Investigation of influence NH4VO3+HOCH2CH2OH oxidation of ASD-4 powder
- Mr. Danil ESELEVICH
To improve the characteristics of rocket propellants, high-energy metal powders are used. Aluminum powders are most widely employed metallic combustibles. However, the presence of an oxide film on the surface of particles is a grave disadvantage, which does not allow using their energy potential in full. This work presents results of a study of the oxidation process of Al powder modified ammonia metavanadate and ethylene glycol. The specific surface of Al powder was 0.4 m2/g; active metal - 98.7%; vanadium content - 0.5-0.8%. Carried out a comprehensive study of the modified aluminum powder oxidation by methods TG, DSC, X-ray diffraction using a synchrotron radiation source. The study was conducted in air at a heating rate of 10 deg./min. to 1250 0C. It has been found that the impregnation of micro-powder ASD-4 accelerates it’s oxidation under heat and shifts the process to the low temperature zone, compared with the initial powder Al. Showed the features of oxidation by the formation of intermediate phases of vanadium oxide at low temperatures. The two modifiers have been compared: NH4VO3 + HOCH2CH2OH and studied previously V2O5 ∙ nH2O. The latter has the advantage of the completeness of the final conversion, but for the more active powders is preferable to use ethylene glycol.