The Research On Modified High-Energy And High-Strength TEGN Propellant

In order to achieve the purpose of high-energy and high-strength, TEGN propellant were modified by adding hexogeon (RDX) and thermoplastic polyurethane elastomer (TPUE) on the traditional formula to improve the mechanical properties and energy performances of gun propellant. Propellant samples had been prepared in different and adding method, nitrogen content of nitrocellulose (NC), RDX particle size. and combustion characteristics of the TEGN gun propellant were analyzed by closed-bomb, semi-hermetic bomb and impact strength test. The thermal decompose characteristics was analyzed by differential scanning calorimetry (DSC).The results shows that propellant has better mechanical properties as alcohol/ketone ratio of 1:1 and adding all alcohol first, adding all ketone ten minites later. The mechanical properties of modified TEGN propellant decreased with increasing RDX particle size and nitrogen content of NC. Process conditions and nitrogen content of NC had little effect on the propellant combustion. The particle size of RDX has a great influence on the combustion process of the modified TEGN propellant. The melting and decomposition process occurs mainly in the condensed phase with the RDX particle size of 8.5 μm and 45 μm. As the RDX particle size increased to 90μm, some RDX particles separates from the basic body and decomposes in the gas phase, the propellant burning surface and quality combustion speed increased and the regularity of combustion reduced. The combustion performance of gun propellant was less affected by adding a little TPUE. The thermal decomposition process of high-energy TEGN propellant mainly contains the thermal decompose of basic body which consists of nitrocellulose, nitroglycerine (NG), nitrotriglycol and the thermal decompose of RDX.