Aluminum Combustion in Nitrogen

摘要

The process of nitration of aluminum and aluminum-containing mixtures in the regime of self-propagating high-temprature synthesis wiht a high pressure (up to 300 MPa) of the reacting gas (nitrogen) is considered.The dependences of ignition tempratures and also burning temratures and burning rates of these initial mixtures on test conditions (nitrogen pressure and composition of th initial mixture) are studied.The dependence of the burning rate of initial mixtures on factors affecting spreading of the liquid component (melt containing aluminum and nitrogen) over the surface of the second component (aluminum nitride or titanium diboride),such as the equilibrium wetting angle,interaction at the interface,and melting of the secon component,is studied.The microstructure and some properties of materials obtained are examined.Based on these studies,the combustion mechanism is determined,a mechanism of phase formartion in combustion of these mixtures is suggested,and the structure of the combustion wave is determined.