Abstract

In order to improve the combustion properties of combustible objects, the microcellular combustible objects were fabricated by the supercritical carbon dioxide (SC-CO2) foaming technology. Scanning electron microscope (SEM) and the closed vessel tests were applied to characterize the cell structure and combustion properties of microcellular combustible objects. The results demonstrated that there were numerous micron-scale cells in the microcellular combustible objects fabricated by the SC-CO2 foaming technology, which enhanced the specific surface area. Both the foaming temperature of 90℃ and the foaming time of 15min led to the increase of the cell density and diameter. The closed vessel tests indicated that the microcellular combustible objects performed the shorter burning time (14.66 ms) than that of original sample (16.49 ms), and the decrement was 11%. The higher foaming temperature, the longer foaming time and the higher RDX mass fraction promoted the spread rate of burning gas of the microcellular combustible objects in burning process because of the higher specific surface area and oxygen balance. Therefore, the microcellular combustible objects foamed by SC-CO2 had a very good application foreground in weapons.

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