Engineer Kazem Barati, Engineer Keyvan Nosratzadegane, Engineer Mohammad Ferdosi, Engineer Mohsen Mosadegh, Engineer Benyamin Hosseindoust,
Volume 9, Issue 2 (10-2014)
Abstract
Guanylurea dinitramide is regarded as one of the most important dinitramide salts with low sensitivity and proper efficiency. Dinitramide salts such as Ammonium dinitramide and Guanylurea dinitramide can be used as oxidizing agents inrocket, guns and gas-producing propellant formulations. Besides, the application of these materials with smaller particle size my result in the higher efficiency of the composites due to the increase in their surface amount as well as the correction of the related defects in their crystal structures. In this study, Guanylurea dinitramide was obtained from potassium sulfamate salt (40% yield), and then it was characterized. For the preparation of the particles under 20 microns for use in gun propellants, the solvent/anti-solvent crystallization method was taken in to account. Furthermore, influential factors on the size and shape of the particles (e.g., concentrations, purity of anti-solvent, effect of freezing, and type of drying) were investigated using scanning electron microscopy images, and subsequently some particle size in the range of 20 microns to 300 nm were produced.
Kazem Barati, Keyvan Nosratzadegan, Benjamin Hosseindoost,
Volume 14, Issue 1 (3-2018)
Abstract
Owing to the prime importance of ammonium dinitramide (ADN) as an oxidizer in solid propellants, its synthesis has received a great amount of interest. There have been several new and innovative synthesis routes developed by researcher’s worldwide. Liquid-fuel rockets consist of a fuel and oxygen (or other oxidizer) in liquid state. These fractals are already being combined together or combined in a combustion chamber and ignited them. The fuel flow to the engine can be controlled, the amount of thrust produced can be regulated and the engine can be turned off. Many factors go into choosing a propellant for a liquid propellant rocket engine. The primary factors include ease of operation, cost, hazard, environment and performance. For commercial and military use, hydrazine has been the standard liquid monopropellant since 1960s. Increased environmental awareness and safety issues in handling hydrazine made the propellant community to find other liquid monopropellant alternatives. Over the year’s nontoxic liquid monopropellants based of ADN have been experimented by scientists all over the world. In terms of specific impulse, ADN based monopropellant outperforms hydrazine. This paper reviews the preparation, characterization and functional testing of liquid propellant based ADN is presented.
