hermal Decomposition and Combustion Performances of Zr/EMs (DAP-4, AP, CL-20, HMX).

In order to explore the thermal decomposition and combustion performances of zirconium powder (Zr) with high-energy oxidant composite, the thermal decomposition behavior, combustion heat and ignition combustion process of four kinds of energetic materials (EMs) of AP, CL-20, HMX, DAP-4 and Zr/EMs samples were compared and analyzed by using differential scanning calorimetry, automatic calorimetry and self-built combustion experimental system. Some combustion products were collected and characterized. The combustion mechanism of Zr/DAP-4 was analyzed. Results show that the thermal stability and combustion heat release of DAP-4 are better than that of the other three EMs samples. The addition of Zr leads to a higher combustion heat and a lower fa value of the sample, the thermal decomposition temperature remains at 373.8°C, and the combustion performance is better than that of pure DAP-4. Compared with the thermal decomposition of Zr/CL-20 and Zr/ HMX, Zr/DAP-4 has a higher initial decomposition temperature and peak temperature, a lower apparent activation energy fa (138. 7 kj/mol), and a higher combustion heat (17 134J/g). The entire combustion time of Zr/DAP-4 composite is only 170ms, indicating a rapid and intense combustion reaction and its flame intensity is also superior to the other three samples. The combustion products of Zr/DAP-4 include solid products such as ZrO2 and gas products such as H2O and HCI. Zr/DAP-4 composite energetic material has higher energy characteristics and better combustion performances, which make it has great potential for application in the formulation design of propellants. [ABSTRACT FROM AUTHOR]