have better mechanical intensities.