Abstract
Ammonium nitrate (AN)-based composite gas generator have attracted a considerable amount of attention because of the clean burning nature of AN as an oxidizer. However, ammonium nitrate-based gas generator has several major problems, namely, poor ignitability, a low burning rate, low energy, and high hygroscopicity. The addition of different transitional metal oxides and MgAl mechanical alloyed proved to be effective in improving the burning characteristics of AN-based gas generator. In this research work, combustion study of different transition metal oxide based on AN/MgAl composites gas generators was studied. Gas generators were combusted at the pressure of 1 MPa, 3 MPa and 5 MPa in the combustion chamber and the burning rates were determined. It was stated that the addition of metal oxides into the composition of the gas generators improves ignition at low pressure and increases the burning rate. The use of the mechanical MgAl alloys as a fuel allowed the ignition of the gas generator at a lower temperature. The method of thermogravimetric/differential thermal analyzer (TG/DTA) was used to investigate the effect of metal oxides addition on the AN/MgAl-based gas generators thermal decomposition characteristics.
Highlights
A composite gas generator is a heterogeneous phase and consists of a synthetic plastic binder matrices made of metals and metal alloys and components crystalline of oxidizers
The increasing of the flammability limit is due to the disadvantages of ammonium nitrate
With a view to reduce these disadvantages, we investigated the mechanisms of combustion by adding the composite transition metal oxide to gas generators on the basis of ammonium nitrate
Summary
A composite gas generator is a heterogeneous phase and consists of a synthetic plastic binder matrices made of metals and metal alloys and components crystalline of oxidizers. They are used as fuel in vehicles, strategic missiles, and engines in technical fields. Ammonium nitrate has several significant shortcomings such as low burning rate, slow flammability, high hygroscopicity and low energy [8] Despite these disadvantages, AN is widely used as an oxidizing agent in the energy fuels. The burning characteristics of with various metal oxides (MeOx – TiO2, Cr2O3, ZrO2) on the AN/MgAl based gas generators were studied
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